org.rocksdb

Interface AdvancedMutableColumnFamilyOptionsInterface<T extends AdvancedMutableColumnFamilyOptionsInterface>

All Known Subinterfaces:

MutableColumnFamilyOptionsInterface<T>

All Known Implementing Classes:

ColumnFamilyOptions, MutableColumnFamilyOptions.MutableColumnFamilyOptionsBuilder, Options

public interface AdvancedMutableColumnFamilyOptionsInterface<T extends AdvancedMutableColumnFamilyOptionsInterface>

Advanced Column Family Options which are mutable Taken from include/rocksdb/advanced_options.h and MutableCFOptions in util/cf_options.h

Method Summary

Methods

Modifier and Type	Method and Description
long	arenaBlockSize() The size of one block in arena memory allocation.
long	hardPendingCompactionBytesLimit() All writes are stopped if estimated bytes needed to be compaction exceed this threshold.
long	inplaceUpdateNumLocks() Number of locks used for inplace update Default: 10000, if inplace_update_support = true, else 0.
int	level0SlowdownWritesTrigger() Soft limit on number of level-0 files.
int	level0StopWritesTrigger() Maximum number of level-0 files.
double	maxBytesForLevelMultiplier() The ratio between the total size of level-(L+1) files and the total size of level-L files for all L.
int[]	maxBytesForLevelMultiplierAdditional() Different max-size multipliers for different levels.
long	maxSequentialSkipInIterations() An iteration->Next() sequentially skips over keys with the same user-key unless this option is set.
long	maxSuccessiveMerges() Maximum number of successive merge operations on a key in the memtable.
int	maxWriteBufferNumber() Returns maximum number of write buffers.
long	memtableHugePageSize() Page size for huge page TLB for bloom in memtable.
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.
boolean	paranoidFileChecks() After writing every SST file, reopen it and read all the keys.
boolean	reportBgIoStats() Determine whether IO stats in compactions and flushes are being measured
T	setArenaBlockSize(long arenaBlockSize) The size of one block in arena memory allocation.
T	setHardPendingCompactionBytesLimit(long hardPendingCompactionBytesLimit) All writes are stopped if estimated bytes needed to be compaction exceed this threshold.
T	setInplaceUpdateNumLocks(long inplaceUpdateNumLocks) Number of locks used for inplace update Default: 10000, if inplace_update_support = true, else 0.
T	setLevel0SlowdownWritesTrigger(int level0SlowdownWritesTrigger) Soft limit on number of level-0 files.
T	setLevel0StopWritesTrigger(int level0StopWritesTrigger) Maximum number of level-0 files.
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.
T	setMaxBytesForLevelMultiplierAdditional(int[] maxBytesForLevelMultiplierAdditional) Different max-size multipliers for different levels.
T	setMaxSequentialSkipInIterations(long maxSequentialSkipInIterations) An iteration->Next() sequentially skips over keys with the same user-key unless this option is set.
T	setMaxSuccessiveMerges(long maxSuccessiveMerges) Maximum number of successive merge operations on a key in the memtable.
T	setMaxWriteBufferNumber(int maxWriteBufferNumber) The maximum number of write buffers that are built up in memory.
T	setMemtableHugePageSize(long memtableHugePageSize) Page size for huge page TLB for bloom in memtable.
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.
T	setParanoidFileChecks(boolean paranoidFileChecks) After writing every SST file, reopen it and read all the keys.
T	setReportBgIoStats(boolean reportBgIoStats) Measure IO stats in compactions and flushes, if true.
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.
T	setTargetFileSizeBase(long targetFileSizeBase) The target file size for compaction.
T	setTargetFileSizeMultiplier(int multiplier) targetFileSizeMultiplier defines the size ratio between a level-L file and level-(L+1) file.
long	softPendingCompactionBytesLimit() All writes will be slowed down to at least delayed_write_rate if estimated bytes needed to be compaction exceed this threshold.
long	targetFileSizeBase() The target file size for compaction.
int	targetFileSizeMultiplier() targetFileSizeMultiplier defines the size ratio between a level-(L+1) file and level-L file.

Method Detail

setMaxWriteBufferNumber

T setMaxWriteBufferNumber(int maxWriteBufferNumber)

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

Parameters:

maxWriteBufferNumber - maximum number of write buffers.

Returns:

the instance of the current options.

maxWriteBufferNumber

int maxWriteBufferNumber()

Returns maximum number of write buffers.

Returns:

maximum number of write buffers.

See Also:

setMaxWriteBufferNumber(int)

setInplaceUpdateNumLocks

T setInplaceUpdateNumLocks(long inplaceUpdateNumLocks)

Number of locks used for inplace update Default: 10000, if inplace_update_support = true, else 0.

Parameters:

inplaceUpdateNumLocks - the number of locks used for inplace updates.

Returns:

the reference to the current options.

Throws:

java.lang.IllegalArgumentException - thrown on 32-Bit platforms while overflowing the underlying platform specific value.

inplaceUpdateNumLocks

long inplaceUpdateNumLocks()

Number of locks used for inplace update Default: 10000, if inplace_update_support = true, else 0.

