ca4e7f91c6
when read from cache compact and expire row tombstones remove expired empty rows from cache do not expire range tombstones in this patch Refs #2252, #6033 Closes #12917
1064 lines
50 KiB
C++
1064 lines
50 KiB
C++
/*
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* Copyright (C) 2017-present ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: AGPL-3.0-or-later
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*/
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#pragma once
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#include <vector>
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#include "row_cache.hh"
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#include "mutation/mutation_fragment.hh"
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#include "query-request.hh"
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#include "partition_snapshot_row_cursor.hh"
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#include "mutation/range_tombstone_assembler.hh"
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#include "read_context.hh"
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#include "readers/delegating_v2.hh"
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#include "clustering_key_filter.hh"
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namespace cache {
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extern logging::logger clogger;
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class cache_flat_mutation_reader final : public flat_mutation_reader_v2::impl {
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enum class state {
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before_static_row,
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// Invariants:
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// - position_range(_lower_bound, _upper_bound) covers all not yet emitted positions from current range
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// - if _next_row has valid iterators:
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// - _next_row points to the nearest row in cache >= _lower_bound
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// - _next_row_in_range = _next.position() < _upper_bound
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// - if _next_row doesn't have valid iterators, it has no meaning.
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reading_from_cache,
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// Starts reading from underlying reader.
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// The range to read is position_range(_lower_bound, min(_next_row.position(), _upper_bound)).
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// Invariants:
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// - _next_row_in_range = _next.position() < _upper_bound
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move_to_underlying,
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// Invariants:
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// - Upper bound of the read is *_underlying_upper_bound
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// - _next_row_in_range = _next.position() < _upper_bound
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// - _last_row points at a direct predecessor of the next row which is going to be read.
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// Used for populating continuity.
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// - _population_range_starts_before_all_rows is set accordingly
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// - _underlying is engaged and fast-forwarded
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reading_from_underlying,
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end_of_stream
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};
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partition_snapshot_ptr _snp;
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query::clustering_key_filter_ranges _ck_ranges; // Query schema domain, reversed reads use native order
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query::clustering_row_ranges::const_iterator _ck_ranges_curr; // Query schema domain
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query::clustering_row_ranges::const_iterator _ck_ranges_end; // Query schema domain
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lsa_manager _lsa_manager;
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partition_snapshot_row_weakref _last_row; // Table schema domain
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// Holds the lower bound of a position range which hasn't been processed yet.
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// Only rows with positions < _lower_bound have been emitted, and only
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// range_tombstone_changes with positions <= _lower_bound.
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//
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// Invariant: !_lower_bound.is_clustering_row()
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position_in_partition _lower_bound; // Query schema domain
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// Invariant: !_upper_bound.is_clustering_row()
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position_in_partition_view _upper_bound; // Query schema domain
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std::optional<position_in_partition> _underlying_upper_bound; // Query schema domain
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// cache_flat_mutation_reader may be constructed either
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// with a read_context&, where it knows that the read_context
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// is owned externally, by the caller. In this case
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// _read_context_holder would be disengaged.
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// Or, it could be constructed with a std::unique_ptr<read_context>,
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// in which case it assumes ownership of the read_context
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// and it is now responsible for closing it.
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// In this case, _read_context_holder would be engaged
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// and _read_context will reference its content.
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std::unique_ptr<read_context> _read_context_holder;
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read_context& _read_context;
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partition_snapshot_row_cursor _next_row;
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// Holds the currently active range tombstone of the output mutation fragment stream.
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// While producing the stream, at any given time, _current_tombstone applies to the
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// key range which extends at least to _lower_bound. When consuming subsequent interval,
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// which will advance _lower_bound further, be it from underlying or from cache,
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// a decision is made whether the range tombstone in the next interval is the same as
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// the current one or not. If it is different, then range_tombstone_change is emitted
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// with the old _lower_bound value (start of the next interval).
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tombstone _current_tombstone;
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state _state = state::before_static_row;
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bool _next_row_in_range = false;
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bool _has_rt = false;
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// True iff current population interval, since the previous clustering row, starts before all clustered rows.
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// We cannot just look at _lower_bound, because emission of range tombstones changes _lower_bound and
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// because we mark clustering intervals as continuous when consuming a clustering_row, it would prevent
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// us from marking the interval as continuous.
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// Valid when _state == reading_from_underlying.
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bool _population_range_starts_before_all_rows;
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// Points to the underlying reader conforming to _schema,
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// either to *_underlying_holder or _read_context.underlying().underlying().
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flat_mutation_reader_v2* _underlying = nullptr;
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flat_mutation_reader_v2_opt _underlying_holder;
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gc_clock::time_point _read_time;
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gc_clock::time_point _gc_before;
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future<> do_fill_buffer();
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future<> ensure_underlying();
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void copy_from_cache_to_buffer();
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future<> process_static_row();
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void move_to_end();
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void move_to_next_range();
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void move_to_range(query::clustering_row_ranges::const_iterator);
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void move_to_next_entry();
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void maybe_drop_last_entry(tombstone) noexcept;
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void add_to_buffer(const partition_snapshot_row_cursor&);
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void add_clustering_row_to_buffer(mutation_fragment_v2&&);
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void add_to_buffer(range_tombstone_change&&);
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void offer_from_underlying(mutation_fragment_v2&&);
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future<> read_from_underlying();
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void start_reading_from_underlying();
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bool after_current_range(position_in_partition_view position);
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bool can_populate() const;
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// Marks the range between _last_row (exclusive) and _next_row (exclusive) as continuous,
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// provided that the underlying reader still matches the latest version of the partition.
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// Invalidates _last_row.
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void maybe_update_continuity();
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// Tries to ensure that the lower bound of the current population range exists.
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// Returns false if it failed and range cannot be populated.
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// Assumes can_populate().
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// If returns true then _last_row is refreshed and points to the population lower bound.
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// if _read_context.is_reversed() then _last_row is always valid after this.
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// if !_read_context.is_reversed() then _last_row is valid after this or the population lower bound
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// is before all rows (so _last_row doesn't point at any entry).
