From 19fcec84d8d7d21e796c7624e521b60d28ee21ed Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:45:59 +0200 Subject: Adding upstream version 16.2.11+ds. Signed-off-by: Daniel Baumann --- src/rocksdb/db/logs_with_prep_tracker.h | 63 +++++++++++++++++++++++++++++++++ 1 file changed, 63 insertions(+) create mode 100644 src/rocksdb/db/logs_with_prep_tracker.h (limited to 'src/rocksdb/db/logs_with_prep_tracker.h') diff --git a/src/rocksdb/db/logs_with_prep_tracker.h b/src/rocksdb/db/logs_with_prep_tracker.h new file mode 100644 index 000000000..86c88012a --- /dev/null +++ b/src/rocksdb/db/logs_with_prep_tracker.h @@ -0,0 +1,63 @@ +// Copyright (c) 2011-present, Facebook, Inc. All rights reserved. +// This source code is licensed under both the GPLv2 (found in the +// COPYING file in the root directory) and Apache 2.0 License +// (found in the LICENSE.Apache file in the root directory). +// +#pragma once + +#include +#include +#include +#include +#include +#include + +#include "rocksdb/rocksdb_namespace.h" + +namespace ROCKSDB_NAMESPACE { + +// This class is used to track the log files with outstanding prepare entries. +class LogsWithPrepTracker { + public: + // Called when a transaction prepared in `log` has been committed or aborted. + void MarkLogAsHavingPrepSectionFlushed(uint64_t log); + // Called when a transaction is prepared in `log`. + void MarkLogAsContainingPrepSection(uint64_t log); + // Return the earliest log file with outstanding prepare entries. + uint64_t FindMinLogContainingOutstandingPrep(); + size_t TEST_PreparedSectionCompletedSize() { + return prepared_section_completed_.size(); + } + size_t TEST_LogsWithPrepSize() { return logs_with_prep_.size(); } + + private: + // REQUIRES: logs_with_prep_mutex_ held + // + // sorted list of log numbers still containing prepared data. + // this is used by FindObsoleteFiles to determine which + // flushed logs we must keep around because they still + // contain prepared data which has not been committed or rolled back + struct LogCnt { + uint64_t log; // the log number + uint64_t cnt; // number of prepared sections in the log + }; + std::vector logs_with_prep_; + std::mutex logs_with_prep_mutex_; + + // REQUIRES: prepared_section_completed_mutex_ held + // + // to be used in conjunction with logs_with_prep_. + // once a transaction with data in log L is committed or rolled back + // rather than updating logs_with_prep_ directly we keep track of that + // in prepared_section_completed_ which maps LOG -> instance_count. This helps + // avoiding contention between a commit thread and the prepare threads. + // + // when trying to determine the minimum log still active we first + // consult logs_with_prep_. while that root value maps to + // an equal value in prepared_section_completed_ we erase the log from + // both logs_with_prep_ and prepared_section_completed_. + std::unordered_map prepared_section_completed_; + std::mutex prepared_section_completed_mutex_; + +}; +} // namespace ROCKSDB_NAMESPACE -- cgit v1.2.3