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Server functionality for HBase
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/**
 *
 * 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 java.io.IOException;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.hbase.CompatibilitySingletonFactory;
import org.apache.hadoop.hbase.HRegionInfo;
import org.apache.hadoop.hbase.HTableDescriptor;
import org.apache.hadoop.util.StringUtils;

import com.google.common.annotations.VisibleForTesting;


/**
 * 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 implements WALActionsListener {
  static final Log LOG = LogFactory.getLog(MetricsWAL.class);

  private final MetricsWALSource source;

  public MetricsWAL() {
    this(CompatibilitySingletonFactory.getInstance(MetricsWALSource.class));
  }

  @VisibleForTesting
  MetricsWAL(MetricsWALSource s) {
    this.source = s;
  }

  public void finishSync(long time) {
    source.incrementSyncTime(time);
  }

  public void finishAppend(long time, long size) {

    source.incrementAppendCount();
    source.incrementAppendTime(time);
    source.incrementAppendSize(size);
    source.incrementWrittenBytes(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)));
    }
  }

  @Override
  public void logRollRequested(boolean underReplicated) {
    source.incrementLogRollRequested();
    if (underReplicated) {
      source.incrementLowReplicationLogRoll();
    }
  }

  @Override
  public void preLogRoll(Path oldPath, Path newPath) throws IOException {
  }

  @Override
  public void postLogRoll(Path oldPath, Path newPath) throws IOException {
  }

  @Override
  public void preLogArchive(Path oldPath, Path newPath) throws IOException {
  }

  @Override
  public void postLogArchive(Path oldPath, Path newPath) throws IOException {
  }

  @Override
  public void logCloseRequested() {
  }

  @Override
  public void visitLogEntryBeforeWrite(HRegionInfo info, HLogKey logKey, WALEdit logEdit) {
  }

  @Override
  public void visitLogEntryBeforeWrite(HTableDescriptor htd, HLogKey logKey, WALEdit logEdit) {
  }
}