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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;
/**
* Advanced Column Family Options which are mutable
*
* Taken from include/rocksdb/advanced_options.h
* and MutableCFOptions in util/cf_options.h
*/
public interface AdvancedMutableColumnFamilyOptionsInterface
{
/**
* The maximum number of write buffers that are built up in memory.
* The default is 2, so that when 1 write buffer is being flushed to
* storage, new writes can continue to the other write buffer.
* Default: 2
*
* @param maxWriteBufferNumber maximum number of write buffers.
* @return the instance of the current options.
*/
T setMaxWriteBufferNumber(
int maxWriteBufferNumber);
/**
* Returns maximum number of write buffers.
*
* @return maximum number of write buffers.
* @see #setMaxWriteBufferNumber(int)
*/
int maxWriteBufferNumber();
/**
* Number of locks used for inplace update
* Default: 10000, if inplace_update_support = true, else 0.
*
* @param inplaceUpdateNumLocks the number of locks used for
* inplace updates.
* @return the reference to the current options.
* @throws java.lang.IllegalArgumentException thrown on 32-Bit platforms
* while overflowing the underlying platform specific value.
*/
T setInplaceUpdateNumLocks(
long inplaceUpdateNumLocks);
/**
* Number of locks used for inplace update
* Default: 10000, if inplace_update_support = true, else 0.
*
* @return the number of locks used for inplace update.
*/
long inplaceUpdateNumLocks();
/**
* if prefix_extractor is set and memtable_prefix_bloom_size_ratio is not 0,
* create prefix bloom for memtable with the size of
* write_buffer_size * memtable_prefix_bloom_size_ratio.
* If it is larger than 0.25, it is santinized to 0.25.
*
* Default: 0 (disable)
*
* @param memtablePrefixBloomSizeRatio The ratio
* @return the reference to the current options.
*/
T setMemtablePrefixBloomSizeRatio(
double memtablePrefixBloomSizeRatio);
/**
* if prefix_extractor is set and memtable_prefix_bloom_size_ratio is not 0,
* create prefix bloom for memtable with the size of
* write_buffer_size * memtable_prefix_bloom_size_ratio.
* If it is larger than 0.25, it is santinized to 0.25.
*
* Default: 0 (disable)
*
* @return the ratio
*/
double memtablePrefixBloomSizeRatio();
/**
* Page size for huge page TLB for bloom in memtable. If ≤ 0, not allocate
* from huge page TLB but from malloc.
* Need to reserve huge pages for it to be allocated. For example:
* sysctl -w vm.nr_hugepages=20
* See linux doc Documentation/vm/hugetlbpage.txt
*
* @param memtableHugePageSize The page size of the huge
* page tlb
* @return the reference to the current options.
*/
T setMemtableHugePageSize(
long memtableHugePageSize);
/**
* Page size for huge page TLB for bloom in memtable. If ≤ 0, not allocate
* from huge page TLB but from malloc.
* Need to reserve huge pages for it to be allocated. For example:
* sysctl -w vm.nr_hugepages=20
* See linux doc Documentation/vm/hugetlbpage.txt
*
* @return The page size of the huge page tlb
*/
long memtableHugePageSize();
/**
* The size of one block in arena memory allocation.
* If ≤ 0, a proper value is automatically calculated (usually 1/10 of
* writer_buffer_size).
*
* There are two additional restriction of the specified size:
* (1) size should be in the range of [4096, 2 << 30] and
* (2) be the multiple of the CPU word (which helps with the memory
* alignment).
*
* We'll automatically check and adjust the size number to make sure it
* conforms to the restrictions.
* Default: 0
*
* @param arenaBlockSize the size of an arena block
* @return the reference to the current options.
* @throws java.lang.IllegalArgumentException thrown on 32-Bit platforms
* while overflowing the underlying platform specific value.
*/
T setArenaBlockSize(long arenaBlockSize);
/**
* The size of one block in arena memory allocation.
