/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.cassandra.metrics;
import java.nio.ByteBuffer;
import java.util.*;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.TimeUnit;
import org.apache.cassandra.db.ColumnFamilyStore;
import org.apache.cassandra.db.Keyspace;
import org.apache.cassandra.io.sstable.SSTableReader;
import org.apache.cassandra.io.sstable.metadata.MetadataCollector;
import org.apache.cassandra.utils.EstimatedHistogram;
import org.apache.cassandra.utils.TopKSampler;
import com.google.common.collect.Maps;
import com.google.common.collect.Sets;
import com.yammer.metrics.Metrics;
import com.yammer.metrics.core.*;
import com.yammer.metrics.core.Timer;
import com.yammer.metrics.util.RatioGauge;
/**
* Metrics for {@link ColumnFamilyStore}.
*/
public class ColumnFamilyMetrics
{
/** Total amount of data stored in the memtable that resides on-heap, including column related overhead and overwritten rows. */
public final Gauge<Long> memtableOnHeapSize;
/** Total amount of data stored in the memtable that resides off-heap, including column related overhead and overwritten rows. */
public final Gauge<Long> memtableOffHeapSize;
/** Total amount of live data stored in the memtable, excluding any data structure overhead */
public final Gauge<Long> memtableLiveDataSize;
/** Total amount of data stored in the memtables (2i and pending flush memtables included) that resides on-heap. */
public final Gauge<Long> allMemtablesOnHeapSize;
/** Total amount of data stored in the memtables (2i and pending flush memtables included) that resides off-heap. */
public final Gauge<Long> allMemtablesOffHeapSize;
/** Total amount of live data stored in the memtables (2i and pending flush memtables included) that resides off-heap, excluding any data structure overhead */
public final Gauge<Long> allMemtablesLiveDataSize;
/** Total number of columns present in the memtable. */
public final Gauge<Long> memtableColumnsCount;
/** Number of times flush has resulted in the memtable being switched out. */
public final Counter memtableSwitchCount;
/** Current compression ratio for all SSTables */
public final Gauge<Double> compressionRatio;
/** Histogram of estimated row size (in bytes). */
public final Gauge<long[]> estimatedRowSizeHistogram;
/** Histogram of estimated number of columns. */
public final Gauge<long[]> estimatedColumnCountHistogram;
/** Histogram of the number of sstable data files accessed per read */
public final ColumnFamilyHistogram sstablesPerReadHistogram;
/** (Local) read metrics */
public final LatencyMetrics readLatency;
/** (Local) range slice metrics */
public final LatencyMetrics rangeLatency;
/** (Local) write metrics */
public final LatencyMetrics writeLatency;
/** Estimated number of tasks pending for this column family */
public final Counter pendingFlushes;
/** Estimate of number of pending compactios for this CF */
public final Gauge<Integer> pendingCompactions;
/** Number of SSTables on disk for this CF */
public final Gauge<Integer> liveSSTableCount;
/** Disk space used by SSTables belonging to this CF */
public final Counter liveDiskSpaceUsed;
/** Total disk space used by SSTables belonging to this CF, including obsolete ones waiting to be GC'd */
public final Counter totalDiskSpaceUsed;
/** Size of the smallest compacted row */
public final Gauge<Long> minRowSize;
/** Size of the largest compacted row */
public final Gauge<Long> maxRowSize;
/** Size of the smallest compacted row */
public final Gauge<Long> meanRowSize;
/** Number of false positives in bloom filter */
public final Gauge<Long> bloomFilterFalsePositives;
/** Number of false positives in bloom filter from last read */
public final Gauge<Long> recentBloomFilterFalsePositives;
/** False positive ratio of bloom filter */
