public String sinkToString() {
    if (this.replicationLoadSink == null) return null;

    StringBuilder sb = new StringBuilder();
    sb = Strings.appendKeyValue(sb, "AgeOfLastAppliedOp",
      this.replicationLoadSink.getAgeOfLastAppliedOp());
    sb = Strings.appendKeyValue(sb, "TimestampsOfLastAppliedOp",
      (new Date(this.replicationLoadSink.getTimeStampsOfLastAppliedOp()).toString()));

    return sb.toString();
  }
sinkToString
@return a string contains sinkReplicationLoad information
hbase-server/src/main/java/org/apache/hadoop/hbase/replication/regionserver/ReplicationLoad.java