@Override
  protected boolean abort(MasterProcedureEnv env) {
    return false;
  }
Only truncate wals one by one when task succeed. The parent procedure will check the first wal
length to know whether this task succeed.
hbase-server/src/main/java/org/apache/hadoop/hbase/master/replication/SyncReplicationReplayWALRemoteProcedure.java