public final Gauge<Double> bloomFilterFalseRatio;
/** False positive ratio of bloom filter from last read */
public final Gauge<Double> recentBloomFilterFalseRatio;
/** Disk space used by bloom filter */
public final Gauge<Long> bloomFilterDiskSpaceUsed;
/** Off heap memory used by bloom filter */
public final Gauge<Long> bloomFilterOffHeapMemoryUsed;
/** Off heap memory used by index summary */
public final Gauge<Long> indexSummaryOffHeapMemoryUsed;
/** Off heap memory used by compression meta data*/
public final Gauge<Long> compressionMetadataOffHeapMemoryUsed;
/** Key cache hit rate for this CF */
public final Gauge<Double> keyCacheHitRate;
/** Tombstones scanned in queries on this CF */
public final ColumnFamilyHistogram tombstoneScannedHistogram;
/** Live cells scanned in queries on this CF */
public final ColumnFamilyHistogram liveScannedHistogram;
/** Column update time delta on this CF */
public final ColumnFamilyHistogram colUpdateTimeDeltaHistogram;
/** Disk space used by snapshot files which */
public final Gauge<Long> trueSnapshotsSize;
/** Row cache hits, but result out of range */
public final Counter rowCacheHitOutOfRange;
/** Number of row cache hits */
public final Counter rowCacheHit;
/** Number of row cache misses */
public final Counter rowCacheMiss;
/** CAS Prepare metrics */
public final LatencyMetrics casPrepare;
/** CAS Propose metrics */
public final LatencyMetrics casPropose;
/** CAS Commit metrics */
public final LatencyMetrics casCommit;
public final Timer coordinatorReadLatency;
public final Timer coordinatorScanLatency;
/** Time spent waiting for free memtable space, either on- or off-heap */
public final Timer waitingOnFreeMemtableSpace;
private final MetricNameFactory factory;
private static final MetricNameFactory globalNameFactory = new AllColumnFamilyMetricNameFactory();;
public final Counter speculativeRetries;
// for backward compatibility
@Deprecated public final EstimatedHistogram sstablesPerRead = new EstimatedHistogram(35);
@Deprecated public final EstimatedHistogram recentSSTablesPerRead = new EstimatedHistogram(35);
public final static LatencyMetrics globalReadLatency = new LatencyMetrics(globalNameFactory, "Read");
public final static LatencyMetrics globalWriteLatency = new LatencyMetrics(globalNameFactory, "Write");
public final static LatencyMetrics globalRangeLatency = new LatencyMetrics(globalNameFactory, "Range");
public final Map<Sampler, TopKSampler<ByteBuffer>> samplers;
/**
* stores metrics that will be rolled into a single global metric
*/
public final static ConcurrentMap<String, Set<Metric>> allColumnFamilyMetrics = Maps.newConcurrentMap();
/**
* Stores all metric names created that can be used when unregistering
*/
public final static Set<String> all = Sets.newHashSet();
private interface GetHistogram
{
public EstimatedHistogram getHistogram(SSTableReader reader);
}
private static long[] combineHistograms(Iterable<SSTableReader> sstables, GetHistogram getHistogram)
{
Iterator<SSTableReader> iterator = sstables.iterator();
if (!iterator.hasNext())
{
return new long[0];
}
long[] firstBucket = getHistogram.getHistogram(iterator.next()).getBuckets(false);
long[] values = new long[firstBucket.length];
System.arraycopy(firstBucket, 0, values, 0, values.length);
while (iterator.hasNext())
{
long[] nextBucket = getHistogram.getHistogram(iterator.next()).getBuckets(false);
if (nextBucket.length > values.length)
{
long[] newValues = new long[nextBucket.length];
System.arraycopy(firstBucket, 0, newValues, 0, firstBucket.length);
for (int i = 0; i < newValues.length; i++)
{
newValues[i] += nextBucket[i];
}
values = newValues;
}
else
{
for (int i = 0; i < values.length; i++)
{
values[i] += nextBucket[i];
}
}
}
return values;
}
/**
* Creates metrics for given {@link ColumnFamilyStore}.
