org.apache.cassandra.metrics

Class KeyspaceMetrics

java.lang.Object

org.apache.cassandra.metrics.KeyspaceMetrics

public class KeyspaceMetrics
extends java.lang.Object

Metrics for ColumnFamilyStore.

Field Summary

Fields

Modifier and Type	Field and Description
com.yammer.metrics.core.Gauge<java.lang.Long>	allMemtablesDataSize Total amount of data stored in the memtables (2i and pending flush memtables included).
com.yammer.metrics.core.Gauge<java.lang.Long>	bloomFilterDiskSpaceUsed Disk space used by bloom filter
com.yammer.metrics.core.Gauge<java.lang.Long>	liveDiskSpaceUsed Disk space used by SSTables belonging to this CF
com.yammer.metrics.core.Histogram	liveScannedHistogram Live cells scanned in queries on this Keyspace
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.Gauge<java.lang.Long>	memtableSwitchCount Number of times flush has resulted in the memtable being switched out.
com.yammer.metrics.core.Gauge<java.lang.Long>	pendingCompactions Estimate of number of pending compactios for this CF
com.yammer.metrics.core.Gauge<java.lang.Integer>	pendingTasks Estimated number of tasks pending for this column family
LatencyMetrics	rangeLatency (Local) range slice metrics
LatencyMetrics	readLatency (Local) read metrics
com.yammer.metrics.core.Histogram	sstablesPerReadHistogram Histogram of the number of sstable data files accessed per read
com.yammer.metrics.core.Histogram	tombstoneScannedHistogram Tombstones scanned in queries on this Keyspace
com.yammer.metrics.core.Gauge<java.lang.Long>	totalDiskSpaceUsed Total disk space used by SSTables belonging to this CF, including obsolete ones waiting to be GC'd
LatencyMetrics	writeLatency (Local) write metrics

Constructor Summary

Constructors

Constructor and Description
KeyspaceMetrics(Keyspace ks) Creates metrics for given ColumnFamilyStore.

Method Summary

Methods

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

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.

allMemtablesDataSize

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

Total amount of data stored in the memtables (2i and pending flush memtables included).

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.Gauge<java.lang.Long> memtableSwitchCount

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

pendingTasks

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

Estimated number of tasks pending for this column family

pendingCompactions

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

Estimate of number of pending compactios for this CF

liveDiskSpaceUsed

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

Disk space used by SSTables belonging to this CF

totalDiskSpaceUsed

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

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

bloomFilterDiskSpaceUsed

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

Disk space used by bloom filter

readLatency

public final LatencyMetrics readLatency

(Local) read metrics

rangeLatency

public final LatencyMetrics rangeLatency

(Local) range slice metrics

writeLatency

public final LatencyMetrics writeLatency

(Local) write metrics

sstablesPerReadHistogram

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

Histogram of the number of sstable data files accessed per read

tombstoneScannedHistogram

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

Tombstones scanned in queries on this Keyspace

liveScannedHistogram

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

Live cells scanned in queries on this Keyspace

Constructor Detail

KeyspaceMetrics

public KeyspaceMetrics(Keyspace ks)

Creates metrics for given ColumnFamilyStore.

Parameters:

ks - Keyspace to measure metrics

Method Detail

release

public void release()

Release all associated metrics.