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acf7bedad4
In order to process paged queries with per-partition limits properly, paging state needs to keep additional information: what was the row count of last partition returned in previous run. That's necessary because the end of previous page and the beginning of current one might consist of rows with the same partition key and we need to be able to trim the results to the number indicated by per-partition limit.
104 lines
3.8 KiB
C++
104 lines
3.8 KiB
C++
/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* Copyright (C) 2015 ScyllaDB
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*
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* Modified by 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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#include "bytes.hh"
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#include "keys.hh"
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#include "paging_state.hh"
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#include <seastar/core/simple-stream.hh>
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#include "idl/keys.dist.hh"
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#include "idl/uuid.dist.hh"
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#include "idl/paging_state.dist.hh"
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#include "idl/token.dist.hh"
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#include "idl/range.dist.hh"
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#include "serializer_impl.hh"
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#include "idl/keys.dist.impl.hh"
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#include "idl/uuid.dist.impl.hh"
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#include "idl/paging_state.dist.impl.hh"
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#include "idl/token.dist.impl.hh"
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#include "idl/range.dist.impl.hh"
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#include "message/messaging_service.hh"
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service::pager::paging_state::paging_state(partition_key pk,
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std::optional<clustering_key> ck,
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uint32_t rem,
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utils::UUID query_uuid,
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replicas_per_token_range last_replicas,
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std::optional<db::read_repair_decision> query_read_repair_decision,
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uint32_t rows_fetched_for_last_partition)
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: _partition_key(std::move(pk))
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, _clustering_key(std::move(ck))
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, _remaining(rem)
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, _query_uuid(query_uuid)
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, _last_replicas(std::move(last_replicas))
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, _query_read_repair_decision(query_read_repair_decision)
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, _rows_fetched_for_last_partition(rows_fetched_for_last_partition) {
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}
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::shared_ptr<service::pager::paging_state> service::pager::paging_state::deserialize(
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bytes_opt data) {
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if (!data) {
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return nullptr;
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}
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if (data.value().size() < sizeof(uint32_t) || le_to_cpu(*unaligned_cast<int32_t*>(data.value().begin())) != netw::messaging_service::current_version) {
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throw exceptions::protocol_exception("Invalid value for the paging state");
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}
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// skip 4 bytes that contain format id
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seastar::simple_input_stream in(reinterpret_cast<char*>(data.value().begin() + sizeof(uint32_t)), data.value().size() - sizeof(uint32_t));
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try {
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return ::make_shared<paging_state>(ser::deserialize(in, boost::type<paging_state>()));
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} catch (...) {
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std::throw_with_nested(
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exceptions::protocol_exception(
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"Invalid value for the paging state"));
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}
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}
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bytes_opt service::pager::paging_state::serialize() const {
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bytes b = ser::serialize_to_buffer<bytes>(*this, sizeof(uint32_t));
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// put serialization format id
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*unaligned_cast<int32_t*>(b.begin()) = cpu_to_le(netw::messaging_service::current_version);
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return {std::move(b)};
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}
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