*
* @param cfs ColumnFamilyStore to measure metrics
*/
public ColumnFamilyMetrics(final ColumnFamilyStore cfs)
{
factory = new ColumnFamilyMetricNameFactory(cfs);
samplers = Maps.newHashMap();
for (Sampler sampler : Sampler.values())
{
samplers.put(sampler, new TopKSampler<ByteBuffer>());
}
memtableColumnsCount = createColumnFamilyGauge("MemtableColumnsCount", new Gauge<Long>()
{
public Long value()
{
return cfs.getDataTracker().getView().getCurrentMemtable().getOperations();
}
});
memtableOnHeapSize = createColumnFamilyGauge("MemtableOnHeapSize", new Gauge<Long>()
{
public Long value()
{
return cfs.getDataTracker().getView().getCurrentMemtable().getAllocator().onHeap().owns();
}
});
memtableOffHeapSize = createColumnFamilyGauge("MemtableOffHeapSize", new Gauge<Long>()
{
public Long value()
{
return cfs.getDataTracker().getView().getCurrentMemtable().getAllocator().offHeap().owns();
}
});
memtableLiveDataSize = createColumnFamilyGauge("MemtableLiveDataSize", new Gauge<Long>()
{
public Long value()
{
return cfs.getDataTracker().getView().getCurrentMemtable().getLiveDataSize();
}
});
allMemtablesOnHeapSize = createColumnFamilyGauge("AllMemtablesHeapSize", new Gauge<Long>()
{
public Long value()
{
long size = 0;
for (ColumnFamilyStore cfs2 : cfs.concatWithIndexes())
size += cfs2.getDataTracker().getView().getCurrentMemtable().getAllocator().onHeap().owns();
return size;
}
});
allMemtablesOffHeapSize = createColumnFamilyGauge("AllMemtablesOffHeapSize", new Gauge<Long>()
{
public Long value()
{
long size = 0;
for (ColumnFamilyStore cfs2 : cfs.concatWithIndexes())
size += cfs2.getDataTracker().getView().getCurrentMemtable().getAllocator().offHeap().owns();
return size;
}
});
allMemtablesLiveDataSize = createColumnFamilyGauge("AllMemtablesLiveDataSize", new Gauge<Long>()
{
public Long value()
{
long size = 0;
for (ColumnFamilyStore cfs2 : cfs.concatWithIndexes())
size += cfs2.getDataTracker().getView().getCurrentMemtable().getLiveDataSize();
return size;
}
});
memtableSwitchCount = createColumnFamilyCounter("MemtableSwitchCount");
estimatedRowSizeHistogram = Metrics.newGauge(factory.createMetricName("EstimatedRowSizeHistogram"), new Gauge<long[]>()
{
public long[] value()
{
return combineHistograms(cfs.getSSTables(), new GetHistogram()
{
public EstimatedHistogram getHistogram(SSTableReader reader)
{
return reader.getEstimatedRowSize();
}
});
}
});
estimatedColumnCountHistogram = Metrics.newGauge(factory.createMetricName("EstimatedColumnCountHistogram"), new Gauge<long[]>()
{
public long[] value()
{
return combineHistograms(cfs.getSSTables(), new GetHistogram()
{
public EstimatedHistogram getHistogram(SSTableReader reader)
{
return reader.getEstimatedColumnCount();
}
});
}
});
sstablesPerReadHistogram = createColumnFamilyHistogram("SSTablesPerReadHistogram", cfs.keyspace.metric.sstablesPerReadHistogram);
compressionRatio = createColumnFamilyGauge("CompressionRatio", new Gauge<Double>()
{
public Double value()
{
double sum = 0;
int total = 0;
for (SSTableReader sstable : cfs.getSSTables())
{
if (sstable.getCompressionRatio() != MetadataCollector.NO_COMPRESSION_RATIO)
{
sum += sstable.getCompressionRatio();
total++;
}
}
return total != 0 ? sum / total : 0;
}
}, new Gauge<Double>() // global gauge
{
public Double value()
{
double sum = 0;
int total = 0;
for (Keyspace keyspace : Keyspace.all())
