001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.io;
019
020import org.apache.hadoop.hbase.metrics.BaseSource;
021import org.apache.yetus.audience.InterfaceAudience;
022
023@InterfaceAudience.Private
024public interface MetricsIOSource extends BaseSource {
025
026  /**
027   * The name of the metrics
028   */
029  String METRICS_NAME = "IO";
030
031  /**
032   * The name of the metrics context that metrics will be under.
033   */
034  String METRICS_CONTEXT = "regionserver";
035
036  /**
037   * Description
038   */
039  String METRICS_DESCRIPTION = "Metrics about FileSystem IO";
040
041  /**
042   * The name of the metrics context that metrics will be under in jmx
043   */
044  String METRICS_JMX_CONTEXT = "RegionServer,sub=" + METRICS_NAME;
045
046  String FS_READ_TIME_HISTO_KEY = "fsReadTime";
047  String FS_PREAD_TIME_HISTO_KEY = "fsPReadTime";
048  String FS_WRITE_HISTO_KEY = "fsWriteTime";
049
050  String CHECKSUM_FAILURES_KEY = "fsChecksumFailureCount";
051
052  String FS_READ_TIME_HISTO_DESC =
053    "Latency of HFile's sequential reads on this region server in milliseconds";
054  String FS_PREAD_TIME_HISTO_DESC =
055    "Latency of HFile's positional reads on this region server in milliseconds";
056  String FS_WRITE_TIME_HISTO_DESC =
057    "Latency of HFile's writes on this region server in milliseconds";
058
059  String CHECKSUM_FAILURES_DESC = "Number of checksum failures for the HBase HFile checksums at the"
060    + " HBase level (separate from HDFS checksums)";
061
062  /**
063   * Update the fs sequential read time histogram
064   * @param t time it took, in milliseconds
065   */
066  void updateFsReadTime(long t);
067
068  /**
069   * Update the fs positional read time histogram
070   * @param t time it took, in milliseconds
071   */
072  void updateFsPReadTime(long t);
073
074  /**
075   * Update the fs write time histogram
076   * @param t time it took, in milliseconds
077   */
078  void updateFsWriteTime(long t);
079}