public void setTimeStampNextToReplicate(long timeStampNextToReplicate) {
    this.timeStampNextToReplicate = timeStampNextToReplicate;
  }
TimeStamp of next edit targeted for replication. Used for calculating lag, as if this timestamp
is greater than timestamp of last shipped, it means there's at least one edit pending
replication.
@param timeStampNextToReplicate timestamp of next edit in the queue that should be replicated.
hbase-server/src/main/java/org/apache/hadoop/hbase/replication/regionserver/MetricsSource.java