{
for (SSTableReader sstable : keyspace.getAllSSTables())
{
if (sstable.getCompressionRatio() != MetadataCollector.NO_COMPRESSION_RATIO)
{
sum += sstable.getCompressionRatio();
total++;
}
}
}
return total != 0 ? sum / total : 0;
}
});
readLatency = new LatencyMetrics(factory, "Read", cfs.keyspace.metric.readLatency, globalReadLatency);
writeLatency = new LatencyMetrics(factory, "Write", cfs.keyspace.metric.writeLatency, globalWriteLatency);
rangeLatency = new LatencyMetrics(factory, "Range", cfs.keyspace.metric.rangeLatency, globalRangeLatency);
pendingFlushes = createColumnFamilyCounter("PendingFlushes");
pendingCompactions = createColumnFamilyGauge("PendingCompactions", new Gauge<Integer>()
{
public Integer value()
{
return cfs.getCompactionStrategy().getEstimatedRemainingTasks();
}
});
liveSSTableCount = createColumnFamilyGauge("LiveSSTableCount", new Gauge<Integer>()
{
public Integer value()
{
return cfs.getDataTracker().getSSTables().size();
}
});
liveDiskSpaceUsed = createColumnFamilyCounter("LiveDiskSpaceUsed");
totalDiskSpaceUsed = createColumnFamilyCounter("TotalDiskSpaceUsed");
minRowSize = createColumnFamilyGauge("MinRowSize", new Gauge<Long>()
{
public Long value()
{
long min = 0;
for (SSTableReader sstable : cfs.getSSTables())
{
if (min == 0 || sstable.getEstimatedRowSize().min() < min)
min = sstable.getEstimatedRowSize().min();
}
return min;
}
}, new Gauge<Long>() // global gauge
{
public Long value()
{
long min = Long.MAX_VALUE;
for (Metric cfGauge : allColumnFamilyMetrics.get("MinRowSize"))
{
min = Math.min(min, ((Gauge<? extends Number>) cfGauge).value().longValue());
}
return min;
}
});
maxRowSize = createColumnFamilyGauge("MaxRowSize", new Gauge<Long>()
{
public Long value()
{
long max = 0;
for (SSTableReader sstable : cfs.getSSTables())
{
if (sstable.getEstimatedRowSize().max() > max)
max = sstable.getEstimatedRowSize().max();
}
return max;
}
}, new Gauge<Long>() // global gauge
{
public Long value()
{
long max = 0;
for (Metric cfGauge : allColumnFamilyMetrics.get("MaxRowSize"))
{
max = Math.max(max, ((Gauge<? extends Number>) cfGauge).value().longValue());
}
return max;
}
});
meanRowSize = createColumnFamilyGauge("MeanRowSize", new Gauge<Long>()
{
public Long value()
{
long sum = 0;
long count = 0;
for (SSTableReader sstable : cfs.getSSTables())
{
long n = sstable.getEstimatedRowSize().count();
sum += sstable.getEstimatedRowSize().mean() * n;
count += n;
}
return count > 0 ? sum / count : 0;
}
}, new Gauge<Long>() // global gauge
{
public Long value()
{
long sum = 0;
long count = 0;
for (Keyspace keyspace : Keyspace.all())
{
for (SSTableReader sstable : keyspace.getAllSSTables())
{
long n = sstable.getEstimatedRowSize().count();
sum += sstable.getEstimatedRowSize().mean() * n;
count += n;
}
}
return count > 0 ? sum / count : 0;
}
});
bloomFilterFalsePositives = createColumnFamilyGauge("BloomFilterFalsePositives", new Gauge<Long>()
{
public Long value()
{
long count = 0L;
for (SSTableReader sstable: cfs.getSSTables())
count += sstable.getBloomFilterFalsePositiveCount();
return count;
}
});
recentBloomFilterFalsePositives = createColumnFamilyGauge("RecentBloomFilterFalsePositives", new Gauge<Long>()
{
public Long value()
{
long count = 0L;
for (SSTableReader sstable : cfs.getSSTables())
count += sstable.getRecentBloomFilterFalsePositiveCount();
