@Override
  protected SyncReplicationReplayWALState getInitialState() {
    return SyncReplicationReplayWALState.ASSIGN_WORKER;
  }
The procedure for replaying a set of remote wals. It will get an available region server and
schedule a {@link SyncReplicationReplayWALRemoteProcedure} to actually send the request to region
server.
hbase-server/src/main/java/org/apache/hadoop/hbase/master/replication/SyncReplicationReplayWALProcedure.java