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Diffstat (limited to 'src/mongo/db/snapshot_window_options.h')
| -rw-r--r-- | src/mongo/db/snapshot_window_options.h | 64 |
1 files changed, 0 insertions, 64 deletions
diff --git a/src/mongo/db/snapshot_window_options.h b/src/mongo/db/snapshot_window_options.h deleted file mode 100644 index dafeee5b28e..00000000000 --- a/src/mongo/db/snapshot_window_options.h +++ /dev/null @@ -1,64 +0,0 @@ -/** - * Copyright (C) 2018-present MongoDB, Inc. - * - * This program is free software: you can redistribute it and/or modify - * it under the terms of the Server Side Public License, version 1, - * as published by MongoDB, Inc. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * Server Side Public License for more details. - * - * You should have received a copy of the Server Side Public License - * along with this program. If not, see - * <http://www.mongodb.com/licensing/server-side-public-license>. - * - * As a special exception, the copyright holders give permission to link the - * code of portions of this program with the OpenSSL library under certain - * conditions as described in each individual source file and distribute - * linked combinations including the program with the OpenSSL library. You - * must comply with the Server Side Public License in all respects for - * all of the code used other than as permitted herein. If you modify file(s) - * with this exception, you may extend this exception to your version of the - * file(s), but you are not obligated to do so. If you do not wish to do so, - * delete this exception statement from your version. If you delete this - * exception statement from all source files in the program, then also delete - * it in the license file. - */ - -#pragma once - -#include "mongo/idl/mutable_observer_registry.h" -#include "mongo/platform/atomic_proxy.h" -#include "mongo/platform/atomic_word.h" - -namespace mongo { - -/** - * These are parameters that affect how much snapshot history the storage engine will keep to - * support snapshot reads. This is referred to as the snapshot window. The window is between the - * stable timestamp and the oldest timestamp. - */ -struct SnapshotWindowParams { - - // minSnapshotHistoryWindowInSeconds (startup & runtime server parameter, range 0+). - // - // Dictates the lag in seconds oldest_timestamp should be set behind stable_timestamp. - // - // Note that the window size can become greater than this if an ongoing operation is holding an - // older snapshot open. - AtomicWord<int> minSnapshotHistoryWindowInSeconds{5}; - - // cachePressureThreshold (startup & runtime server parameter, range [0, 100]). - // - // Compares against a storage engine cache pressure indicator that ranges from 0 to 100. - // Currently, the only indicator is the WT lookaside score. - AtomicWord<int> cachePressureThreshold{95}; - - AtomicWord<std::int64_t> snapshotTooOldErrorCount{0}; -}; - -extern SnapshotWindowParams snapshotWindowParams; - -} // namespace mongo |