return count;
}
});
bloomFilterFalseRatio = createColumnFamilyGauge("BloomFilterFalseRatio", new Gauge<Double>()
{
public Double value()
{
long falseCount = 0L;
long trueCount = 0L;
for (SSTableReader sstable : cfs.getSSTables())
{
falseCount += sstable.getBloomFilterFalsePositiveCount();
trueCount += sstable.getBloomFilterTruePositiveCount();
}
if (falseCount == 0L && trueCount == 0L)
return 0d;
return (double) falseCount / (trueCount + falseCount);
}
}, new Gauge<Double>() // global gauge
{
public Double value()
{
long falseCount = 0L;
long trueCount = 0L;
for (Keyspace keyspace : Keyspace.all())
{
for (SSTableReader sstable : keyspace.getAllSSTables())
{
falseCount += sstable.getBloomFilterFalsePositiveCount();
trueCount += sstable.getBloomFilterTruePositiveCount();
}
}
if (falseCount == 0L && trueCount == 0L)
return 0d;
return (double) falseCount / (trueCount + falseCount);
}
});
recentBloomFilterFalseRatio = createColumnFamilyGauge("RecentBloomFilterFalseRatio", new Gauge<Double>()
{
public Double value()
{
long falseCount = 0L;
long trueCount = 0L;
for (SSTableReader sstable: cfs.getSSTables())
{
falseCount += sstable.getRecentBloomFilterFalsePositiveCount();
trueCount += sstable.getRecentBloomFilterTruePositiveCount();
}
if (falseCount == 0L && trueCount == 0L)
return 0d;
return (double) falseCount / (trueCount + falseCount);
}
}, new Gauge<Double>() // global gauge
{
public Double value()
{
long falseCount = 0L;
long trueCount = 0L;
for (Keyspace keyspace : Keyspace.all())
{
for (SSTableReader sstable : keyspace.getAllSSTables())
{
falseCount += sstable.getRecentBloomFilterFalsePositiveCount();
trueCount += sstable.getRecentBloomFilterTruePositiveCount();
}
}
if (falseCount == 0L && trueCount == 0L)
return 0d;
return (double) falseCount / (trueCount + falseCount);
}
});
bloomFilterDiskSpaceUsed = createColumnFamilyGauge("BloomFilterDiskSpaceUsed", new Gauge<Long>()
{
public Long value()
{
long total = 0;
for (SSTableReader sst : cfs.getSSTables())
total += sst.getBloomFilterSerializedSize();
return total;
}
});
bloomFilterOffHeapMemoryUsed = createColumnFamilyGauge("BloomFilterOffHeapMemoryUsed", new Gauge<Long>()
{
public Long value()
{
long total = 0;
for (SSTableReader sst : cfs.getSSTables())
total += sst.getBloomFilterOffHeapSize();
return total;
}
});
indexSummaryOffHeapMemoryUsed = createColumnFamilyGauge("IndexSummaryOffHeapMemoryUsed", new Gauge<Long>()
{
public Long value()
{
long total = 0;
for (SSTableReader sst : cfs.getSSTables())
total += sst.getIndexSummaryOffHeapSize();
return total;
}
});
compressionMetadataOffHeapMemoryUsed = createColumnFamilyGauge("CompressionMetadataOffHeapMemoryUsed", new Gauge<Long>()
{
public Long value()
{
long total = 0;
for (SSTableReader sst : cfs.getSSTables())
total += sst.getCompressionMetadataOffHeapSize();
return total;
}
});
speculativeRetries = createColumnFamilyCounter("SpeculativeRetries");
keyCacheHitRate = Metrics.newGauge(factory.createMetricName("KeyCacheHitRate"), new RatioGauge()
{
protected double getNumerator()
{
long hits = 0L;
for (SSTableReader sstable : cfs.getSSTables())
hits += sstable.getKeyCacheHit();
return hits;
}
protected double getDenominator()
{
long requests = 0L;
for (SSTableReader sstable : cfs.getSSTables())
requests += sstable.getKeyCacheRequest();
return Math.max(requests, 1); // to avoid NaN.