* If ≤ 0, a proper value is automatically calculated (usually 1/10 of
* writer_buffer_size).
*
* There are two additional restriction of the specified size:
* (1) size should be in the range of [4096, 2 << 30] and
* (2) be the multiple of the CPU word (which helps with the memory
* alignment).
*
* We'll automatically check and adjust the size number to make sure it
* conforms to the restrictions.
* Default: 0
*
* @return the size of an arena block
*/
long arenaBlockSize();
/**
* 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 level0SlowdownWritesTrigger The soft limit on the number of
* level-0 files
* @return the reference to the current options.
*/
T setLevel0SlowdownWritesTrigger(
int level0SlowdownWritesTrigger);
/**
* 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.
*
* @return The soft limit on the number of
* level-0 files
*/
int level0SlowdownWritesTrigger();
/**
* Maximum number of level-0 files. We stop writes at this point.
*
* @param level0StopWritesTrigger The maximum number of level-0 files
* @return the reference to the current options.
*/
T setLevel0StopWritesTrigger(
int level0StopWritesTrigger);
/**
* Maximum number of level-0 files. We stop writes at this point.
*
* @return The maximum number of level-0 files
*/
int level0StopWritesTrigger();
/**
* The target file size for compaction.
* This targetFileSizeBase determines a level-1 file size.
* Target file size for level L can be calculated by
* targetFileSizeBase * (targetFileSizeMultiplier ^ (L-1))
* For example, if targetFileSizeBase is 2MB and
* target_file_size_multiplier is 10, then each file on level-1 will
* be 2MB, and each file on level 2 will be 20MB,
* and each file on level-3 will be 200MB.
* by default targetFileSizeBase is 2MB.
*
* @param targetFileSizeBase the target size of a level-0 file.
* @return the reference to the current options.
*
* @see #setTargetFileSizeMultiplier(int)
*/
T setTargetFileSizeBase(
long targetFileSizeBase);
/**
* The target file size for compaction.
* This targetFileSizeBase determines a level-1 file size.
* Target file size for level L can be calculated by
* targetFileSizeBase * (targetFileSizeMultiplier ^ (L-1))
* For example, if targetFileSizeBase is 2MB and
* target_file_size_multiplier is 10, then each file on level-1 will
* be 2MB, and each file on level 2 will be 20MB,
* and each file on level-3 will be 200MB.
* by default targetFileSizeBase is 2MB.
*
* @return the target size of a level-0 file.
*
* @see #targetFileSizeMultiplier()
*/
long targetFileSizeBase();
/**
* targetFileSizeMultiplier defines the size ratio between a
* level-L file and level-(L+1) file.
* By default target_file_size_multiplier is 1, meaning
* files in different levels have the same target.
*
* @param multiplier the size ratio between a level-(L+1) file
* and level-L file.
* @return the reference to the current options.
*/
T setTargetFileSizeMultiplier(
int multiplier);
/**
* targetFileSizeMultiplier defines the size ratio between a
* level-(L+1) file and level-L file.
* By default targetFileSizeMultiplier is 1, meaning
* files in different levels have the same target.
*
* @return the size ratio between a level-(L+1) file and level-L file.
*/
int targetFileSizeMultiplier();
/**
* 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 options.
*
* See {@link MutableColumnFamilyOptionsInterface#setMaxBytesForLevelBase(long)}
*/
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.
*
* See {@link MutableColumnFamilyOptionsInterface#maxBytesForLevelBase()}
*/
double maxBytesForLevelMultiplier();
/**
* Different max-size multipliers for different levels.
* These are multiplied by max_bytes_for_level_multiplier to arrive
* at the max-size of each level.
*
* Default: 1
*
* @param maxBytesForLevelMultiplierAdditional The max-size multipliers
* for each level
* @return the reference to the current options.
*/
T setMaxBytesForLevelMultiplierAdditional(
int[] maxBytesForLevelMultiplierAdditional);
/**
* Different max-size multipliers for different levels.
* These are multiplied by max_bytes_for_level_multiplier to arrive
* at the max-size of each level.