Returns:

the number of locks used for inplace update.

setMemtablePrefixBloomSizeRatio

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)

Parameters:

memtablePrefixBloomSizeRatio - The ratio

Returns:

the reference to the current options.

memtablePrefixBloomSizeRatio

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)

Returns:

the ratio

setMemtableHugePageSize

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

Parameters:

memtableHugePageSize - The page size of the huge page tlb

Returns:

the reference to the current options.

memtableHugePageSize

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

Returns:

The page size of the huge page tlb

setArenaBlockSize

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

Parameters:

arenaBlockSize - the size of an arena block

Returns:

the reference to the current options.

Throws:

java.lang.IllegalArgumentException - thrown on 32-Bit platforms while overflowing the underlying platform specific value.

arenaBlockSize

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

Returns:

the size of an arena block

setLevel0SlowdownWritesTrigger

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.

Parameters:

level0SlowdownWritesTrigger - The soft limit on the number of level-0 files

Returns:

the reference to the current options.

level0SlowdownWritesTrigger

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.

Returns:

The soft limit on the number of level-0 files

setLevel0StopWritesTrigger

T setLevel0StopWritesTrigger(int level0StopWritesTrigger)

Maximum number of level-0 files. We stop writes at this point.

Parameters:

level0StopWritesTrigger - The maximum number of level-0 files

Returns:

the reference to the current options.

level0StopWritesTrigger

int level0StopWritesTrigger()

Maximum number of level-0 files. We stop writes at this point.

Returns:

The maximum number of level-0 files

setTargetFileSizeBase

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.

Parameters:

targetFileSizeBase - the target size of a level-0 file.

Returns:

the reference to the current options.

See Also:

setTargetFileSizeMultiplier(int)

targetFileSizeBase

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.

Returns:

the target size of a level-0 file.

See Also:

targetFileSizeMultiplier()

setTargetFileSizeMultiplier

T setTargetFileSizeMultiplier(int multiplier)

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.

Parameters:

multiplier - the size ratio between a level-(L+1) file and level-L file.

Returns:

the reference to the current options.

targetFileSizeMultiplier

int targetFileSizeMultiplier()

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.

Returns:

the size ratio between a level-(L+1) file and level-L file.

setMaxBytesForLevelMultiplier

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

Parameters:

multiplier - the ratio between the total size of level-(L+1) files and the total size of level-L files for all L.

Returns:

the reference to the current options. See MutableColumnFamilyOptionsInterface.setMaxBytesForLevelBase(long)

maxBytesForLevelMultiplier

double maxBytesForLevelMultiplier()

The ratio between the total size of level-(L+1) files and the total size of level-L files for all L. DEFAULT: 10

Returns:

the ratio between the total size of level-(L+1) files and the total size of level-L files for all L. See MutableColumnFamilyOptionsInterface.maxBytesForLevelBase()

setMaxBytesForLevelMultiplierAdditional

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

Parameters:

maxBytesForLevelMultiplierAdditional - The max-size multipliers for each level

Returns:

the reference to the current options.

maxBytesForLevelMultiplierAdditional

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

Returns:

The max-size multipliers for each level

setSoftPendingCompactionBytesLimit

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

Parameters:

softPendingCompactionBytesLimit - The soft limit to impose on compaction

Returns:

the reference to the current options.

softPendingCompactionBytesLimit

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

Returns:

The soft limit to impose on compaction

setHardPendingCompactionBytesLimit

T setHardPendingCompactionBytesLimit(long hardPendingCompactionBytesLimit)

All writes are stopped if estimated bytes needed to be compaction exceed this threshold. Default: 256GB

Parameters:

hardPendingCompactionBytesLimit - The hard limit to impose on compaction

Returns:

the reference to the current options.

hardPendingCompactionBytesLimit

long hardPendingCompactionBytesLimit()

All writes are stopped if estimated bytes needed to be compaction exceed this threshold. Default: 256GB

Returns:

The hard limit to impose on compaction

setMaxSequentialSkipInIterations

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

Parameters:

maxSequentialSkipInIterations - the number of keys could be skipped in a iteration.

Returns:

the reference to the current options.

maxSequentialSkipInIterations

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

Returns:

the number of keys could be skipped in a iteration.

setMaxSuccessiveMerges

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)

Parameters:

maxSuccessiveMerges - the maximum number of successive merges.

Returns:

the reference to the current options.

Throws:

java.lang.IllegalArgumentException - thrown on 32-Bit platforms while overflowing the underlying platform specific value.

maxSuccessiveMerges

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)

Returns:

the maximum number of successive merges.

setParanoidFileChecks

T setParanoidFileChecks(boolean paranoidFileChecks)

After writing every SST file, reopen it and read all the keys. Default: false

Parameters:

paranoidFileChecks - true to enable paranoid file checks

Returns:

the reference to the current options.

paranoidFileChecks

boolean paranoidFileChecks()

After writing every SST file, reopen it and read all the keys. Default: false

Returns:

true if paranoid file checks are enabled

setReportBgIoStats

T setReportBgIoStats(boolean reportBgIoStats)

Measure IO stats in compactions and flushes, if true. Default: false

Parameters:

reportBgIoStats - true to enable reporting

Returns:

the reference to the current options.

reportBgIoStats

boolean reportBgIoStats()

Determine whether IO stats in compactions and flushes are being measured

Returns:

true if reporting is enabled