/**
*
* 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.hadoop.hbase.regionserver.wal;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.hbase.CompatibilitySingletonFactory;
import org.apache.hadoop.util.StringUtils;
/**
* Class used to push numbers about the WAL into the metrics subsystem. This will take a
* single function call and turn it into multiple manipulations of the hadoop metrics system.
*/
@InterfaceAudience.Private
public class MetricsWAL {
static final Log LOG = LogFactory.getLog(MetricsWAL.class);
private final MetricsWALSource source;
public MetricsWAL() {
source = CompatibilitySingletonFactory.getInstance(MetricsWALSource.class);
}
public void finishSync(long time) {
source.incrementSyncTime(time);
}
public void finishAppend(long time, long size) {
source.incrementAppendCount();
source.incrementAppendTime(time);
source.incrementAppendSize(size);
if (time > 1000) {
source.incrementSlowAppendCount();
LOG.warn(String.format("%s took %d ms appending an edit to hlog; len~=%s",
Thread.currentThread().getName(),
time,
StringUtils.humanReadableInt(size)));
}
}
}