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bool ensure_population_lower_bound();
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void maybe_add_to_cache(const mutation_fragment_v2& mf);
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void maybe_add_to_cache(const clustering_row& cr);
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bool maybe_add_to_cache(const range_tombstone_change& rtc);
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void maybe_add_to_cache(const static_row& sr);
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void maybe_set_static_row_continuous();
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void finish_reader() {
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push_mutation_fragment(*_schema, _permit, partition_end());
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_end_of_stream = true;
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_state = state::end_of_stream;
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}
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const schema_ptr& snp_schema() const {
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return _snp->schema();
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}
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void touch_partition();
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position_in_partition_view to_table_domain(position_in_partition_view query_domain_pos) {
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if (!_read_context.is_reversed()) [[likely]] {
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return query_domain_pos;
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}
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return query_domain_pos.reversed();
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}
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range_tombstone to_table_domain(range_tombstone query_domain_rt) {
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if (_read_context.is_reversed()) [[unlikely]] {
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query_domain_rt.reverse();
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}
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return query_domain_rt;
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}
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position_in_partition_view to_query_domain(position_in_partition_view table_domain_pos) {
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if (!_read_context.is_reversed()) [[likely]] {
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return table_domain_pos;
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}
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return table_domain_pos.reversed();
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}
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const schema& table_schema() {
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return *_snp->schema();
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}
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gc_clock::time_point get_read_time() {
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return _read_context.tombstone_gc_state() ? gc_clock::now() : gc_clock::time_point::min();
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}
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gc_clock::time_point get_gc_before(const schema& schema, dht::decorated_key dk, const gc_clock::time_point query_time) {
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auto gc_state = _read_context.tombstone_gc_state();
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if (gc_state) {
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return gc_state->get_gc_before_for_key(schema.shared_from_this(), dk, query_time);
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}
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return gc_clock::time_point::min();
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}
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public:
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cache_flat_mutation_reader(schema_ptr s,
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dht::decorated_key dk,
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query::clustering_key_filter_ranges&& crr,
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read_context& ctx,
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partition_snapshot_ptr snp,
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row_cache& cache)
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: flat_mutation_reader_v2::impl(std::move(s), ctx.permit())
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, _snp(std::move(snp))
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, _ck_ranges(std::move(crr))
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, _ck_ranges_curr(_ck_ranges.begin())
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, _ck_ranges_end(_ck_ranges.end())
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, _lsa_manager(cache)
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, _lower_bound(position_in_partition::before_all_clustered_rows())
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, _upper_bound(position_in_partition_view::before_all_clustered_rows())
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, _read_context_holder()
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, _read_context(ctx) // ctx is owned by the caller, who's responsible for closing it.
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, _next_row(*_schema, *_snp, false, _read_context.is_reversed())
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, _read_time(get_read_time())
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, _gc_before(get_gc_before(*_schema, dk, _read_time))
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{
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clogger.trace("csm {}: table={}.{}, reversed={}, snap={}", fmt::ptr(this), _schema->ks_name(), _schema->cf_name(), _read_context.is_reversed(),
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fmt::ptr(&*_snp));
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push_mutation_fragment(*_schema, _permit, partition_start(std::move(dk), _snp->partition_tombstone()));
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}
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cache_flat_mutation_reader(schema_ptr s,
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dht::decorated_key dk,
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query::clustering_key_filter_ranges&& crr,
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std::unique_ptr<read_context> unique_ctx,
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partition_snapshot_ptr snp,
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row_cache& cache)
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: cache_flat_mutation_reader(s, std::move(dk), std::move(crr), *unique_ctx, std::move(snp), cache)
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{
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// Assume ownership of the read_context.
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// It is our responsibility to close it now.
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_read_context_holder = std::move(unique_ctx);
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}
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cache_flat_mutation_reader(const cache_flat_mutation_reader&) = delete;
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cache_flat_mutation_reader(cache_flat_mutation_reader&&) = delete;
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virtual future<> fill_buffer() override;
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virtual future<> next_partition() override {
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clear_buffer_to_next_partition();
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if (is_buffer_empty()) {
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_end_of_stream = true;
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}
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return make_ready_future<>();
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}
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virtual future<> fast_forward_to(const dht::partition_range&) override {
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clear_buffer();
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_end_of_stream = true;
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return make_ready_future<>();
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}
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virtual future<> fast_forward_to(position_range pr) override {
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return make_exception_future<>(make_backtraced_exception_ptr<std::bad_function_call>());
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}
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virtual future<> close() noexcept override {
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auto close_read_context = _read_context_holder ? _read_context_holder->close() : make_ready_future<>();
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auto close_underlying = _underlying_holder ? _underlying_holder->close() : make_ready_future<>();
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return when_all_succeed(std::move(close_read_context), std::move(close_underlying)).discard_result();
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}
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};
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inline
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future<> cache_flat_mutation_reader::process_static_row() {
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if (_snp->static_row_continuous()) {
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_read_context.cache().on_row_hit();
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static_row sr = _lsa_manager.run_in_read_section([this] {
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return _snp->static_row(_read_context.digest_requested());
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});
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if (!sr.empty()) {
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push_mutation_fragment(*_schema, _permit, std::move(sr));
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}
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return make_ready_future<>();
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} else {
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_read_context.cache().on_row_miss();
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return ensure_underlying().then([this] {
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return (*_underlying)().then([this] (mutation_fragment_v2_opt&& sr) {
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if (sr) {
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assert(sr->is_static_row());
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maybe_add_to_cache(sr->as_static_row());
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push_mutation_fragment(std::move(*sr));
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}
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maybe_set_static_row_continuous();
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});
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});
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}
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}
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inline
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void cache_flat_mutation_reader::touch_partition() {
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_snp->touch();
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}
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inline
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future<> cache_flat_mutation_reader::fill_buffer() {
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if (_state == state::before_static_row) {
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touch_partition();
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auto after_static_row = [this] {
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if (_ck_ranges_curr == _ck_ranges_end) {
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finish_reader();
