Xuefu Zhang created SPARK-4921:
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Summary: Performance issue caused by TaskSetManager returning
PROCESS_LOCAL for NO_PREF tasks
Key: SPARK-4921
URL: https://issues.apache.org/jira/browse/SPARK-4921
Project: Spark
Issue Type: Bug
Components: Spark Core
Affects Versions: 1.2.0
Reporter: Xuefu Zhang
During research for HIVE-9153, we found that TaskSetManager returns
PROCESS_LOCAL for NO_PREF tasks, which may caused performance degradation.
Changing the return value to NO_PREF, as demonstrated in the attached patch,
seemingly improves the performance.
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