fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
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765 lines
27 KiB
765 lines
27 KiB
// Copyright (c) 2014, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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package org.rocksdb;
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public interface DBOptionsInterface {
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/**
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* If this value is set to true, then the database will be created
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* if it is missing during {@code RocksDB.open()}.
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* Default: false
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*
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* @param flag a flag indicating whether to create a database the
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* specified database in {@link RocksDB#open(org.rocksdb.Options, String)} operation
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* is missing.
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* @return the instance of the current Options
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* @see RocksDB#open(org.rocksdb.Options, String)
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*/
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Object setCreateIfMissing(boolean flag);
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/**
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* Return true if the create_if_missing flag is set to true.
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* If true, the database will be created if it is missing.
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*
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* @return true if the createIfMissing option is set to true.
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* @see #setCreateIfMissing(boolean)
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*/
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boolean createIfMissing();
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/**
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* <p>If true, missing column families will be automatically created</p>
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*
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* <p>Default: false</p>
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*
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* @param flag a flag indicating if missing column families shall be
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* created automatically.
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* @return true if missing column families shall be created automatically
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* on open.
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*/
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Object setCreateMissingColumnFamilies(boolean flag);
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/**
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* Return true if the create_missing_column_families flag is set
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* to true. If true column families be created if missing.
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*
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* @return true if the createMissingColumnFamilies is set to
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* true.
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* @see #setCreateMissingColumnFamilies(boolean)
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*/
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boolean createMissingColumnFamilies();
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/**
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* If true, an error will be thrown during RocksDB.open() if the
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* database already exists.
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* Default: false
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*
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* @param errorIfExists if true, an exception will be thrown
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* during {@code RocksDB.open()} if the database already exists.
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* @return the reference to the current option.
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* @see RocksDB#open(org.rocksdb.Options, String)
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*/
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Object setErrorIfExists(boolean errorIfExists);
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/**
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* If true, an error will be thrown during RocksDB.open() if the
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* database already exists.
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*
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* @return if true, an error is raised when the specified database
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* already exists before open.
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*/
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boolean errorIfExists();
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/**
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* If true, the implementation will do aggressive checking of the
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* data it is processing and will stop early if it detects any
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* errors. This may have unforeseen ramifications: for example, a
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* corruption of one DB entry may cause a large number of entries to
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* become unreadable or for the entire DB to become unopenable.
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* If any of the writes to the database fails (Put, Delete, Merge, Write),
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* the database will switch to read-only mode and fail all other
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* Write operations.
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* Default: true
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*
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* @param paranoidChecks a flag to indicate whether paranoid-check
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* is on.
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* @return the reference to the current option.
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*/
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Object setParanoidChecks(boolean paranoidChecks);
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/**
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* If true, the implementation will do aggressive checking of the
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* data it is processing and will stop early if it detects any
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* errors. This may have unforeseen ramifications: for example, a
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* corruption of one DB entry may cause a large number of entries to
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* become unreadable or for the entire DB to become unopenable.
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* If any of the writes to the database fails (Put, Delete, Merge, Write),
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* the database will switch to read-only mode and fail all other
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* Write operations.
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*
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* @return a boolean indicating whether paranoid-check is on.
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*/
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boolean paranoidChecks();
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/**
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* Use to control write rate of flush and compaction. Flush has higher
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* priority than compaction. Rate limiting is disabled if nullptr.
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* Default: nullptr
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*
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* @param config rate limiter config.
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* @return the instance of the current Object.
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*/
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Object setRateLimiterConfig(RateLimiterConfig config);
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/**
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* Number of open files that can be used by the DB. You may need to
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* increase this if your database has a large working set. Value -1 means
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* files opened are always kept open. You can estimate number of files based
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* on {@code target_file_size_base} and {@code target_file_size_multiplier}
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* for level-based compaction. For universal-style compaction, you can usually
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* set it to -1.
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* Default: 5000
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*
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* @param maxOpenFiles the maximum number of open files.
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* @return the reference to the current DBOptions.