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return make_ready_future<>();
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}
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_state = state::reading_from_cache;
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_lsa_manager.run_in_read_section([this] {
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move_to_range(_ck_ranges_curr);
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});
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return fill_buffer();
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};
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if (_schema->has_static_columns()) {
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return process_static_row().then(std::move(after_static_row));
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} else {
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return after_static_row();
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}
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}
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clogger.trace("csm {}: fill_buffer(), range={}, lb={}", fmt::ptr(this), *_ck_ranges_curr, _lower_bound);
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return do_until([this] { return _end_of_stream || is_buffer_full(); }, [this] {
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return do_fill_buffer();
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});
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}
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inline
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future<> cache_flat_mutation_reader::ensure_underlying() {
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if (_underlying) {
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return make_ready_future<>();
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}
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return _read_context.ensure_underlying().then([this] {
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flat_mutation_reader_v2& ctx_underlying = _read_context.underlying().underlying();
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if (ctx_underlying.schema() != _schema) {
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_underlying_holder = make_delegating_reader(ctx_underlying);
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_underlying_holder->upgrade_schema(_schema);
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_underlying = &*_underlying_holder;
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} else {
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_underlying = &ctx_underlying;
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}
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});
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}
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inline
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future<> cache_flat_mutation_reader::do_fill_buffer() {
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if (_state == state::move_to_underlying) {
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if (!_underlying) {
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return ensure_underlying().then([this] {
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return do_fill_buffer();
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});
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}
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_state = state::reading_from_underlying;
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_population_range_starts_before_all_rows = _lower_bound.is_before_all_clustered_rows(*_schema) && !_read_context.is_reversed();
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_underlying_upper_bound = _next_row_in_range ? position_in_partition::before_key(_next_row.position())
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: position_in_partition(_upper_bound);
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if (!_read_context.partition_exists()) {
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clogger.trace("csm {}: partition does not exist", fmt::ptr(this));
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if (_current_tombstone) {
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clogger.trace("csm {}: move_to_underlying: emit rtc({}, null)", fmt::ptr(this), _lower_bound);
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push_mutation_fragment(mutation_fragment_v2(*_schema, _permit, range_tombstone_change(_lower_bound, {})));
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_current_tombstone = {};
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}
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return read_from_underlying();
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}
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return _underlying->fast_forward_to(position_range{_lower_bound, *_underlying_upper_bound}).then([this] {
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if (!_current_tombstone) {
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return read_from_underlying();
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}
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return _underlying->peek().then([this] (mutation_fragment_v2* mf) {
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position_in_partition::equal_compare eq(*_schema);
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if (!mf || !mf->is_range_tombstone_change()
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|| !eq(mf->as_range_tombstone_change().position(), _lower_bound)) {
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clogger.trace("csm {}: move_to_underlying: emit rtc({}, null)", fmt::ptr(this), _lower_bound);
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push_mutation_fragment(mutation_fragment_v2(*_schema, _permit, range_tombstone_change(_lower_bound, {})));
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_current_tombstone = {};
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}
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return read_from_underlying();
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});
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});
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}
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if (_state == state::reading_from_underlying) {
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return read_from_underlying();
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}
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// assert(_state == state::reading_from_cache)
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return _lsa_manager.run_in_read_section([this] {
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auto next_valid = _next_row.iterators_valid();
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clogger.trace("csm {}: reading_from_cache, range=[{}, {}), next={}, valid={}, rt={}", fmt::ptr(this), _lower_bound,
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_upper_bound, _next_row.position(), next_valid, _current_tombstone);
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// We assume that if there was eviction, and thus the range may
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// no longer be continuous, the cursor was invalidated.
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if (!next_valid) {
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auto adjacent = _next_row.advance_to(_lower_bound);
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_next_row_in_range = !after_current_range(_next_row.position());
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if (!adjacent && !_next_row.continuous()) {
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_last_row = nullptr; // We could insert a dummy here, but this path is unlikely.
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start_reading_from_underlying();
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return make_ready_future<>();
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}
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}
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_next_row.maybe_refresh();
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clogger.trace("csm {}: next={}", fmt::ptr(this), _next_row);
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while (_state == state::reading_from_cache) {
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copy_from_cache_to_buffer();
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if (need_preempt() || is_buffer_full()) {
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break;
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}
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}
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return make_ready_future<>();
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});
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}
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inline
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future<> cache_flat_mutation_reader::read_from_underlying() {
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return consume_mutation_fragments_until(*_underlying,
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[this] { return _state != state::reading_from_underlying || is_buffer_full(); },
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[this] (mutation_fragment_v2 mf) {
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_read_context.cache().on_row_miss();
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offer_from_underlying(std::move(mf));
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},
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[this] {
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_lower_bound = std::move(*_underlying_upper_bound);
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_underlying_upper_bound.reset();
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_state = state::reading_from_cache;
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_lsa_manager.run_in_update_section([this] {
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auto same_pos = _next_row.maybe_refresh();
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clogger.trace("csm {}: underlying done, in_range={}, same={}, next={}", fmt::ptr(this), _next_row_in_range, same_pos, _next_row);
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if (!same_pos) {
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_read_context.cache().on_mispopulate(); // FIXME: Insert dummy entry at _lower_bound.
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_next_row_in_range = !after_current_range(_next_row.position());
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if (!_next_row.continuous()) {
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_last_row = nullptr; // We did not populate the full range up to _lower_bound, break continuity
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start_reading_from_underlying();
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}
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return;
|
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}
|
|
if (_next_row_in_range) {
|
|
maybe_update_continuity();
|
|
} else {
|
|
if (can_populate()) {
|
|
const schema& table_s = table_schema();
|
|
rows_entry::tri_compare cmp(table_s);
|
|
auto& rows = _snp->version()->partition().mutable_clustered_rows();
|
|
if (query::is_single_row(*_schema, *_ck_ranges_curr)) {
|
|
// If there are range tombstones which apply to the row then
|
|
// we cannot insert an empty entry here because if those range
|
|
// tombstones got evicted by now, we will insert an entry
|
|
// with missing range tombstone information.
|
|
// FIXME: try to set the range tombstone when possible.
|
|
if (!_has_rt) {
|
|
with_allocator(_snp->region().allocator(), [&] {
|
|
auto e = alloc_strategy_unique_ptr<rows_entry>(
|
|
current_allocator().construct<rows_entry>(_ck_ranges_curr->start()->value()));
|
|
// Use _next_row iterator only as a hint, because there could be insertions after _upper_bound.
|
|
auto insert_result = rows.insert_before_hint(_next_row.get_iterator_in_latest_version(), std::move(e), cmp);
|
|
if (insert_result.second) {
|
|
auto it = insert_result.first;
|
|
_snp->tracker()->insert(*it);
|
|
auto next = std::next(it);
|
|
// Also works in reverse read mode.
|
|
// It preserves the continuity of the range the entry falls into.
