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Interfaces to be implemented in order to smooth over hadoop version differences
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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 org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.metrics.BaseSource;
import org.apache.yetus.audience.InterfaceAudience;

/**
 * Interface of the source that will export metrics about the region server's WAL.
 */
@InterfaceAudience.Private
public interface MetricsWALSource extends BaseSource {

  /**
   * The name of the metrics
   */
  String METRICS_NAME = "WAL";

  /**
   * The name of the metrics context that metrics will be under.
   */
  String METRICS_CONTEXT = "regionserver";

  /**
   * Description
   */
  String METRICS_DESCRIPTION = "Metrics about HBase RegionServer WAL";

  /**
   * The name of the metrics context that metrics will be under in jmx
   */
  String METRICS_JMX_CONTEXT = "RegionServer,sub=" + METRICS_NAME;

  String APPEND_TIME = "appendTime";
  String APPEND_TIME_DESC = "Time an append to the log took.";
  String APPEND_COUNT = "appendCount";
  String APPEND_COUNT_DESC = "Number of appends to the write ahead log.";
  String APPEND_SIZE = "appendSize";
  String APPEND_SIZE_DESC = "Size (in bytes) of the data appended to the WAL.";
  String SLOW_APPEND_COUNT = "slowAppendCount";
  String SLOW_APPEND_COUNT_DESC = "Number of appends that were slow.";
  String SYNC_TIME = "syncTime";
  String SYNC_TIME_DESC = "The time it took to sync the WAL to HDFS.";
  String ROLL_REQUESTED = "rollRequest";
  String ROLL_REQUESTED_DESC = "How many times a roll has been requested total";
  String ERROR_ROLL_REQUESTED = "errorRollRequest";
  String ERROR_ROLL_REQUESTED_DESC =
    "How many times a roll was requested due to I/O or other errors.";
  String LOW_REPLICA_ROLL_REQUESTED = "lowReplicaRollRequest";
  String LOW_REPLICA_ROLL_REQUESTED_DESC =
    "How many times a roll was requested due to too few datanodes in the write pipeline.";
  String SLOW_SYNC_ROLL_REQUESTED = "slowSyncRollRequest";
  String SLOW_SYNC_ROLL_REQUESTED_DESC =
    "How many times a roll was requested due to sync too slow on the write pipeline.";
  String SIZE_ROLL_REQUESTED = "sizeRollRequest";
  String SIZE_ROLL_REQUESTED_DESC =
    "How many times a roll was requested due to file size roll threshold.";
  String WRITTEN_BYTES = "writtenBytes";
  String WRITTEN_BYTES_DESC = "Size (in bytes) of the data written to the WAL.";
  String SUCCESSFUL_LOG_ROLLS = "successfulLogRolls";
  String SUCCESSFUL_LOG_ROLLS_DESC = "Number of successful log rolls requests";

  /**
   * Add the append size.
   */
  void incrementAppendSize(TableName tableName, long size);

  /**
   * Add the time it took to append.
   */
  void incrementAppendTime(long time);

  /**
   * Increment the count of wal appends
   */
  void incrementAppendCount(TableName tableName);

  /**
   * Increment the number of appends that were slow
   */
  void incrementSlowAppendCount();

  /**
   * Add the time it took to sync the wal.
   */
  void incrementSyncTime(long time);

  void incrementLogRollRequested();

  void incrementErrorLogRoll();

  void incrementLowReplicationLogRoll();

  long getSlowAppendCount();

  void incrementSlowSyncLogRoll();

  void incrementSizeLogRoll();

  void incrementWrittenBytes(long val);

  /**
   * Increment the number of successful log roll requests.
   */
  void incrementSuccessfulLogRolls();

  long getSuccessfulLogRolls();
}