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*/
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Object setMaxOpenFiles(int maxOpenFiles);
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/**
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* Number of open files that can be used by the DB. You may need to
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* increase this if your database has a large working set. Value -1 means
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* files opened are always kept open. You can estimate number of files based
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* on {@code target_file_size_base} and {@code target_file_size_multiplier}
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* for level-based compaction. For universal-style compaction, you can usually
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* set it to -1.
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*
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* @return the maximum number of open files.
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*/
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int maxOpenFiles();
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/**
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* <p>Once write-ahead logs exceed this size, we will start forcing the
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* flush of column families whose memtables are backed by the oldest live
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* WAL file (i.e. the ones that are causing all the space amplification).
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* </p>
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* <p>If set to 0 (default), we will dynamically choose the WAL size limit to
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* be [sum of all write_buffer_size * max_write_buffer_number] * 2</p>
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* <p>Default: 0</p>
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*/
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Object setMaxTotalWalSize(long maxTotalWalSize);
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/**
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* <p>Returns the max total wal size. Once write-ahead logs exceed this size,
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* we will start forcing the flush of column families whose memtables are
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* backed by the oldest live WAL file (i.e. the ones that are causing all
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* the space amplification).</p>
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*
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* <p>If set to 0 (default), we will dynamically choose the WAL size limit
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* to be [sum of all write_buffer_size * max_write_buffer_number] * 2
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* </p>
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*
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* @return max total wal size
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*/
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long maxTotalWalSize();
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/**
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* <p>Creates statistics object which collects metrics about database operations.
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* Statistics objects should not be shared between DB instances as
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* it does not use any locks to prevent concurrent updates.</p>
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*
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* @return the instance of the current Object.
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* @see RocksDB#open(org.rocksdb.Options, String)
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*/
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Object createStatistics();
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/**
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* <p>Returns statistics object. Calls {@link #createStatistics()} if
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* C++ returns {@code nullptr} for statistics.</p>
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*
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* @return the instance of the statistics object.
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* @see #createStatistics()
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*/
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Statistics statisticsPtr();
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/**
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* <p>If true, then the contents of manifest and data files are
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* not synced to stable storage. Their contents remain in the
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* OS buffers till theOS decides to flush them.</p>
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*
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* <p>This option is good for bulk-loading of data.</p>
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*
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* <p>Once the bulk-loading is complete, please issue a sync to
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* the OS to flush all dirty buffers to stable storage.</p>
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*
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* <p>Default: false</p>
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*
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* @param disableDataSync a boolean flag to specify whether to
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* disable data sync.
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* @return the reference to the current DBOptions.
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*/
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Object setDisableDataSync(boolean disableDataSync);
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/**
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* If true, then the contents of data files are not synced
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* to stable storage. Their contents remain in the OS buffers till the
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* OS decides to flush them. This option is good for bulk-loading
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* of data. Once the bulk-loading is complete, please issue a
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* sync to the OS to flush all dirty buffers to stable storage.
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*
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* @return if true, then data-sync is disabled.
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*/
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boolean disableDataSync();
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/**
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* <p>If true, then every store to stable storage will issue a fsync.</p>
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* <p>If false, then every store to stable storage will issue a fdatasync.
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* This parameter should be set to true while storing data to
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* filesystem like ext3 that can lose files after a reboot.</p>
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* <p>Default: false</p>
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*
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* @param useFsync a boolean flag to specify whether to use fsync
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* @return the instance of the current Object.
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*/
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Object setUseFsync(boolean useFsync);
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/**
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* <p>If true, then every store to stable storage will issue a fsync.</p>
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* <p>If false, then every store to stable storage will issue a fdatasync.
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* This parameter should be set to true while storing data to
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* filesystem like ext3 that can lose files after a reboot.</p>
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*
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* @return boolean value indicating if fsync is used.
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*/
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boolean useFsync();
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/**
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* This specifies the info LOG dir.
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* If it is empty, the log files will be in the same dir as data.
