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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
* limitations under the License.
*/
package org.apache.cassandra.index.sai.metrics;
import java.util.concurrent.TimeUnit;
import com.codahale.metrics.Counter;
import com.codahale.metrics.Histogram;
import com.codahale.metrics.Timer;
import org.apache.cassandra.index.sai.QueryContext;
import org.apache.cassandra.schema.TableMetadata;
import org.apache.cassandra.tracing.Tracing;
import static org.apache.cassandra.metrics.CassandraMetricsRegistry.Metrics;
public class TableQueryMetrics extends AbstractMetrics
{
public static final String TABLE_QUERY_METRIC_TYPE = "TableQueryMetrics";
private final PerQueryMetrics perQueryMetrics;
private final Counter totalQueryTimeouts;
private final Counter totalPartitionReads;
private final Counter totalRowsFiltered;
private final Counter totalQueriesCompleted;
public TableQueryMetrics(TableMetadata table)
{
super(table.keyspace, table.name, TABLE_QUERY_METRIC_TYPE);
perQueryMetrics = new PerQueryMetrics(table);
totalPartitionReads = Metrics.counter(createMetricName("TotalPartitionReads"));
totalRowsFiltered = Metrics.counter(createMetricName("TotalRowsFiltered"));
totalQueriesCompleted = Metrics.counter(createMetricName("TotalQueriesCompleted"));
totalQueryTimeouts = Metrics.counter(createMetricName("TotalQueryTimeouts"));
}
public void record(QueryContext queryContext)
{
if (queryContext.queryTimedOut)
totalQueryTimeouts.inc();
perQueryMetrics.record(queryContext);
}
public void release()
{
super.release();
perQueryMetrics.release();
}
public class PerQueryMetrics extends AbstractMetrics
{
private final Timer queryLatency;
/**
* Global metrics for all indices hit during the query.
*/
private final Histogram sstablesHit;
private final Histogram segmentsHit;
private final Histogram partitionReads;
private final Histogram rowsFiltered;
/**
* Balanced tree index metrics.
*/
private final Histogram balancedTreePostingsNumPostings;
/**
* Balanced tree index posting lists metrics.
*/
private final Histogram balancedTreePostingsSkips;
private final Histogram balancedTreePostingsDecodes;
/**
* Trie index posting lists metrics.
*/
private final Histogram postingsSkips;
private final Histogram postingsDecodes;
public PerQueryMetrics(TableMetadata table)
{
super(table.keyspace, table.name, "PerQuery");
queryLatency = Metrics.timer(createMetricName("QueryLatency"));
sstablesHit = Metrics.histogram(createMetricName("SSTableIndexesHit"), false);
segmentsHit = Metrics.histogram(createMetricName("IndexSegmentsHit"), false);
balancedTreePostingsSkips = Metrics.histogram(createMetricName("BalancedTreePostingsSkips"), false);
balancedTreePostingsNumPostings = Metrics.histogram(createMetricName("BalancedTreePostingsNumPostings"), false);
balancedTreePostingsDecodes = Metrics.histogram(createMetricName("BalancedTreePostingsDecodes"), false);
postingsSkips = Metrics.histogram(createMetricName("PostingsSkips"), false);
postingsDecodes = Metrics.histogram(createMetricName("PostingsDecodes"), false);
partitionReads = Metrics.histogram(createMetricName("PartitionReads"), false);
rowsFiltered = Metrics.histogram(createMetricName("RowsFiltered"), false);
}
private void recordStringIndexCacheMetrics(QueryContext events)
{
postingsSkips.update(events.triePostingsSkips);
postingsDecodes.update(events.triePostingsDecodes);
}
private void recordNumericIndexCacheMetrics(QueryContext events)
{
balancedTreePostingsNumPostings.update(events.balancedTreePostingListsHit);
balancedTreePostingsSkips.update(events.balancedTreePostingsSkips);
balancedTreePostingsDecodes.update(events.balancedTreePostingsDecodes);
}
public void record(QueryContext queryContext)
{
final long totalQueryTimeNs = queryContext.totalQueryTimeNs();
queryLatency.update(totalQueryTimeNs, TimeUnit.NANOSECONDS);
final long queryLatencyMicros = TimeUnit.NANOSECONDS.toMicros(totalQueryTimeNs);
sstablesHit.update(queryContext.sstablesHit);
segmentsHit.update(queryContext.segmentsHit);
partitionReads.update(queryContext.partitionsRead);
totalPartitionReads.inc(queryContext.partitionsRead);
rowsFiltered.update(queryContext.rowsFiltered);
totalRowsFiltered.inc(queryContext.rowsFiltered);
if (Tracing.isTracing())
{
Tracing.trace("Index query accessed memtable indexes, {}, and {}, post-filtered {} in {}, and took {} microseconds.",
pluralize(queryContext.sstablesHit, "SSTable index", "es"), pluralize(queryContext.segmentsHit, "segment", "s"),
pluralize(queryContext.rowsFiltered, "row", "s"), pluralize(queryContext.partitionsRead, "partition", "s"),
queryLatencyMicros);
}
if (queryContext.trieSegmentsHit > 0)
{
recordStringIndexCacheMetrics(queryContext);
}
if (queryContext.balancedTreeSegmentsHit > 0)
{
recordNumericIndexCacheMetrics(queryContext);
}
totalQueriesCompleted.inc();
}
}
private String pluralize(long count, String root, String plural)
{
return count == 1 ? String.format("1 %s", root) : String.format("%d %s%s", count, root, plural);
}
}