org.apache.cassandra.metrics

Class ColumnFamilyMetrics

java.lang.Object

org.apache.cassandra.metrics.ColumnFamilyMetrics

public class ColumnFamilyMetrics
extends java.lang.Object

Metrics for ColumnFamilyStore.

Field Summary

Fields

Modifier and Type	Field and Description
com.yammer.metrics.core.Gauge<java.lang.Long>	bloomFilterDiskSpaceUsed Disk space used by bloom filter
com.yammer.metrics.core.Gauge<java.lang.Long>	bloomFilterFalsePositives Number of false positives in bloom filter
com.yammer.metrics.core.Gauge<java.lang.Double>	bloomFilterFalseRatio False positive ratio of bloom filter
com.yammer.metrics.core.Gauge<java.lang.Double>	compressionRatio Current compression ratio for all SSTables
com.yammer.metrics.core.Gauge<long[]>	estimatedColumnCountHistogram Histogram of estimated number of columns.
com.yammer.metrics.core.Gauge<long[]>	estimatedRowSizeHistogram Histogram of estimated row size (in bytes).
com.yammer.metrics.core.Gauge<java.lang.Double>	keyCacheHitRate Key cache hit rate for this CF
com.yammer.metrics.core.Counter	liveDiskSpaceUsed Disk space used by SSTables belonging to this CF
com.yammer.metrics.core.Gauge<java.lang.Integer>	liveSSTableCount Number of SSTables on disk for this CF
com.yammer.metrics.core.Gauge<java.lang.Long>	maxRowSize Size of the largest compacted row
com.yammer.metrics.core.Gauge<java.lang.Long>	meanRowSize Size of the smallest compacted row
com.yammer.metrics.core.Gauge<java.lang.Long>	memtableColumnsCount Total number of columns present in the memtable.
com.yammer.metrics.core.Gauge<java.lang.Long>	memtableDataSize Total amount of data stored in the memtable, including column related overhead.
com.yammer.metrics.core.Counter	memtableSwitchCount Number of times flush has resulted in the memtable being switched out.
com.yammer.metrics.core.Gauge<java.lang.Long>	minRowSize Size of the smallest compacted row
com.yammer.metrics.core.Gauge<java.lang.Integer>	pendingTasks Estimated number of tasks pending for this column family
LatencyMetrics	readLatency Read metrics
com.yammer.metrics.core.Gauge<java.lang.Long>	recentBloomFilterFalsePositives Number of false positives in bloom filter from last read
com.yammer.metrics.core.Gauge<java.lang.Double>	recentBloomFilterFalseRatio False positive ratio of bloom filter from last read
EstimatedHistogram	recentSSTablesPerRead Deprecated.
com.yammer.metrics.core.Counter	speculativeRetry
EstimatedHistogram	sstablesPerRead Deprecated.
com.yammer.metrics.core.Histogram	sstablesPerReadHistogram Histogram of the number of sstable data files accessed per read
com.yammer.metrics.core.Counter	totalDiskSpaceUsed Total disk space used by SSTables belonging to this CF, including obsolete ones waiting to be GC'd
LatencyMetrics	writeLatency Write metrics

Constructor Summary

Constructors

Constructor and Description
ColumnFamilyMetrics(ColumnFamilyStore cfs) Creates metrics for given ColumnFamilyStore.

Method Summary

Methods

Modifier and Type	Method and Description
void	release() Release all associated metrics.
void	updateSSTableIterated(int count)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

memtableDataSize

public final com.yammer.metrics.core.Gauge<java.lang.Long> memtableDataSize

Total amount of data stored in the memtable, including column related overhead.

memtableColumnsCount

public final com.yammer.metrics.core.Gauge<java.lang.Long> memtableColumnsCount

Total number of columns present in the memtable.

memtableSwitchCount

public final com.yammer.metrics.core.Counter memtableSwitchCount

Number of times flush has resulted in the memtable being switched out.

compressionRatio

public final com.yammer.metrics.core.Gauge<java.lang.Double> compressionRatio

Current compression ratio for all SSTables

estimatedRowSizeHistogram

public final com.yammer.metrics.core.Gauge<long[]> estimatedRowSizeHistogram

Histogram of estimated row size (in bytes).

estimatedColumnCountHistogram

public final com.yammer.metrics.core.Gauge<long[]> estimatedColumnCountHistogram

Histogram of estimated number of columns.

sstablesPerReadHistogram

public final com.yammer.metrics.core.Histogram sstablesPerReadHistogram

Histogram of the number of sstable data files accessed per read

readLatency

public final LatencyMetrics readLatency

Read metrics

writeLatency

public final LatencyMetrics writeLatency

Write metrics

pendingTasks

public final com.yammer.metrics.core.Gauge<java.lang.Integer> pendingTasks

Estimated number of tasks pending for this column family

liveSSTableCount

public final com.yammer.metrics.core.Gauge<java.lang.Integer> liveSSTableCount

Number of SSTables on disk for this CF

liveDiskSpaceUsed

public final com.yammer.metrics.core.Counter liveDiskSpaceUsed

Disk space used by SSTables belonging to this CF

totalDiskSpaceUsed

public final com.yammer.metrics.core.Counter totalDiskSpaceUsed

Total disk space used by SSTables belonging to this CF, including obsolete ones waiting to be GC'd

minRowSize

public final com.yammer.metrics.core.Gauge<java.lang.Long> minRowSize

Size of the smallest compacted row

maxRowSize

public final com.yammer.metrics.core.Gauge<java.lang.Long> maxRowSize

Size of the largest compacted row

meanRowSize

public final com.yammer.metrics.core.Gauge<java.lang.Long> meanRowSize

Size of the smallest compacted row

bloomFilterFalsePositives

public final com.yammer.metrics.core.Gauge<java.lang.Long> bloomFilterFalsePositives

Number of false positives in bloom filter

recentBloomFilterFalsePositives

public final com.yammer.metrics.core.Gauge<java.lang.Long> recentBloomFilterFalsePositives

Number of false positives in bloom filter from last read

bloomFilterFalseRatio

public final com.yammer.metrics.core.Gauge<java.lang.Double> bloomFilterFalseRatio

False positive ratio of bloom filter

recentBloomFilterFalseRatio

public final com.yammer.metrics.core.Gauge<java.lang.Double> recentBloomFilterFalseRatio

False positive ratio of bloom filter from last read

bloomFilterDiskSpaceUsed

public final com.yammer.metrics.core.Gauge<java.lang.Long> bloomFilterDiskSpaceUsed

Disk space used by bloom filter

keyCacheHitRate

public final com.yammer.metrics.core.Gauge<java.lang.Double> keyCacheHitRate

Key cache hit rate for this CF

speculativeRetry

public final com.yammer.metrics.core.Counter speculativeRetry

sstablesPerRead

@Deprecated
public final EstimatedHistogram sstablesPerRead

Deprecated.

recentSSTablesPerRead

@Deprecated
public final EstimatedHistogram recentSSTablesPerRead

Deprecated.

Constructor Detail

ColumnFamilyMetrics

public ColumnFamilyMetrics(ColumnFamilyStore cfs)

Creates metrics for given ColumnFamilyStore.

Parameters:

cfs - ColumnFamilyStore to measure metrics

Method Detail

updateSSTableIterated

public void updateSSTableIterated(int count)

release

public void release()

Release all associated metrics.