|
|
it->set_continuous(next->continuous());
|
|
clogger.trace("csm {}: inserted empty row at {}, cont={}, rt={}", fmt::ptr(this), it->position(), it->continuous(), it->range_tombstone());
|
|
}
|
|
});
|
|
}
|
|
} else if (ensure_population_lower_bound()) {
|
|
with_allocator(_snp->region().allocator(), [&] {
|
|
auto e = alloc_strategy_unique_ptr<rows_entry>(
|
|
current_allocator().construct<rows_entry>(table_s, to_table_domain(_upper_bound), is_dummy::yes, is_continuous::no));
|
|
// Use _next_row iterator only as a hint, because there could be insertions after _upper_bound.
|
|
auto insert_result = rows.insert_before_hint(_next_row.get_iterator_in_latest_version(), std::move(e), cmp);
|
|
if (insert_result.second) {
|
|
clogger.trace("csm {}: L{}: inserted dummy at {}", fmt::ptr(this), __LINE__, _upper_bound);
|
|
_snp->tracker()->insert(*insert_result.first);
|
|
}
|
|
if (_read_context.is_reversed()) [[unlikely]] {
|
|
clogger.trace("csm {}: set_continuous({}), prev={}, rt={}", fmt::ptr(this), _last_row.position(), insert_result.first->position(), _current_tombstone);
|
|
_last_row->set_continuous(true);
|
|
_last_row->set_range_tombstone(_current_tombstone);
|
|
} else {
|
|
clogger.trace("csm {}: set_continuous({}), prev={}, rt={}", fmt::ptr(this), insert_result.first->position(), _last_row.position(), _current_tombstone);
|
|
insert_result.first->set_continuous(true);
|
|
insert_result.first->set_range_tombstone(_current_tombstone);
|
|
}
|
|
maybe_drop_last_entry(_current_tombstone);
|
|
});
|
|
}
|
|
} else {
|
|
_read_context.cache().on_mispopulate();
|
|
}
|
|
try {
|
|
move_to_next_range();
|
|
} catch (const std::bad_alloc&) {
|
|
// We cannot reenter the section, since we may have moved to the new range
|
|
_snp->region().allocator().invalidate_references(); // Invalidates _next_row
|
|
}
|
|
}
|
|
});
|
|
return make_ready_future<>();
|
|
});
|
|
}
|
|
|
|
inline
|
|
bool cache_flat_mutation_reader::ensure_population_lower_bound() {
|
|
if (_population_range_starts_before_all_rows) {
|
|
return true;
|
|
}
|
|
if (!_last_row.refresh(*_snp)) {
|
|
return false;
|
|
}
|
|
// Continuity flag we will later set for the upper bound extends to the previous row in the same version,
|
|
// so we need to ensure we have an entry in the latest version.
|
|
if (!_last_row.is_in_latest_version()) {
|
|
rows_entry::tri_compare cmp(*_schema);
|
|
partition_snapshot_row_cursor cur(*_schema, *_snp, false, _read_context.is_reversed());
|
|
|
|
if (!cur.advance_to(_last_row.position())) {
|
|
return false;
|
|
}
|
|
|
|
if (cmp(cur.position(), _last_row.position()) != 0) {
|
|
return false;
|
|
}
|
|
|
|
auto res = with_allocator(_snp->region().allocator(), [&] {
|
|
return cur.ensure_entry_in_latest();
|
|
});
|
|
|
|
_last_row.set_latest(res.it);
|
|
if (res.inserted) {
|
|
clogger.trace("csm {}: inserted lower bound dummy at {}", fmt::ptr(this), _last_row.position());
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
inline
|
|
void cache_flat_mutation_reader::maybe_update_continuity() {
|
|
position_in_partition::equal_compare eq(*_schema);
|
|
if (can_populate()
|
|
&& ensure_population_lower_bound()
|
|
&& !eq(_last_row.position(), _next_row.position())) {
|
|
with_allocator(_snp->region().allocator(), [&] {
|
|
rows_entry& e = _next_row.ensure_entry_in_latest().row;
|
|
auto& rows = _snp->version()->partition().mutable_clustered_rows();
|
|
const schema& table_s = table_schema();
|
|
rows_entry::tri_compare table_cmp(table_s);
|
|
|
|
if (_read_context.is_reversed()) [[unlikely]] {
|
|
if (_current_tombstone != _last_row->range_tombstone() && !_last_row->dummy()) {
|
|
with_allocator(_snp->region().allocator(), [&] {
|
|
auto e2 = alloc_strategy_unique_ptr<rows_entry>(
|
|
current_allocator().construct<rows_entry>(table_s,
|
|
position_in_partition_view::before_key(_last_row->position()),
|
|
is_dummy::yes,
|
|
is_continuous::yes));
|
|
auto insert_result = rows.insert(std::move(e2), table_cmp);
|
|
if (insert_result.second) {
|
|
clogger.trace("csm {}: L{}: inserted dummy at {}", fmt::ptr(this), __LINE__, insert_result.first->position());
|
|
_snp->tracker()->insert(*insert_result.first);
|
|
}
|
|
clogger.trace("csm {}: set_continuous({}), prev={}, rt={}", fmt::ptr(this), insert_result.first->position(),
|
|
_last_row.position(), _current_tombstone);
|
|
insert_result.first->set_continuous(true);
|
|
insert_result.first->set_range_tombstone(_current_tombstone);
|
|
clogger.trace("csm {}: set_continuous({})", fmt::ptr(this), _last_row.position());
|
|
_last_row->set_continuous(true);
|
|
});
|
|
} else {
|
|
clogger.trace("csm {}: set_continuous({}), rt={}", fmt::ptr(this), _last_row.position(), _current_tombstone);
|
|
_last_row->set_continuous(true);
|
|
_last_row->set_range_tombstone(_current_tombstone);
|
|
}
|
|
} else {
|
|
if (_current_tombstone != e.range_tombstone() && !e.dummy()) {
|
|
with_allocator(_snp->region().allocator(), [&] {
|
|
auto e2 = alloc_strategy_unique_ptr<rows_entry>(
|
|
current_allocator().construct<rows_entry>(table_s,
|
|
position_in_partition_view::before_key(e.position()),
|
|
is_dummy::yes,
|
|
is_continuous::yes));
|
|
// Use _next_row iterator only as a hint because there could be insertions before
|
|
// _next_row.get_iterator_in_latest_version(), either from concurrent reads,
|
|
// from _next_row.ensure_entry_in_latest().
