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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.metrics;
import java.util.Collections;
import java.util.EnumMap;
import java.util.Map;
import com.google.common.annotations.VisibleForTesting;
import com.codahale.metrics.Counter;
import com.codahale.metrics.Histogram;
import org.apache.cassandra.net.Verb;
import org.apache.cassandra.repair.messages.RepairMessage;
import static org.apache.cassandra.metrics.CassandraMetricsRegistry.Metrics;
public class RepairMetrics
{
public static final String TYPE_NAME = "Repair";
public static final Counter previewFailures = Metrics.counter(DefaultNameFactory.createMetricName(TYPE_NAME, "PreviewFailures", null));
public static final Histogram retries = Metrics.histogram(DefaultNameFactory.createMetricName(TYPE_NAME, "Retries", null), false);
public static final Map retriesByVerb;
public static final Counter retryTimeout = Metrics.counter(DefaultNameFactory.createMetricName(TYPE_NAME, "RetryTimeout", null));
public static final Map retryTimeoutByVerb;
public static final Counter retryFailure = Metrics.counter(DefaultNameFactory.createMetricName(TYPE_NAME, "RetryFailure", null));
public static final Map retryFailureByVerb;
static
{
Map retries = new EnumMap<>(Verb.class);
Map timeout = new EnumMap<>(Verb.class);
Map failure = new EnumMap<>(Verb.class);
for (Verb verb : RepairMessage.ALLOWS_RETRY)
{
retries.put(verb, Metrics.histogram(DefaultNameFactory.createMetricName(TYPE_NAME, "Retries-" + verb.name(), null), false));
timeout.put(verb, Metrics.counter(DefaultNameFactory.createMetricName(TYPE_NAME, "RetryTimeout-" + verb.name(), null)));
failure.put(verb, Metrics.counter(DefaultNameFactory.createMetricName(TYPE_NAME, "RetryFailure-" + verb.name(), null)));
}
retriesByVerb = Collections.unmodifiableMap(retries);
retryTimeoutByVerb = Collections.unmodifiableMap(timeout);
retryFailureByVerb = Collections.unmodifiableMap(failure);
}
public static void init()
{
// noop
}
@VisibleForTesting
public static void unsafeReset()
{
reset(previewFailures);
reset(retries);
retriesByVerb.values().forEach(RepairMetrics::reset);
reset(retryTimeout);
retryTimeoutByVerb.values().forEach(RepairMetrics::reset);
reset(retryFailure);
retryFailureByVerb.values().forEach(RepairMetrics::reset);
}
private static void reset(Histogram retries)
{
((ClearableHistogram) retries).clear();
}
private static void reset(Counter counter)
{
counter.dec(counter.getCount());
}
public static void retry(Verb verb, int attempt)
{
retries.update(attempt);
retriesByVerb.get(verb).update(attempt);
}
public static void retryTimeout(Verb verb)
{
retryTimeout.inc();
retryTimeoutByVerb.get(verb).inc();
}
public static void retryFailure(Verb verb)
{
retryFailure.inc();
retryFailureByVerb.get(verb).inc();
}
}