@Override
  public void abort() {
    // this will stop run() from pushing records, along with potentially
    // blocking initialization.
    super.abort();

    if (reducer != null) {
      LOG.info("Forwarding abort to reducer: {} " + reducer.getName());
      reducer.abort();
    } else {
      LOG.info("reducer not setup yet. abort not being forwarded");
    }
  }
Process input from tez LogicalInput and write output - for a map plan
Just pump the records through the query plan.
ql/src/java/org/apache/hadoop/hive/ql/exec/tez/ReduceRecordProcessor.java