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package org.apache.hadoop.hbase.replication.regionserver;
This class is for maintaining the various replication statistics for a sink and publishing them through the metrics interfaces.
public class MetricsSink {
  public static final String SINK_AGE_OF_LAST_APPLIED_OP =
  public static final String SINK_APPLIED_BATCHES =
  public static final String SINK_APPLIED_OPS =
  private long lastTimestampForAge = System.currentTimeMillis();
  private final MetricsReplicationSinkSource mss;
  public MetricsSink() {
     = CompatibilitySingletonFactory.getInstance(MetricsReplicationSourceFactory.class)

Set the age of the last applied operation

timestamp The timestamp of the last operation applied.
the age that was set
  public long setAgeOfLastAppliedOp(long timestamp) {
    long age = 0;
    if ( != timestamp) {
       = timestamp;
      age = System.currentTimeMillis() - ;
    return age;

Refreshing the age makes sure the value returned is the actual one and not the one set a replication time

refreshed age
  public long refreshAgeOfLastAppliedOp() {

Convience method to change metrics when a batch of operations are applied.

  public void applyBatch(long batchSize) {
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