}
});
tombstoneScannedHistogram = createColumnFamilyHistogram("TombstoneScannedHistogram", cfs.keyspace.metric.tombstoneScannedHistogram);
liveScannedHistogram = createColumnFamilyHistogram("LiveScannedHistogram", cfs.keyspace.metric.liveScannedHistogram);
colUpdateTimeDeltaHistogram = createColumnFamilyHistogram("ColUpdateTimeDeltaHistogram", cfs.keyspace.metric.colUpdateTimeDeltaHistogram);
coordinatorReadLatency = Metrics.newTimer(factory.createMetricName("CoordinatorReadLatency"), TimeUnit.MICROSECONDS, TimeUnit.SECONDS);
coordinatorScanLatency = Metrics.newTimer(factory.createMetricName("CoordinatorScanLatency"), TimeUnit.MICROSECONDS, TimeUnit.SECONDS);
waitingOnFreeMemtableSpace = Metrics.newTimer(factory.createMetricName("WaitingOnFreeMemtableSpace"), TimeUnit.MICROSECONDS, TimeUnit.SECONDS);
trueSnapshotsSize = createColumnFamilyGauge("SnapshotsSize", new Gauge<Long>()
{
public Long value()
{
return cfs.trueSnapshotsSize();
}
});
rowCacheHitOutOfRange = createColumnFamilyCounter("RowCacheHitOutOfRange");
rowCacheHit = createColumnFamilyCounter("RowCacheHit");
rowCacheMiss = createColumnFamilyCounter("RowCacheMiss");
casPrepare = new LatencyMetrics(factory, "CasPrepare", cfs.keyspace.metric.casPrepare);
casPropose = new LatencyMetrics(factory, "CasPropose", cfs.keyspace.metric.casPropose);
casCommit = new LatencyMetrics(factory, "CasCommit", cfs.keyspace.metric.casCommit);
}
public void updateSSTableIterated(int count)
{
sstablesPerReadHistogram.update(count);
recentSSTablesPerRead.add(count);
sstablesPerRead.add(count);
}
/**
* Release all associated metrics.
*/
public void release()
{
for(String name : all)
{
allColumnFamilyMetrics.get(name).remove(Metrics.defaultRegistry().allMetrics().get(factory.createMetricName(name)));
Metrics.defaultRegistry().removeMetric(factory.createMetricName(name));
}
readLatency.release();
writeLatency.release();
rangeLatency.release();
Metrics.defaultRegistry().removeMetric(factory.createMetricName("EstimatedRowSizeHistogram"));
Metrics.defaultRegistry().removeMetric(factory.createMetricName("EstimatedColumnCountHistogram"));
Metrics.defaultRegistry().removeMetric(factory.createMetricName("KeyCacheHitRate"));
Metrics.defaultRegistry().removeMetric(factory.createMetricName("CoordinatorReadLatency"));
Metrics.defaultRegistry().removeMetric(factory.createMetricName("CoordinatorScanLatency"));
Metrics.defaultRegistry().removeMetric(factory.createMetricName("WaitingOnFreeMemtableSpace"));
}
/**
* Create a gauge that will be part of a merged version of all column families. The global gauge
* will merge each CF gauge by adding their values
*/
protected <T extends Number> Gauge<T> createColumnFamilyGauge(final String name, Gauge<T> gauge)
{
return createColumnFamilyGauge(name, gauge, new Gauge<Long>()
{
public Long value()
{
long total = 0;
for (Metric cfGauge : allColumnFamilyMetrics.get(name))
{
total = total + ((Gauge<? extends Number>) cfGauge).value().longValue();
}
return total;
}
});
}
/**
* Create a gauge that will be part of a merged version of all column families. The global gauge
* is defined as the globalGauge parameter
*/
protected <G,T> Gauge<T> createColumnFamilyGauge(String name, Gauge<T> gauge, Gauge<G> globalGauge)
{
Gauge<T> cfGauge = Metrics.newGauge(factory.createMetricName(name), gauge);