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* If it is non empty, the log files will be in the specified dir,
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* and the db data dir's absolute path will be used as the log file
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* name's prefix.
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*
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* @param dbLogDir the path to the info log directory
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* @return the instance of the current Object.
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*/
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Object setDbLogDir(String dbLogDir);
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/**
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* Returns the directory of info log.
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*
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* If it is empty, the log files will be in the same dir as data.
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* If it is non empty, the log files will be in the specified dir,
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* and the db data dir's absolute path will be used as the log file
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* name's prefix.
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*
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* @return the path to the info log directory
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*/
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String dbLogDir();
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/**
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* This specifies the absolute dir path for write-ahead logs (WAL).
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* If it is empty, the log files will be in the same dir as data,
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* dbname is used as the data dir by default
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* If it is non empty, the log files will be in kept the specified dir.
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* When destroying the db,
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* all log files in wal_dir and the dir itself is deleted
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*
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* @param walDir the path to the write-ahead-log directory.
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* @return the instance of the current Object.
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*/
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Object setWalDir(String walDir);
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/**
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* Returns the path to the write-ahead-logs (WAL) directory.
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*
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* If it is empty, the log files will be in the same dir as data,
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* dbname is used as the data dir by default
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* If it is non empty, the log files will be in kept the specified dir.
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* When destroying the db,
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* all log files in wal_dir and the dir itself is deleted
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*
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* @return the path to the write-ahead-logs (WAL) directory.
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*/
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String walDir();
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/**
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* The periodicity when obsolete files get deleted. The default
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* value is 6 hours. The files that get out of scope by compaction
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* process will still get automatically delete on every compaction,
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* regardless of this setting
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*
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* @param micros the time interval in micros
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* @return the instance of the current Object.
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*/
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Object setDeleteObsoleteFilesPeriodMicros(long micros);
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/**
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* The periodicity when obsolete files get deleted. The default
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* value is 6 hours. The files that get out of scope by compaction
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* process will still get automatically delete on every compaction,
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* regardless of this setting
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*
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* @return the time interval in micros when obsolete files will be deleted.
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*/
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long deleteObsoleteFilesPeriodMicros();
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/**
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* Specifies the maximum number of concurrent background compaction jobs,
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* submitted to the default LOW priority thread pool.
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* If you're increasing this, also consider increasing number of threads in
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* LOW priority thread pool. For more information, see
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* Default: 1
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*
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* @param maxBackgroundCompactions the maximum number of background
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* compaction jobs.
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* @return the instance of the current Object.
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*
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* @see RocksEnv#setBackgroundThreads(int)
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* @see RocksEnv#setBackgroundThreads(int, int)
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* @see #maxBackgroundFlushes()
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*/
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Object setMaxBackgroundCompactions(int maxBackgroundCompactions);
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/**
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* Returns the maximum number of concurrent background compaction jobs,
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* submitted to the default LOW priority thread pool.
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* When increasing this number, we may also want to consider increasing
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* number of threads in LOW priority thread pool.
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* Default: 1
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*
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* @return the maximum number of concurrent background compaction jobs.
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* @see RocksEnv#setBackgroundThreads(int)
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* @see RocksEnv#setBackgroundThreads(int, int)
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*/
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int maxBackgroundCompactions();
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/**
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* Specifies the maximum number of concurrent background flush jobs.
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* If you're increasing this, also consider increasing number of threads in
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* HIGH priority thread pool. For more information, see
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* Default: 1
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*
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* @param maxBackgroundFlushes number of max concurrent flush jobs
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* @return the instance of the current Object.
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*
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* @see RocksEnv#setBackgroundThreads(int)
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* @see RocksEnv#setBackgroundThreads(int, int)
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* @see #maxBackgroundCompactions()
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*/
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Object setMaxBackgroundFlushes(int maxBackgroundFlushes);
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/**
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* Returns the maximum number of concurrent background flush jobs.
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* If you're increasing this, also consider increasing number of threads in
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* HIGH priority thread pool. For more information, see
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* Default: 1
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*
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* @return the maximum number of concurrent background flush jobs.
