@Override
  protected void rollbackState(MasterProcedureEnv env, SyncReplicationReplayWALState state)
    throws IOException, InterruptedException {
    if (state == getInitialState()) {
      return;
    }
    throw new UnsupportedOperationException();
  }
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