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// 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).
package org.rocksdb;
import java.util.Collection;
import java.util.List;
public interface ColumnFamilyOptionsInterface>
extends AdvancedColumnFamilyOptionsInterface {
/**
* The function recovers options to a previous version. Only 4.6 or later
* versions are supported.
*
* @param majorVersion The major version to recover default values of options
* @param minorVersion The minor version to recover default values of options
* @return the instance of the current object.
*/
T oldDefaults(int majorVersion, int minorVersion);
/**
* Use this if your DB is very small (like under 1GB) and you don't want to
* spend lots of memory for memtables.
*
* @return the instance of the current object.
*/
T optimizeForSmallDb();
/**
* Some functions that make it easier to optimize RocksDB
* Use this if your DB is very small (like under 1GB) and you don't want to
* spend lots of memory for memtables.
*
* @param cache An optional cache object is passed in to be used as the block cache
* @return the instance of the current object.
*/
T optimizeForSmallDb(Cache cache);
/**
* Use this if you don't need to keep the data sorted, i.e. you'll never use
* an iterator, only Put() and Get() API calls
*
* @param blockCacheSizeMb Block cache size in MB
* @return the instance of the current object.
*/
T optimizeForPointLookup(long blockCacheSizeMb);
/**
* Default values for some parameters in ColumnFamilyOptions are not
* optimized for heavy workloads and big datasets, which means you might
* observe write stalls under some conditions. As a starting point for tuning
* RocksDB options, use the following for level style compaction.
*
* Make sure to also call IncreaseParallelism(), which will provide the
* biggest performance gains.
* Note: we might use more memory than memtable_memory_budget during high
* write rate period
*
* @return the instance of the current object.
*/
T optimizeLevelStyleCompaction();
/**
* Default values for some parameters in ColumnFamilyOptions are not
* optimized for heavy workloads and big datasets, which means you might
* observe write stalls under some conditions. As a starting point for tuning
* RocksDB options, use the following for level style compaction.
*
* Make sure to also call IncreaseParallelism(), which will provide the
* biggest performance gains.
* Note: we might use more memory than memtable_memory_budget during high
* write rate period
*
* @param memtableMemoryBudget memory budget in bytes
* @return the instance of the current object.
*/
T optimizeLevelStyleCompaction(
long memtableMemoryBudget);
/**
* Default values for some parameters in ColumnFamilyOptions are not
* optimized for heavy workloads and big datasets, which means you might
* observe write stalls under some conditions. As a starting point for tuning
* RocksDB options, use the following for universal style compaction.
*
* Universal style compaction is focused on reducing Write Amplification
* Factor for big data sets, but increases Space Amplification.
*
* Make sure to also call IncreaseParallelism(), which will provide the
* biggest performance gains.
*
* Note: we might use more memory than memtable_memory_budget during high
* write rate period
*
* @return the instance of the current object.
*/
T optimizeUniversalStyleCompaction();
/**
* Default values for some parameters in ColumnFamilyOptions are not
* optimized for heavy workloads and big datasets, which means you might
* observe write stalls under some conditions. As a starting point for tuning
* RocksDB options, use the following for universal style compaction.
*
* Universal style compaction is focused on reducing Write Amplification
* Factor for big data sets, but increases Space Amplification.
*
* Make sure to also call IncreaseParallelism(), which will provide the
* biggest performance gains.
*
* Note: we might use more memory than memtable_memory_budget during high
* write rate period
*
* @param memtableMemoryBudget memory budget in bytes
* @return the instance of the current object.
*/
T optimizeUniversalStyleCompaction(
long memtableMemoryBudget);
/**
* Set {@link BuiltinComparator} to be used with RocksDB.
*
* Note: Comparator can be set once upon database creation.
*
* Default: BytewiseComparator.
* @param builtinComparator a {@link BuiltinComparator} type.
* @return the instance of the current object.
*/
T setComparator(
BuiltinComparator builtinComparator);
/**
* Use the specified comparator for key ordering.