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* @see RocksEnv#setBackgroundThreads(int)
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* @see RocksEnv#setBackgroundThreads(int, int)
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*/
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int maxBackgroundFlushes();
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/**
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* Specifies the maximum size of a info log file. If the current log file
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* is larger than `max_log_file_size`, a new info log file will
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* be created.
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* If 0, all logs will be written to one log file.
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*
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* @param maxLogFileSize the maximum size of a info log file.
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* @return the instance of the current Object.
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* @throws org.rocksdb.RocksDBException
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*/
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Object setMaxLogFileSize(long maxLogFileSize)
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throws RocksDBException;
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/**
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* Returns the maximum size of a info log file. If the current log file
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* is larger than this size, a new info log file will be created.
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* If 0, all logs will be written to one log file.
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*
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* @return the maximum size of the info log file.
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*/
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long maxLogFileSize();
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/**
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* Specifies the time interval for the info log file to roll (in seconds).
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* If specified with non-zero value, log file will be rolled
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* if it has been active longer than `log_file_time_to_roll`.
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* Default: 0 (disabled)
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*
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* @param logFileTimeToRoll the time interval in seconds.
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* @return the instance of the current Object.
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* @throws org.rocksdb.RocksDBException
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*/
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Object setLogFileTimeToRoll(long logFileTimeToRoll)
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throws RocksDBException;
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/**
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* Returns the time interval for the info log file to roll (in seconds).
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* If specified with non-zero value, log file will be rolled
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* if it has been active longer than `log_file_time_to_roll`.
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* Default: 0 (disabled)
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*
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* @return the time interval in seconds.
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*/
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long logFileTimeToRoll();
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/**
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* Specifies the maximum number of info log files to be kept.
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* Default: 1000
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*
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* @param keepLogFileNum the maximum number of info log files to be kept.
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* @return the instance of the current Object.
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* @throws org.rocksdb.RocksDBException
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*/
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Object setKeepLogFileNum(long keepLogFileNum)
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throws RocksDBException;
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/**
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* Returns the maximum number of info log files to be kept.
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* Default: 1000
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*
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* @return the maximum number of info log files to be kept.
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*/
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long keepLogFileNum();
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/**
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* Manifest file is rolled over on reaching this limit.
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* The older manifest file be deleted.
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* The default value is MAX_INT so that roll-over does not take place.
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*
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* @param maxManifestFileSize the size limit of a manifest file.
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* @return the instance of the current Object.
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*/
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Object setMaxManifestFileSize(long maxManifestFileSize);
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/**
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* Manifest file is rolled over on reaching this limit.
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* The older manifest file be deleted.
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* The default value is MAX_INT so that roll-over does not take place.
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*
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* @return the size limit of a manifest file.
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*/
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long maxManifestFileSize();
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/**
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* Number of shards used for table cache.
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*
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* @param tableCacheNumshardbits the number of chards
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* @return the instance of the current Object.
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*/
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Object setTableCacheNumshardbits(int tableCacheNumshardbits);
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/**
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* Number of shards used for table cache.
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*
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* @return the number of shards used for table cache.
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*/
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int tableCacheNumshardbits();
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/**
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* During data eviction of table's LRU cache, it would be inefficient
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* to strictly follow LRU because this piece of memory will not really
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* be released unless its refcount falls to zero. Instead, make two
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* passes: the first pass will release items with refcount = 1,
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* and if not enough space releases after scanning the number of
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* elements specified by this parameter, we will remove items in LRU
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* order.
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*
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* @param limit scan count limit
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* @return the instance of the current Object.
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*/
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Object setTableCacheRemoveScanCountLimit(int limit);
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/**
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* During data eviction of table's LRU cache, it would be inefficient
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* to strictly follow LRU because this piece of memory will not really
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* be released unless its refcount falls to zero. Instead, make two
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* passes: the first pass will release items with refcount = 1,
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* and if not enough space releases after scanning the number of
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* elements specified by this parameter, we will remove items in LRU
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* order.