if (register(name, cfGauge))
{
Metrics.newGauge(globalNameFactory.createMetricName(name), globalGauge);
}
return cfGauge;
}
/**
* Creates a counter that will also have a global counter thats the sum of all counters across
* different column families
*/
protected Counter createColumnFamilyCounter(final String name)
{
Counter cfCounter = Metrics.newCounter(factory.createMetricName(name));
if (register(name, cfCounter))
{
Metrics.newGauge(globalNameFactory.createMetricName(name), new Gauge<Long>()
{
public Long value()
{
long total = 0;
for (Metric cfGauge : allColumnFamilyMetrics.get(name))
{
total += ((Counter) cfGauge).count();
}
return total;
}
});
}
return cfCounter;
}
/**
* Create a histogram-like interface that will register both a CF, keyspace and global level
* histogram and forward any updates to both
*/
protected ColumnFamilyHistogram createColumnFamilyHistogram(String name, Histogram keyspaceHistogram)
{
Histogram cfHistogram = Metrics.newHistogram(factory.createMetricName(name), true);
register(name, cfHistogram);
return new ColumnFamilyHistogram(cfHistogram, keyspaceHistogram, Metrics.newHistogram(globalNameFactory.createMetricName(name), true));
}
/**
* Registers a metric to be removed when unloading CF.
* @return true if first time metric with that name has been registered
*/
private boolean register(String name, Metric metric)
{
boolean ret = allColumnFamilyMetrics.putIfAbsent(name, new HashSet<Metric>()) == null;
allColumnFamilyMetrics.get(name).add(metric);
all.add(name);
return ret;
}
public class ColumnFamilyHistogram
{
public final Histogram[] all;
public final Histogram cf;
private ColumnFamilyHistogram(Histogram cf, Histogram keyspace, Histogram global)
{
this.cf = cf;
this.all = new Histogram[]{cf, keyspace, global};
}
public void update(long i)
{
for(Histogram histo : all)
{
histo.update(i);
}
}
}
class ColumnFamilyMetricNameFactory implements MetricNameFactory
{
private final String keyspaceName;
private final String columnFamilyName;
private final boolean isIndex;
ColumnFamilyMetricNameFactory(ColumnFamilyStore cfs)
{
this.keyspaceName = cfs.keyspace.getName();
this.columnFamilyName = cfs.name;
isIndex = cfs.isIndex();
}
public MetricName createMetricName(String metricName)
{
String groupName = ColumnFamilyMetrics.class.getPackage().getName();
String type = isIndex ? "IndexColumnFamily" : "ColumnFamily";
StringBuilder mbeanName = new StringBuilder();
mbeanName.append(groupName).append(":");
mbeanName.append("type=").append(type);
mbeanName.append(",keyspace=").append(keyspaceName);
mbeanName.append(",scope=").append(columnFamilyName);
mbeanName.append(",name=").append(metricName);
return new MetricName(groupName, type, metricName, keyspaceName + "." + columnFamilyName, mbeanName.toString());
}
}
static class AllColumnFamilyMetricNameFactory implements MetricNameFactory
{
public MetricName createMetricName(String metricName)
{
String groupName = ColumnFamilyMetrics.class.getPackage().getName();
StringBuilder mbeanName = new StringBuilder();
mbeanName.append(groupName).append(":");
mbeanName.append("type=ColumnFamily");
mbeanName.append(",name=").append(metricName);
return new MetricName(groupName, "ColumnFamily", metricName, "all", mbeanName.toString());
}
}
public static enum Sampler
{
READS, WRITES
}
}