private void closeWriters(boolean abort) throws HiveException {
    fpaths.closeWriters(true, null);
    closeRecordwriters(true);
  }
Report status to JT so that JT won't kill this task if closing takes too long
due to too many files to close and the NN is overloaded.

@return true if a new progress update is reported, false otherwise.
ql/src/java/org/apache/hadoop/hive/ql/exec/FileSinkOperator.java