fa284f6307
This patch adds the parameter to read_command which is needed for caching of readers during multiple pages of a paged queries, which we will introduce in the next patches. The query_uuid is a UUID of a previously saved reader, which the replica is now asked to recall and resume (if this saved reader is no longer in the cache, it is fine, a new reader will be started). Additionally a helper flag is_first_page is added so that the replica can avoid doing any cache lookups (and incrementing miss counters) for the first page. Signed-off-by: Nadav Har'El <nyh@scylladb.com>
56 lines
1.8 KiB
C++
56 lines
1.8 KiB
C++
/*
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* Copyright 2016 ScyllaDB
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*/
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/*
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* This file is part of Scylla.
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*
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* Scylla is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Scylla is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Scylla. If not, see <http://www.gnu.org/licenses/>.
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*/
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class cql_serialization_format final {
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uint8_t protocol_version();
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};
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namespace query {
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class specific_ranges {
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partition_key pk();
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std::vector<nonwrapping_range<clustering_key_prefix>> ranges();
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};
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class partition_slice {
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std::vector<nonwrapping_range<clustering_key_prefix>> default_row_ranges();
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std::vector<uint32_t> static_columns;
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std::vector<uint32_t> regular_columns;
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query::partition_slice::option_set options;
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std::unique_ptr<query::specific_ranges> get_specific_ranges();
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cql_serialization_format cql_format();
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uint32_t partition_row_limit() [[version 1.3]] = std::numeric_limits<uint32_t>::max();
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};
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class read_command {
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utils::UUID cf_id;
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utils::UUID schema_version;
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query::partition_slice slice;
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uint32_t row_limit;
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std::chrono::time_point<gc_clock, gc_clock::duration> timestamp;
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std::experimental::optional<tracing::trace_info> trace_info [[version 1.3]];
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uint32_t partition_limit [[version 1.3]] = std::numeric_limits<uint32_t>::max();
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utils::UUID query_uuid [[version 2.2]] = utils::UUID();
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bool is_first_page [[version 2.2]] = false;
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};
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}
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