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*
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* @return scan count limit
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*/
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int tableCacheRemoveScanCountLimit();
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/**
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* {@link #walTtlSeconds()} and {@link #walSizeLimitMB()} affect how archived logs
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* will be deleted.
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* <ol>
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* <li>If both set to 0, logs will be deleted asap and will not get into
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* the archive.</li>
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* <li>If WAL_ttl_seconds is 0 and WAL_size_limit_MB is not 0,
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* WAL files will be checked every 10 min and if total size is greater
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* then WAL_size_limit_MB, they will be deleted starting with the
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* earliest until size_limit is met. All empty files will be deleted.</li>
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* <li>If WAL_ttl_seconds is not 0 and WAL_size_limit_MB is 0, then
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* WAL files will be checked every WAL_ttl_secondsi / 2 and those that
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* are older than WAL_ttl_seconds will be deleted.</li>
|
|
* <li>If both are not 0, WAL files will be checked every 10 min and both
|
|
* checks will be performed with ttl being first.</li>
|
|
* </ol>
|
|
*
|
|
* @param walTtlSeconds the ttl seconds
|
|
* @return the instance of the current Object.
|
|
* @see #setWalSizeLimitMB(long)
|
|
*/
|
|
Object setWalTtlSeconds(long walTtlSeconds);
|
|
|
|
/**
|
|
* WalTtlSeconds() and walSizeLimitMB() affect how archived logs
|
|
* will be deleted.
|
|
* <ol>
|
|
* <li>If both set to 0, logs will be deleted asap and will not get into
|
|
* the archive.</li>
|
|
* <li>If WAL_ttl_seconds is 0 and WAL_size_limit_MB is not 0,
|
|
* WAL files will be checked every 10 min and if total size is greater
|
|
* then WAL_size_limit_MB, they will be deleted starting with the
|
|
* earliest until size_limit is met. All empty files will be deleted.</li>
|
|
* <li>If WAL_ttl_seconds is not 0 and WAL_size_limit_MB is 0, then
|
|
* WAL files will be checked every WAL_ttl_secondsi / 2 and those that
|
|
* are older than WAL_ttl_seconds will be deleted.</li>
|
|
* <li>If both are not 0, WAL files will be checked every 10 min and both
|
|
* checks will be performed with ttl being first.</li>
|
|
* </ol>
|
|
*
|
|
* @return the wal-ttl seconds
|
|
* @see #walSizeLimitMB()
|
|
*/
|
|
long walTtlSeconds();
|
|
|
|
/**
|
|
* WalTtlSeconds() and walSizeLimitMB() affect how archived logs
|
|
* will be deleted.
|
|
* <ol>
|
|
* <li>If both set to 0, logs will be deleted asap and will not get into
|
|
* the archive.</li>
|
|
* <li>If WAL_ttl_seconds is 0 and WAL_size_limit_MB is not 0,
|
|
* WAL files will be checked every 10 min and if total size is greater
|
|
* then WAL_size_limit_MB, they will be deleted starting with the
|
|
* earliest until size_limit is met. All empty files will be deleted.</li>
|
|
* <li>If WAL_ttl_seconds is not 0 and WAL_size_limit_MB is 0, then
|
|
* WAL files will be checked every WAL_ttl_secondsi / 2 and those that
|
|
* are older than WAL_ttl_seconds will be deleted.</li>
|
|
* <li>If both are not 0, WAL files will be checked every 10 min and both
|
|
* checks will be performed with ttl being first.</li>
|
|
* </ol>
|
|
*
|
|
* @param sizeLimitMB size limit in mega-bytes.
|
|
* @return the instance of the current Object.
|
|
* @see #setWalSizeLimitMB(long)
|
|
*/
|
|
Object setWalSizeLimitMB(long sizeLimitMB);
|
|
|
|
/**
|
|
* {@link #walTtlSeconds()} and {@code #walSizeLimitMB()} affect how archived logs
|
|
* will be deleted.