|
|
auto insert_result = rows.insert_before_hint(_next_row.get_iterator_in_latest_version(), std::move(e2), table_cmp);
|
|
if (insert_result.second) {
|
|
clogger.trace("csm {}: L{}: inserted dummy at {}", fmt::ptr(this), __LINE__, insert_result.first->position());
|
|
_snp->tracker()->insert(*insert_result.first);
|
|
}
|
|
clogger.trace("csm {}: set_continuous({}), prev={}, rt={}", fmt::ptr(this), insert_result.first->position(),
|
|
_last_row.position(), _current_tombstone);
|
|
insert_result.first->set_continuous(true);
|
|
insert_result.first->set_range_tombstone(_current_tombstone);
|
|
clogger.trace("csm {}: set_continuous({})", fmt::ptr(this), e.position());
|
|
e.set_continuous(true);
|
|
});
|
|
} else {
|
|
clogger.trace("csm {}: set_continuous({}), rt={}", fmt::ptr(this), e.position(), _current_tombstone);
|
|
e.set_range_tombstone(_current_tombstone);
|
|
e.set_continuous(true);
|
|
}
|
|
}
|
|
maybe_drop_last_entry(_current_tombstone);
|
|
});
|
|
} else {
|
|
_read_context.cache().on_mispopulate();
|
|
}
|
|
}
|
|
|
|
inline
|
|
void cache_flat_mutation_reader::maybe_add_to_cache(const clustering_row& cr) {
|
|
if (!can_populate()) {
|
|
_last_row = nullptr;
|
|
_population_range_starts_before_all_rows = false;
|
|
_read_context.cache().on_mispopulate();
|
|
return;
|
|
}
|
|
clogger.trace("csm {}: populate({}), rt={}", fmt::ptr(this), clustering_row::printer(*_schema, cr), _current_tombstone);
|
|
_lsa_manager.run_in_update_section_with_allocator([this, &cr] {
|
|
mutation_partition_v2& mp = _snp->version()->partition();
|
|
rows_entry::tri_compare cmp(table_schema());
|
|
|
|
if (_read_context.digest_requested()) {
|
|
cr.cells().prepare_hash(*_schema, column_kind::regular_column);
|
|
}
|
|
auto new_entry = alloc_strategy_unique_ptr<rows_entry>(
|
|
current_allocator().construct<rows_entry>(table_schema(), cr.key(), cr.as_deletable_row()));
|
|
new_entry->set_continuous(false);
|
|
new_entry->set_range_tombstone(_current_tombstone);
|
|
auto it = _next_row.iterators_valid() ? _next_row.get_iterator_in_latest_version()
|
|
: mp.clustered_rows().lower_bound(cr.key(), cmp);
|
|
auto insert_result = mp.mutable_clustered_rows().insert_before_hint(it, std::move(new_entry), cmp);
|
|
it = insert_result.first;
|
|
if (insert_result.second) {
|
|
_snp->tracker()->insert(*it);
|
|
}
|
|
|
|
rows_entry& e = *it;
|
|
if (ensure_population_lower_bound()) {
|
|
if (_read_context.is_reversed()) [[unlikely]] {
|
|
clogger.trace("csm {}: set_continuous({})", fmt::ptr(this), _last_row.position());
|
|
_last_row->set_continuous(true);
|
|
// _current_tombstone must also apply to _last_row itself (if it's non-dummy)
|
|
// because otherwise there would be a rtc after it, either creating a different entry,
|
|
// or clearing _last_row if population did not happen.
|
|
_last_row->set_range_tombstone(_current_tombstone);
|
|
} else {
|
|
clogger.trace("csm {}: set_continuous({})", fmt::ptr(this), e.position());
|
|
e.set_continuous(true);
|
|
e.set_range_tombstone(_current_tombstone);
|
|
}
|
|
} else {
|
|
_read_context.cache().on_mispopulate();
|
|
}
|
|
with_allocator(standard_allocator(), [&] {
|
|
_last_row = partition_snapshot_row_weakref(*_snp, it, true);
|
|
});
|
|
_population_range_starts_before_all_rows = false;
|
|
});
|
|
}
|
|
|
|
inline
|
|
bool cache_flat_mutation_reader::maybe_add_to_cache(const range_tombstone_change& rtc) {
|
|
rows_entry::tri_compare q_cmp(*_schema);
|
|
|
|
clogger.trace("csm {}: maybe_add_to_cache({})", fmt::ptr(this), rtc);
|
|
|
|
// Don't emit the closing range tombstone change, we may continue from cache with the same tombstone.
|
|
// The following relies on !_underlying_upper_bound->is_clustering_row()
|
|
if (q_cmp(rtc.position(), *_underlying_upper_bound) == 0) {
|
|
_lower_bound = rtc.position();
|
|
return false;
|
|
}
|
|
|
|
auto prev = std::exchange(_current_tombstone, rtc.tombstone());
|
|
if (_current_tombstone == prev) {
|
|
return false;
|
|
}
|
|
|
|
if (!can_populate()) {
|
|
// _current_tombstone is now invalid and remains so for this reader. No need to change it.
|
|
_last_row = nullptr;
|
|
_population_range_starts_before_all_rows = false;
|
|
_read_context.cache().on_mispopulate();
|
|
return true;
|
|
}
|
|
|
|
_lsa_manager.run_in_update_section_with_allocator([&] {
|
|
mutation_partition_v2& mp = _snp->version()->partition();
|
|
rows_entry::tri_compare cmp(table_schema());
|
|
|
|
auto new_entry = alloc_strategy_unique_ptr<rows_entry>(
|
|
current_allocator().construct<rows_entry>(table_schema(), to_table_domain(rtc.position()), is_dummy::yes, is_continuous::no));
|
|
auto it = _next_row.iterators_valid() ? _next_row.get_iterator_in_latest_version()
|
|
: mp.clustered_rows().lower_bound(to_table_domain(rtc.position()), cmp);
|
|
auto insert_result = mp.mutable_clustered_rows().insert_before_hint(it, std::move(new_entry), cmp);
|
|
it = insert_result.first;
|
|
if (insert_result.second) {
|
|
_snp->tracker()->insert(*it);
|
|
}
|
|
|
|
rows_entry& e = *it;
|
|
if (ensure_population_lower_bound()) {
|
|
// underlying may emit range_tombstone_change fragments with the same position.