*
* Comparator should not be disposed before options instances using this comparator is
* disposed. If dispose() function is not called, then comparator object will be
* GC'd automatically.
*
* Comparator instance can be re-used in multiple options instances.
*
* @param comparator java instance.
* @return the instance of the current object.
*/
T setComparator(
AbstractComparator comparator);
/**
*
Set the merge operator to be used for merging two merge operands
* of the same key. The merge function is invoked during
* compaction and at lookup time, if multiple key/value pairs belonging
* to the same key are found in the database.
*
* @param name the name of the merge function, as defined by
* the MergeOperators factory (see utilities/MergeOperators.h)
* The merge function is specified by name and must be one of the
* standard merge operators provided by RocksDB. The available
* operators are "put", "uint64add", "stringappend" and "stringappendtest".
* @return the instance of the current object.
*/
T setMergeOperatorName(String name);
/**
* Set the merge operator to be used for merging two different key/value
* pairs that share the same key. The merge function is invoked during
* compaction and at lookup time, if multiple key/value pairs belonging
* to the same key are found in the database.
*
* @param mergeOperator {@link MergeOperator} instance.
* @return the instance of the current object.
*/
T setMergeOperator(MergeOperator mergeOperator);
/**
* A single CompactionFilter instance to call into during compaction.
* Allows an application to modify/delete a key-value during background
* compaction.
*
* If the client requires a new compaction filter to be used for different
* compaction runs, it can specify call
* {@link #setCompactionFilterFactory(AbstractCompactionFilterFactory)}
* instead.
*
* The client should specify only set one of the two.
* {#setCompactionFilter(AbstractCompactionFilter)} takes precedence
* over {@link #setCompactionFilterFactory(AbstractCompactionFilterFactory)}
* if the client specifies both.
*
* If multithreaded compaction is being used, the supplied CompactionFilter
* instance may be used from different threads concurrently and so should be thread-safe.
*
* @param compactionFilter {@link AbstractCompactionFilter} instance.
* @return the instance of the current object.
*/
T setCompactionFilter(
final AbstractCompactionFilter> compactionFilter);
/**
* Accessor for the CompactionFilter instance in use.
*
* @return Reference to the CompactionFilter, or null if one hasn't been set.
*/
AbstractCompactionFilter> compactionFilter();
/**
* This is a factory that provides {@link AbstractCompactionFilter} objects
* which allow an application to modify/delete a key-value during background
* compaction.
*
* A new filter will be created on each compaction run. If multithreaded
* compaction is being used, each created CompactionFilter will only be used
* from a single thread and so does not need to be thread-safe.
*
* @param compactionFilterFactory {@link AbstractCompactionFilterFactory} instance.
* @return the instance of the current object.
*/
T setCompactionFilterFactory(
final AbstractCompactionFilterFactory>
compactionFilterFactory);
/**
* Accessor for the CompactionFilterFactory instance in use.
*
* @return Reference to the CompactionFilterFactory, or null if one hasn't been set.
*/
AbstractCompactionFilterFactory> compactionFilterFactory();
/**
* This prefix-extractor uses the first n bytes of a key as its prefix.
*
* In some hash-based memtable representation such as HashLinkedList
* and HashSkipList, prefixes are used to partition the keys into
* several buckets. Prefix extractor is used to specify how to
* extract the prefix given a key.
*
* @param n use the first n bytes of a key as its prefix.
* @return the reference to the current option.
*/
T useFixedLengthPrefixExtractor(int n);
/**
* Same as fixed length prefix extractor, except that when slice is
* shorter than the fixed length, it will use the full key.
*
* @param n use the first n bytes of a key as its prefix.
* @return the reference to the current option.
*/
T useCappedPrefixExtractor(int n);
/**
* Number of files to trigger level-0 compaction. A value < 0 means that
* level-0 compaction will not be triggered by number of files at all.
* Default: 4
*
* @param numFiles the number of files in level-0 to trigger compaction.