|
|
* <ol>
|
|
* <li>If both set to 0, logs will be deleted asap and will not get into
|
|
* the archive.</li>
|
|
* <li>If WAL_ttl_seconds is 0 and WAL_size_limit_MB is not 0,
|
|
* WAL files will be checked every 10 min and if total size is greater
|
|
* then WAL_size_limit_MB, they will be deleted starting with the
|
|
* earliest until size_limit is met. All empty files will be deleted.</li>
|
|
* <li>If WAL_ttl_seconds is not 0 and WAL_size_limit_MB is 0, then
|
|
* WAL files will be checked every WAL_ttl_seconds i / 2 and those that
|
|
* are older than WAL_ttl_seconds will be deleted.</li>
|
|
* <li>If both are not 0, WAL files will be checked every 10 min and both
|
|
* checks will be performed with ttl being first.</li>
|
|
* </ol>
|
|
* @return size limit in mega-bytes.
|
|
* @see #walSizeLimitMB()
|
|
*/
|
|
long walSizeLimitMB();
|
|
|
|
/**
|
|
* Number of bytes to preallocate (via fallocate) the manifest
|
|
* files. Default is 4mb, which is reasonable to reduce random IO
|
|
* as well as prevent overallocation for mounts that preallocate
|
|
* large amounts of data (such as xfs's allocsize option).
|
|
*
|
|
* @param size the size in byte
|
|
* @return the instance of the current Object.
|
|
* @throws org.rocksdb.RocksDBException
|
|
*/
|
|
Object setManifestPreallocationSize(long size)
|
|
throws RocksDBException;
|
|
|
|
/**
|
|
* Number of bytes to preallocate (via fallocate) the manifest
|
|
* files. Default is 4mb, which is reasonable to reduce random IO
|
|
* as well as prevent overallocation for mounts that preallocate
|
|
* large amounts of data (such as xfs's allocsize option).
|
|
*
|
|
* @return size in bytes.
|
|
*/
|
|
long manifestPreallocationSize();
|
|
|
|
/**
|
|
* Data being read from file storage may be buffered in the OS
|
|
* Default: true
|
|
*
|
|
* @param allowOsBuffer if true, then OS buffering is allowed.
|
|
* @return the instance of the current Object.
|
|
*/
|
|
Object setAllowOsBuffer(boolean allowOsBuffer);
|
|
|
|
/**
|
|
* Data being read from file storage may be buffered in the OS
|
|
* Default: true
|
|
*
|
|
* @return if true, then OS buffering is allowed.
|
|
*/
|
|
boolean allowOsBuffer();
|
|
|
|
/**
|
|
* Allow the OS to mmap file for reading sst tables.
|
|
* Default: false
|
|
*
|
|
* @param allowMmapReads true if mmap reads are allowed.
|
|
* @return the instance of the current Object.
|
|
*/
|
|
Object setAllowMmapReads(boolean allowMmapReads);
|
|
|
|
/**
|
|
* Allow the OS to mmap file for reading sst tables.
|
|
* Default: false
|
|
*
|
|
* @return true if mmap reads are allowed.
|
|
*/
|
|
boolean allowMmapReads();
|
|
|
|
/**
|
|
* Allow the OS to mmap file for writing. Default: false
|
|
*
|
|
* @param allowMmapWrites true if mmap writes are allowd.
|
|
* @return the instance of the current Object.
|
|
*/
|
|
Object setAllowMmapWrites(boolean allowMmapWrites);
|
|
|
|
/**
|
|
* Allow the OS to mmap file for writing. Default: false
|
|
*
|
|
* @return true if mmap writes are allowed.
|
|
*/
|
|
boolean allowMmapWrites();
|
|
|
|
/**
|
|
* Disable child process inherit open files. Default: true
|
|
*
|
|
* @param isFdCloseOnExec true if child process inheriting open
|
|
* files is disabled.
|
|
* @return the instance of the current Object.
