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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
/*
* 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
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*/
package org.apache.cassandra.metrics;
import com.codahale.metrics.Counter;
import static org.apache.cassandra.metrics.CassandraMetricsRegistry.Metrics;
public class TrieMemtableMetricsView
{
private static final String UNCONTENDED_PUTS = "Uncontended memtable puts";
private static final String CONTENDED_PUTS = "Contended memtable puts";
private static final String CONTENTION_TIME = "Contention time";
private static final String LAST_FLUSH_SHARD_SIZES = "Shard sizes during last flush";
// the number of memtable puts that did not need to wait on write lock
public final Counter uncontendedPuts;
// the number of memtable puts that needed to wait on write lock
public final Counter contendedPuts;
// shard put contention measurements
public final LatencyMetrics contentionTime;
// shard sizes distribution
public final MinMaxAvgMetric lastFlushShardDataSizes;
private final TrieMemtableMetricNameFactory factory;
public TrieMemtableMetricsView(String keyspace, String table)
{
factory = new TrieMemtableMetricNameFactory(keyspace, table);
uncontendedPuts = Metrics.counter(factory.createMetricName(UNCONTENDED_PUTS));
contendedPuts = Metrics.counter(factory.createMetricName(CONTENDED_PUTS));
contentionTime = new LatencyMetrics(factory, CONTENTION_TIME);
lastFlushShardDataSizes = new MinMaxAvgMetric(factory, LAST_FLUSH_SHARD_SIZES);
}
public void release()
{
Metrics.remove(factory.createMetricName(UNCONTENDED_PUTS));
Metrics.remove(factory.createMetricName(CONTENDED_PUTS));
contentionTime.release();
lastFlushShardDataSizes.release();
}
static class TrieMemtableMetricNameFactory implements MetricNameFactory
{
private final String keyspace;
private final String table;
TrieMemtableMetricNameFactory(String keyspace, String table)
{
this.keyspace = keyspace;
this.table = table;
}
public CassandraMetricsRegistry.MetricName createMetricName(String metricName)
{
String groupName = TableMetrics.class.getPackage().getName();
String type = "TrieMemtable";
StringBuilder mbeanName = new StringBuilder();
mbeanName.append(groupName).append(":");
mbeanName.append("type=").append(type);
mbeanName.append(",keyspace=").append(keyspace);
mbeanName.append(",scope=").append(table);
mbeanName.append(",name=").append(metricName);
return new CassandraMetricsRegistry.MetricName(groupName, type, metricName, keyspace + "." + table, mbeanName.toString());
}
}
}
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