|
|
// In such case, the range to which the tombstone from the first fragment applies is empty and should be ignored.
|
|
if (q_cmp(_last_row.position(), it->position()) < 0) {
|
|
if (_read_context.is_reversed()) [[unlikely]] {
|
|
clogger.trace("csm {}: set_continuous({}), rt={}", fmt::ptr(this), _last_row.position(), prev);
|
|
_last_row->set_continuous(true);
|
|
_last_row->set_range_tombstone(prev);
|
|
} else {
|
|
clogger.trace("csm {}: set_continuous({}), rt={}", fmt::ptr(this), e.position(), prev);
|
|
e.set_continuous(true);
|
|
e.set_range_tombstone(prev);
|
|
}
|
|
}
|
|
} else {
|
|
_read_context.cache().on_mispopulate();
|
|
}
|
|
with_allocator(standard_allocator(), [&] {
|
|
_last_row = partition_snapshot_row_weakref(*_snp, it, true);
|
|
});
|
|
_population_range_starts_before_all_rows = false;
|
|
});
|
|
return true;
|
|
}
|
|
|
|
inline
|
|
bool cache_flat_mutation_reader::after_current_range(position_in_partition_view p) {
|
|
position_in_partition::tri_compare cmp(*_schema);
|
|
return cmp(p, _upper_bound) >= 0;
|
|
}
|
|
|
|
inline
|
|
void cache_flat_mutation_reader::start_reading_from_underlying() {
|
|
clogger.trace("csm {}: start_reading_from_underlying(), range=[{}, {})", fmt::ptr(this), _lower_bound, _next_row_in_range ? _next_row.position() : _upper_bound);
|
|
_state = state::move_to_underlying;
|
|
_next_row.touch();
|
|
}
|
|
|
|
inline
|
|
void cache_flat_mutation_reader::copy_from_cache_to_buffer() {
|
|
clogger.trace("csm {}: copy_from_cache, next_row_in_range={}, next={}", fmt::ptr(this), _next_row_in_range, _next_row);
|
|
_next_row.touch();
|
|
|
|
if (_next_row.range_tombstone() != _current_tombstone) {
|
|
position_in_partition::equal_compare eq(*_schema);
|
|
auto upper_bound = _next_row_in_range ? position_in_partition_view::before_key(_next_row.position()) : _upper_bound;
|
|
if (!eq(_lower_bound, upper_bound)) {
|
|
position_in_partition new_lower_bound(upper_bound);
|
|
auto tomb = _next_row.range_tombstone();
|
|
clogger.trace("csm {}: rtc({}, {}) ...{}", fmt::ptr(this), _lower_bound, tomb, new_lower_bound);
|
|
push_mutation_fragment(mutation_fragment_v2(*_schema, _permit, range_tombstone_change(_lower_bound, tomb)));
|
|
_current_tombstone = tomb;
|
|
_lower_bound = std::move(new_lower_bound);
|
|
_read_context.cache()._tracker.on_range_tombstone_read();
|
|
}
|
|
}
|
|
|
|
if (_next_row_in_range) {
|
|
bool remove_row = false;
|
|
|
|
if (_read_context.tombstone_gc_state() // do not compact rows when tombstone_gc_state is not set (used in some unit tests)
|
|
&& !_next_row.dummy()
|
|
&& _snp->at_latest_version()
|
|
&& _snp->at_oldest_version()) {
|
|
deletable_row& row = _next_row.latest_row();
|
|
auto t = row.deleted_at();
|
|
|
|
auto row_tomb_expired = [&](row_tombstone tomb) {
|
|
return (tomb && tomb.max_deletion_time() < _gc_before);
|
|
};
|
|
|
|
auto is_row_dead = [&](const deletable_row& row) {
|
|
auto& m = row.marker();
|
|
return (!m.is_missing() && m.is_dead(_read_time) && m.deletion_time() < _gc_before);
|
|
};
|
|
|
|
if (row_tomb_expired(t) || is_row_dead(row)) {
|
|
can_gc_fn always_gc = [&](tombstone) { return true; };
|
|
const schema& row_schema = _next_row.latest_row_schema();
|
|
|
|
_read_context.cache()._tracker.on_row_compacted();
|
|
|
|
with_allocator(_snp->region().allocator(), [&] {
|
|
deletable_row row_copy(row_schema, row);
|
|
row_copy.compact_and_expire(row_schema, t.tomb(), _read_time, always_gc, _gc_before, nullptr);
|
|
std::swap(row, row_copy);
|
|
});
|
|
remove_row = row.empty();
|
|
}
|
|
}
|
|
|
|
if (_next_row.range_tombstone_for_row() != _current_tombstone) [[unlikely]] {
|
|
auto tomb = _next_row.range_tombstone_for_row();
|
|
auto new_lower_bound = position_in_partition::before_key(_next_row.position());
|
|
clogger.trace("csm {}: rtc({}, {})", fmt::ptr(this), new_lower_bound, tomb);
|
|
push_mutation_fragment(mutation_fragment_v2(*_schema, _permit, range_tombstone_change(new_lower_bound, tomb)));
|
|
_lower_bound = std::move(new_lower_bound);
|
|
_current_tombstone = tomb;
|
|
_read_context.cache()._tracker.on_range_tombstone_read();
|
|
}
|
|
|
|
if (remove_row) {
|
|
_read_context.cache()._tracker.on_row_compacted_away();
|
|
|
|
_lower_bound = position_in_partition::after_key(*_schema, _next_row.position());
|
|
|
|
partition_snapshot_row_weakref row_ref(_next_row);
|
|
move_to_next_entry();
|
|
|
|
with_allocator(_snp->region().allocator(), [&] {
|
|
cache_tracker& tracker = _read_context.cache()._tracker;
|
|
if (row_ref->is_linked()) {
|
|
tracker.get_lru().remove(*row_ref);
|
|
}
|
|
row_ref->on_evicted(tracker);
|
|
});
|
|
|
|
_snp->region().allocator().invalidate_references();
|
|
_next_row.force_valid();
|
|
} else {
|
|
// We add the row to the buffer even when it's full.
|
|
// This simplifies the code. For more info see #3139.