*
* Default: 1
*
* @return The max-size multipliers for each level
*/
int[] maxBytesForLevelMultiplierAdditional();
/**
* All writes will be slowed down to at least delayed_write_rate if estimated
* bytes needed to be compaction exceed this threshold.
*
* Default: 64GB
*
* @param softPendingCompactionBytesLimit The soft limit to impose on
* compaction
* @return the reference to the current options.
*/
T setSoftPendingCompactionBytesLimit(
long softPendingCompactionBytesLimit);
/**
* All writes will be slowed down to at least delayed_write_rate if estimated
* bytes needed to be compaction exceed this threshold.
*
* Default: 64GB
*
* @return The soft limit to impose on compaction
*/
long softPendingCompactionBytesLimit();
/**
* All writes are stopped if estimated bytes needed to be compaction exceed
* this threshold.
*
* Default: 256GB
*
* @param hardPendingCompactionBytesLimit The hard limit to impose on
* compaction
* @return the reference to the current options.
*/
T setHardPendingCompactionBytesLimit(
long hardPendingCompactionBytesLimit);
/**
* All writes are stopped if estimated bytes needed to be compaction exceed
* this threshold.
*
* Default: 256GB
*
* @return The hard limit to impose on compaction
*/
long hardPendingCompactionBytesLimit();
/**
* An iteration->Next() sequentially skips over keys with the same
* user-key unless this option is set. This number specifies the number
* of keys (with the same userkey) that will be sequentially
* skipped before a reseek is issued.
* Default: 8
*
* @param maxSequentialSkipInIterations the number of keys could
* be skipped in a iteration.
* @return the reference to the current options.
*/
T setMaxSequentialSkipInIterations(
long maxSequentialSkipInIterations);
/**
* An iteration->Next() sequentially skips over keys with the same
* user-key unless this option is set. This number specifies the number
* of keys (with the same userkey) that will be sequentially
* skipped before a reseek is issued.
* Default: 8
*
* @return the number of keys could be skipped in a iteration.
*/
long maxSequentialSkipInIterations();
/**
* Maximum number of successive merge operations on a key in the memtable.
*
* When a merge operation is added to the memtable and the maximum number of
* successive merges is reached, the value of the key will be calculated and
* inserted into the memtable instead of the merge operation. This will
* ensure that there are never more than max_successive_merges merge
* operations in the memtable.
*
* Default: 0 (disabled)
*
* @param maxSuccessiveMerges the maximum number of successive merges.
* @return the reference to the current options.
* @throws java.lang.IllegalArgumentException thrown on 32-Bit platforms
* while overflowing the underlying platform specific value.
*/
T setMaxSuccessiveMerges(
long maxSuccessiveMerges);
/**
* Maximum number of successive merge operations on a key in the memtable.
*
* When a merge operation is added to the memtable and the maximum number of
* successive merges is reached, the value of the key will be calculated and
* inserted into the memtable instead of the merge operation. This will
* ensure that there are never more than max_successive_merges merge
* operations in the memtable.
*
* Default: 0 (disabled)
*
* @return the maximum number of successive merges.
*/
long maxSuccessiveMerges();
/**
* After writing every SST file, reopen it and read all the keys.
*
* Default: false
*
* @param paranoidFileChecks true to enable paranoid file checks
* @return the reference to the current options.
*/
T setParanoidFileChecks(
boolean paranoidFileChecks);
/**
* After writing every SST file, reopen it and read all the keys.
*
* Default: false
*
* @return true if paranoid file checks are enabled
*/
boolean paranoidFileChecks();
/**
* Measure IO stats in compactions and flushes, if true.
*
* Default: false
*
* @param reportBgIoStats true to enable reporting
* @return the reference to the current options.
*/
T setReportBgIoStats(
boolean reportBgIoStats);
/**
* Determine whether IO stats in compactions and flushes are being measured
*
* @return true if reporting is enabled
*/
boolean reportBgIoStats();
}
