Rajesh Balamohan created TEZ-2834:
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Summary: tez app hangs at large scale (~30TB)
Key: TEZ-2834
URL: https://issues.apache.org/jira/browse/TEZ-2834
Project: Apache Tez
Issue Type: Bug
Affects Versions: 0.7.1
Reporter: Rajesh Balamohan
Will attach the DAG.
Repro for reference: TPC-DS q_70 @ 30 TB scale.
"Map 7" completes in 2 waves. Output is very tiny, so reducer 8 gets launched
slightly late. But before "Reducer 9" can get scheduled, slots are taken up by
"Map 1", which is not preempted for running "Reducer 9".
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