|
|
add_to_buffer(_next_row);
|
|
move_to_next_entry();
|
|
}
|
|
} else {
|
|
move_to_next_range();
|
|
}
|
|
}
|
|
|
|
inline
|
|
void cache_flat_mutation_reader::move_to_end() {
|
|
finish_reader();
|
|
clogger.trace("csm {}: eos", fmt::ptr(this));
|
|
}
|
|
|
|
inline
|
|
void cache_flat_mutation_reader::move_to_next_range() {
|
|
if (_current_tombstone) {
|
|
clogger.trace("csm {}: move_to_next_range: emit rtc({}, null)", fmt::ptr(this), _upper_bound);
|
|
push_mutation_fragment(mutation_fragment_v2(*_schema, _permit, range_tombstone_change(_upper_bound, {})));
|
|
_current_tombstone = {};
|
|
}
|
|
auto next_it = std::next(_ck_ranges_curr);
|
|
if (next_it == _ck_ranges_end) {
|
|
move_to_end();
|
|
_ck_ranges_curr = next_it;
|
|
} else {
|
|
move_to_range(next_it);
|
|
}
|
|
}
|
|
|
|
inline
|
|
void cache_flat_mutation_reader::move_to_range(query::clustering_row_ranges::const_iterator next_it) {
|
|
auto lb = position_in_partition::for_range_start(*next_it);
|
|
auto ub = position_in_partition_view::for_range_end(*next_it);
|
|
_last_row = nullptr;
|
|
_lower_bound = std::move(lb);
|
|
_upper_bound = std::move(ub);
|
|
_ck_ranges_curr = next_it;
|
|
auto adjacent = _next_row.advance_to(_lower_bound);
|
|
_next_row_in_range = !after_current_range(_next_row.position());
|
|
clogger.trace("csm {}: move_to_range(), range={}, lb={}, ub={}, next={}", fmt::ptr(this), *_ck_ranges_curr, _lower_bound, _upper_bound, _next_row.position());
|
|
if (!adjacent && !_next_row.continuous()) {
|
|
// FIXME: We don't insert a dummy for singular range to avoid allocating 3 entries
|
|
// for a hit (before, at and after). If we supported the concept of an incomplete row,
|
|
// we could insert such a row for the lower bound if it's full instead, for both singular and
|
|
// non-singular ranges.
|
|
if (_ck_ranges_curr->start() && !query::is_single_row(*_schema, *_ck_ranges_curr)) {
|
|
// Insert dummy for lower bound
|
|
if (can_populate()) {
|
|
// FIXME: _lower_bound could be adjacent to the previous row, in which case we could skip this
|
|
clogger.trace("csm {}: insert dummy at {}", fmt::ptr(this), _lower_bound);
|
|
auto insert_result = with_allocator(_lsa_manager.region().allocator(), [&] {
|
|
rows_entry::tri_compare cmp(table_schema());
|
|
auto& rows = _snp->version()->partition().mutable_clustered_rows();
|
|
auto new_entry = alloc_strategy_unique_ptr<rows_entry>(current_allocator().construct<rows_entry>(table_schema(),
|
|
to_table_domain(_lower_bound), is_dummy::yes, is_continuous::no));
|
|
return rows.insert_before_hint(_next_row.get_iterator_in_latest_version(), std::move(new_entry), cmp);
|
|
});
|
|
auto it = insert_result.first;
|
|
if (insert_result.second) {
|
|
_snp->tracker()->insert(*it);
|
|
}
|
|
_last_row = partition_snapshot_row_weakref(*_snp, it, true);
|
|
} else {
|
|
_read_context.cache().on_mispopulate();
|
|
}
|
|
}
|
|
start_reading_from_underlying();
|
|
}
|
|
}
|
|
|
|
// Drops _last_row entry when possible without changing logical contents of the partition.
|
|
// Call only when _last_row and _next_row are valid.
|
|
// Calling after ensure_population_lower_bound() is ok.
|
|
// _next_row must have a greater position than _last_row.
|
|
// Invalidates references but keeps the _next_row valid.
|
|
inline
|
|
void cache_flat_mutation_reader::maybe_drop_last_entry(tombstone rt) noexcept {
|
|
// Drop dummy entry if it falls inside a continuous range.
|
|
// This prevents unnecessary dummy entries from accumulating in cache and slowing down scans.
|
|
//
|
|
// Eviction can happen only from oldest versions to preserve the continuity non-overlapping rule
|
|
// (See docs/dev/row_cache.md)
|
|
//
|
|
if (_last_row
|
|
&& !_read_context.is_reversed() // FIXME
|
|
&& _last_row->dummy()
|
|
&& _last_row->continuous()
|
|
&& _last_row->range_tombstone() == rt
|
|
&& _snp->at_latest_version()
|
|
&& _snp->at_oldest_version()) {
|
|
|
|
clogger.trace("csm {}: dropping unnecessary dummy at {}", fmt::ptr(this), _last_row->position());
|
|
|
|
with_allocator(_snp->region().allocator(), [&] {
|
|
cache_tracker& tracker = _read_context.cache()._tracker;
|
|
tracker.get_lru().remove(*_last_row);
|
|
_last_row->on_evicted(tracker);
|
|
});
|
|
_last_row = nullptr;
|
|
|
|
// There could be iterators pointing to _last_row, invalidate them
|
|
_snp->region().allocator().invalidate_references();
|
|
|
|
// Don't invalidate _next_row, move_to_next_entry() expects it to be still valid.
|
|
_next_row.force_valid();
|
|
}
|
|
}
|
|
|
|
// _next_row must be inside the range.
|
|
inline
|
|
void cache_flat_mutation_reader::move_to_next_entry() {
|
|
clogger.trace("csm {}: move_to_next_entry(), curr={}", fmt::ptr(this), _next_row.position());
|
|
if (no_clustering_row_between(*_schema, _next_row.position(), _upper_bound)) {
|
|
move_to_next_range();
|
|
} else {
|
|
auto new_last_row = partition_snapshot_row_weakref(_next_row);
|
|
// In reverse mode, the cursor may fall out of the entries because there is no dummy before all rows.
|
|
// Hence !next() doesn't mean we can end the read. The cursor will be positioned before all rows and
|
|
// not point at any row. continuous() is still correctly set.