* @return the reference to the current option.
*/
T setLevelZeroFileNumCompactionTrigger(
int numFiles);
/**
* The number of files in level 0 to trigger compaction from level-0 to
* level-1. A value < 0 means that level-0 compaction will not be
* triggered by number of files at all.
* Default: 4
*
* @return the number of files in level 0 to trigger compaction.
*/
int levelZeroFileNumCompactionTrigger();
/**
* Soft limit on number of level-0 files. We start slowing down writes at this
* point. A value < 0 means that no writing slow down will be triggered by
* number of files in level-0.
*
* @param numFiles soft limit on number of level-0 files.
* @return the reference to the current option.
*/
T setLevelZeroSlowdownWritesTrigger(
int numFiles);
/**
* Soft limit on the number of level-0 files. We start slowing down writes
* at this point. A value < 0 means that no writing slow down will be
* triggered by number of files in level-0.
*
* @return the soft limit on the number of level-0 files.
*/
int levelZeroSlowdownWritesTrigger();
/**
* Maximum number of level-0 files. We stop writes at this point.
*
* @param numFiles the hard limit of the number of level-0 files.
* @return the reference to the current option.
*/
T setLevelZeroStopWritesTrigger(int numFiles);
/**
* Maximum number of level-0 files. We stop writes at this point.
*
* @return the hard limit of the number of level-0 file.
*/
int levelZeroStopWritesTrigger();
/**
* The ratio between the total size of level-(L+1) files and the total
* size of level-L files for all L.
* DEFAULT: 10
*
* @param multiplier the ratio between the total size of level-(L+1)
* files and the total size of level-L files for all L.
* @return the reference to the current option.
*/
T setMaxBytesForLevelMultiplier(
double multiplier);
/**
* The ratio between the total size of level-(L+1) files and the total
* size of level-L files for all L.
* DEFAULT: 10
*
* @return the ratio between the total size of level-(L+1) files and
* the total size of level-L files for all L.
*/
double maxBytesForLevelMultiplier();
/**
* FIFO compaction option.
* The oldest table file will be deleted
* once the sum of table files reaches this size.
* The default value is 1GB (1 * 1024 * 1024 * 1024).
*
* @param maxTableFilesSize the size limit of the total sum of table files.
* @return the instance of the current object.
*/
T setMaxTableFilesSizeFIFO(
long maxTableFilesSize);
/**
* FIFO compaction option.
* The oldest table file will be deleted
* once the sum of table files reaches this size.
* The default value is 1GB (1 * 1024 * 1024 * 1024).
*
* @return the size limit of the total sum of table files.
*/
long maxTableFilesSizeFIFO();
/**
* Get the config for mem-table.
*
* @return the mem-table config.
*/
MemTableConfig memTableConfig();
/**
* Set the config for mem-table.
*
* @param memTableConfig the mem-table config.
* @return the instance of the current object.
* @throws java.lang.IllegalArgumentException thrown on 32-Bit platforms
* while overflowing the underlying platform specific value.
*/
T setMemTableConfig(MemTableConfig memTableConfig);
/**
* Returns the name of the current mem table representation.
* Memtable format can be set using setTableFormatConfig.
*
* @return the name of the currently-used memtable factory.
* @see #setTableFormatConfig(org.rocksdb.TableFormatConfig)
*/
String memTableFactoryName();
/**
* Get the config for table format.
*
* @return the table format config.
*/
TableFormatConfig tableFormatConfig();
/**
* Set the config for table format.
*
* @param config the table format config.
* @return the reference of the current options.
*/
T setTableFormatConfig(TableFormatConfig config);
/**
* @return the name of the currently used table factory.
*/
String tableFactoryName();
/**
* A list of paths where SST files for this column family
* can be put into, with its target size. Similar to db_paths,
* newer data is placed into paths specified earlier in the
* vector while older data gradually moves to paths specified
* later in the vector.
