c628fa4e9e
before this change, `scylla sstable shard-of` didn't support tablets, because: - with tablets enabled, data distribution uses the scheduler - this replaces the previous method of mapping based on vnodes and shard numbers - as a result, we can no longer deduce sstable mapping from token ranges in this change, we: - read `system.tablets` table to retrieve tablet information - print the tablet's replica set (list of <host, shard> pairs) - this helps users determine where a given sstable is hosted This approach provides the closest equivalent functionality of `shard-of` in the tablet era. Fixes scylladb/scylladb#16488 Signed-off-by: Kefu Chai <kefu.chai@scylladb.com>
44 lines
1.2 KiB
C++
44 lines
1.2 KiB
C++
/*
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* Copyright (C) 2024-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 <filesystem>
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#include <map>
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#include <seastar/core/future.hh>
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#include "reader_permit.hh"
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#include "dht/token.hh"
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#include "locator/tablets.hh"
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#include "seastarx.hh"
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namespace db {
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class config;
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}
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namespace tools {
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using tablets_t = std::map<dht::token, locator::tablet_replica_set>;
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/// Load the rows of given table in "system.tablets" from its sstables
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///
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/// @param cfg the db config
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/// @param scylla_data_path path to the scylla data directory, which is usually
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/// /var/lib/scylla/data
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/// @param keyspace_name the keyspace name of the table
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/// @param table_name the table name of the table
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/// @param permit the permit for performing read ops
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/// @returns a map from last token to the replica set
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future<tablets_t> load_system_tablets(const db::config& dbcfg,
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std::filesystem::path scylla_data_path,
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std::string_view keyspace_name,
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std::string_view tablet_name,
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reader_permit permit);
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}
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