|
|
*/
|
|
Object setIsFdCloseOnExec(boolean isFdCloseOnExec);
|
|
|
|
/**
|
|
* Disable child process inherit open files. Default: true
|
|
*
|
|
* @return true if child process inheriting open files is disabled.
|
|
*/
|
|
boolean isFdCloseOnExec();
|
|
|
|
/**
|
|
* Skip log corruption error on recovery (If client is ok with
|
|
* losing most recent changes)
|
|
* Default: false
|
|
*
|
|
* @param skip true if log corruption errors are skipped during recovery.
|
|
* @return the instance of the current Object.
|
|
*/
|
|
Object setSkipLogErrorOnRecovery(boolean skip);
|
|
|
|
/**
|
|
* Skip log corruption error on recovery (If client is ok with
|
|
* losing most recent changes)
|
|
* Default: false
|
|
*
|
|
* @return true if log corruption errors are skipped during recovery.
|
|
*/
|
|
boolean skipLogErrorOnRecovery();
|
|
|
|
/**
|
|
* if not zero, dump rocksdb.stats to LOG every stats_dump_period_sec
|
|
* Default: 3600 (1 hour)
|
|
*
|
|
* @param statsDumpPeriodSec time interval in seconds.
|
|
* @return the instance of the current Object.
|
|
*/
|
|
Object setStatsDumpPeriodSec(int statsDumpPeriodSec);
|
|
|
|
/**
|
|
* If not zero, dump rocksdb.stats to LOG every stats_dump_period_sec
|
|
* Default: 3600 (1 hour)
|
|
*
|
|
* @return time interval in seconds.
|
|
*/
|
|
int statsDumpPeriodSec();
|
|
|
|
/**
|
|
* If set true, will hint the underlying file system that the file
|
|
* access pattern is random, when a sst file is opened.
|
|
* Default: true
|
|
*
|
|
* @param adviseRandomOnOpen true if hinting random access is on.
|
|
* @return the instance of the current Object.
|
|
*/
|
|
Object setAdviseRandomOnOpen(boolean adviseRandomOnOpen);
|
|
|
|
/**
|
|
* If set true, will hint the underlying file system that the file
|
|
* access pattern is random, when a sst file is opened.
|
|
* Default: true
|
|
*
|
|
* @return true if hinting random access is on.
|
|
*/
|
|
boolean adviseRandomOnOpen();
|
|
|
|
/**
|
|
* Use adaptive mutex, which spins in the user space before resorting
|
|
* to kernel. This could reduce context switch when the mutex is not
|
|
* heavily contended. However, if the mutex is hot, we could end up
|
|
* wasting spin time.
|
|
* Default: false
|
|
*
|
|
* @param useAdaptiveMutex true if adaptive mutex is used.
|
|
* @return the instance of the current Object.
|
|
*/
|
|
Object setUseAdaptiveMutex(boolean useAdaptiveMutex);
|
|
|
|
/**
|
|
* Use adaptive mutex, which spins in the user space before resorting
|
|
* to kernel. This could reduce context switch when the mutex is not
|
|
* heavily contended. However, if the mutex is hot, we could end up
|
|
* wasting spin time.
|
|
* Default: false
|
|
*
|
|
* @return true if adaptive mutex is used.
|
|
*/
|
|
boolean useAdaptiveMutex();
|
|
|
|
/**
|
|
* Allows OS to incrementally sync files to disk while they are being
|
|
* written, asynchronously, in the background.
|
|
* Issue one request for every bytes_per_sync written. 0 turns it off.
|
|
* Default: 0
|
|
*
|
|
* @param bytesPerSync size in bytes
|
|
* @return the instance of the current Object.
|
|
*/
|
|
Object setBytesPerSync(long bytesPerSync);
|
|
|
|
/**
|
|
* Allows OS to incrementally sync files to disk while they are being
|
|
* written, asynchronously, in the background.
|
|
* Issue one request for every bytes_per_sync written. 0 turns it off.
|
|
* Default: 0
|
|
*
|
|
* @return size in bytes
|
|
*/
|
|
long bytesPerSync();
|
|
}
|
|
|