* Note that, if a path is supplied to multiple column
* families, it would have files and total size from all
* the column families combined. User should provision for the
* total size(from all the column families) in such cases.
*
* If left empty, db_paths will be used.
* Default: empty
*
* @param paths collection of paths for SST files.
* @return the reference of the current options.
*/
T setCfPaths(final Collection paths);
/**
* @return collection of paths for SST files.
*/
List cfPaths();
/**
* Compression algorithm that will be used for the bottommost level that
* contain files. If level-compaction is used, this option will only affect
* levels after base level.
*
* Default: {@link CompressionType#DISABLE_COMPRESSION_OPTION}
*
* @param bottommostCompressionType The compression type to use for the
* bottommost level
*
* @return the reference of the current options.
*/
T setBottommostCompressionType(
final CompressionType bottommostCompressionType);
/**
* Compression algorithm that will be used for the bottommost level that
* contain files. If level-compaction is used, this option will only affect
* levels after base level.
*
* Default: {@link CompressionType#DISABLE_COMPRESSION_OPTION}
*
* @return The compression type used for the bottommost level
*/
CompressionType bottommostCompressionType();
/**
* Set the options for compression algorithms used by
* {@link #bottommostCompressionType()} if it is enabled.
*
* To enable it, please see the definition of
* {@link CompressionOptions}.
*
* @param compressionOptions the bottom most compression options.
*
* @return the reference of the current options.
*/
T setBottommostCompressionOptions(
final CompressionOptions compressionOptions);
/**
* Get the bottom most compression options.
*
* See {@link #setBottommostCompressionOptions(CompressionOptions)}.
*
* @return the bottom most compression options.
*/
CompressionOptions bottommostCompressionOptions();
/**
* Set the different options for compression algorithms
*
* @param compressionOptions The compression options
*
* @return the reference of the current options.
*/
T setCompressionOptions(
CompressionOptions compressionOptions);
/**
* Get the different options for compression algorithms
*
* @return The compression options
*/
CompressionOptions compressionOptions();
/**
* If non-nullptr, use the specified factory for a function to determine the
* partitioning of sst files. This helps compaction to split the files
* on interesting boundaries (key prefixes) to make propagation of sst
* files less write amplifying (covering the whole key space).
*
* Default: nullptr
*
* @param factory The factory reference
* @return the reference of the current options.
*/
@Experimental("Caution: this option is experimental")
T setSstPartitionerFactory(SstPartitionerFactory factory);
/**
* Get SST partitioner factory
*
* @return SST partitioner factory
*/
@Experimental("Caution: this option is experimental")
SstPartitionerFactory sstPartitionerFactory();
/**
* Sets the maximum range delete calls, after which memtable is flushed.
* This applies to the mutable memtable.
*
* @param count a positive integer, 0 (default) to disable the feature.
* @return the reference of the current options.
*/
T setMemtableMaxRangeDeletions(final int count);
/**
* Gets the current setting of maximum range deletes allowed
* 0(default) indicates that feature is disabled.
*
* @return current value of memtable_max_range_deletions
*/
int memtableMaxRangeDeletions();
/**
* Compaction concurrent thread limiter for the column family.
* If non-nullptr, use given concurrent thread limiter to control
* the max outstanding compaction tasks. Limiter can be shared with
* multiple column families across db instances.
*
* @param concurrentTaskLimiter The compaction thread limiter.
* @return the reference of the current options.
*/
T setCompactionThreadLimiter(ConcurrentTaskLimiter concurrentTaskLimiter);
/**
* Get compaction thread limiter
*
* @return Compaction thread limiter
*/
ConcurrentTaskLimiter compactionThreadLimiter();
/**
* Default memtable memory budget used with the following methods:
*
*
* - {@link #optimizeLevelStyleCompaction()}
* - {@link #optimizeUniversalStyleCompaction()}
*
*/
long DEFAULT_COMPACTION_MEMTABLE_MEMORY_BUDGET = 512 * 1024 * 1024;
}