|
|
_next_row.next();
|
|
_last_row = std::move(new_last_row);
|
|
_next_row_in_range = !after_current_range(_next_row.position());
|
|
clogger.trace("csm {}: next={}, cont={}, in_range={}", fmt::ptr(this), _next_row.position(), _next_row.continuous(), _next_row_in_range);
|
|
if (!_next_row.continuous()) {
|
|
start_reading_from_underlying();
|
|
} else {
|
|
maybe_drop_last_entry(_next_row.range_tombstone());
|
|
}
|
|
}
|
|
}
|
|
|
|
inline
|
|
void cache_flat_mutation_reader::offer_from_underlying(mutation_fragment_v2&& mf) {
|
|
clogger.trace("csm {}: offer_from_underlying({})", fmt::ptr(this), mutation_fragment_v2::printer(*_schema, mf));
|
|
if (mf.is_clustering_row()) {
|
|
maybe_add_to_cache(mf.as_clustering_row());
|
|
add_clustering_row_to_buffer(std::move(mf));
|
|
} else {
|
|
assert(mf.is_range_tombstone_change());
|
|
auto& chg = mf.as_range_tombstone_change();
|
|
if (maybe_add_to_cache(chg)) {
|
|
add_to_buffer(std::move(mf).as_range_tombstone_change());
|
|
}
|
|
}
|
|
}
|
|
|
|
inline
|
|
void cache_flat_mutation_reader::add_to_buffer(const partition_snapshot_row_cursor& row) {
|
|
position_in_partition::less_compare less(*_schema);
|
|
if (!row.dummy()) {
|
|
_read_context.cache().on_row_hit();
|
|
if (_read_context.digest_requested()) {
|
|
row.latest_row_prepare_hash();
|
|
}
|
|
add_clustering_row_to_buffer(mutation_fragment_v2(*_schema, _permit, row.row()));
|
|
} else {
|
|
if (less(_lower_bound, row.position())) {
|
|
_lower_bound = row.position();
|
|
}
|
|
_read_context.cache()._tracker.on_dummy_row_hit();
|
|
}
|
|
}
|
|
|
|
// Maintains the following invariants, also in case of exception:
|
|
// (1) no fragment with position >= _lower_bound was pushed yet
|
|
// (2) If _lower_bound > mf.position(), mf was emitted
|
|
inline
|
|
void cache_flat_mutation_reader::add_clustering_row_to_buffer(mutation_fragment_v2&& mf) {
|
|
clogger.trace("csm {}: add_clustering_row_to_buffer({})", fmt::ptr(this), mutation_fragment_v2::printer(*_schema, mf));
|
|
auto& row = mf.as_clustering_row();
|
|
auto new_lower_bound = position_in_partition::after_key(*_schema, row.key());
|
|
push_mutation_fragment(std::move(mf));
|
|
_lower_bound = std::move(new_lower_bound);
|
|
if (row.tomb()) {
|
|
_read_context.cache()._tracker.on_row_tombstone_read();
|
|
}
|
|
}
|
|
|
|
inline
|
|
void cache_flat_mutation_reader::add_to_buffer(range_tombstone_change&& rtc) {
|
|
clogger.trace("csm {}: add_to_buffer({})", fmt::ptr(this), rtc);
|
|
_has_rt = true;
|
|
position_in_partition::less_compare less(*_schema);
|
|
_lower_bound = position_in_partition(rtc.position());
|
|
push_mutation_fragment(*_schema, _permit, std::move(rtc));
|
|
_read_context.cache()._tracker.on_range_tombstone_read();
|
|
}
|
|
|
|
inline
|
|
void cache_flat_mutation_reader::maybe_add_to_cache(const static_row& sr) {
|
|
if (can_populate()) {
|
|
clogger.trace("csm {}: populate({})", fmt::ptr(this), static_row::printer(*_schema, sr));
|
|
_read_context.cache().on_static_row_insert();
|
|
_lsa_manager.run_in_update_section_with_allocator([&] {
|
|
if (_read_context.digest_requested()) {
|
|
sr.cells().prepare_hash(*_schema, column_kind::static_column);
|
|
}
|
|
// Static row is the same under table and query schema
|
|
_snp->version()->partition().static_row().apply(table_schema(), column_kind::static_column, sr.cells());
|
|
});
|
|
} else {
|
|
_read_context.cache().on_mispopulate();
|
|
}
|
|
}
|
|
|
|
inline
|
|
void cache_flat_mutation_reader::maybe_set_static_row_continuous() {
|
|
if (can_populate()) {
|
|
clogger.trace("csm {}: set static row continuous", fmt::ptr(this));
|
|
_snp->version()->partition().set_static_row_continuous(true);
|
|
} else {
|
|
_read_context.cache().on_mispopulate();
|
|
}
|
|
}
|
|
|
|
inline
|
|
bool cache_flat_mutation_reader::can_populate() const {
|
|
return _snp->at_latest_version() && _read_context.cache().phase_of(_read_context.key()) == _read_context.phase();
|
|
}
|
|
|
|
} // namespace cache
|
|
|
|
// pass a reference to ctx to cache_flat_mutation_reader
|
|
// keeping its ownership at caller's.
|
|
inline flat_mutation_reader_v2 make_cache_flat_mutation_reader(schema_ptr s,
|
|
dht::decorated_key dk,
|
|
query::clustering_key_filter_ranges crr,
|
|
row_cache& cache,
|
|
cache::read_context& ctx,
|
|
partition_snapshot_ptr snp)
|
|
{
|
|
return make_flat_mutation_reader_v2<cache::cache_flat_mutation_reader>(
|
|
std::move(s), std::move(dk), std::move(crr), ctx, std::move(snp), cache);
|
|
}
|
|
|
|
// transfer ownership of ctx to cache_flat_mutation_reader
|
|
inline flat_mutation_reader_v2 make_cache_flat_mutation_reader(schema_ptr s,
|
|
dht::decorated_key dk,
|
|
query::clustering_key_filter_ranges crr,
|
|
row_cache& cache,
|
|
std::unique_ptr<cache::read_context> unique_ctx,
|
|
partition_snapshot_ptr snp)
|
|
{
|
|
return make_flat_mutation_reader_v2<cache::cache_flat_mutation_reader>(
|
|
std::move(s), std::move(dk), std::move(crr), std::move(unique_ctx), std::move(snp), cache);
|
|
}
|