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Posted to issues@spark.apache.org by "Xuefu Zhang (JIRA)" <ji...@apache.org> on 2014/12/22 19:35:13 UTC

[jira] [Created] (SPARK-4921) Performance issue caused by TaskSetManager returning PROCESS_LOCAL for NO_PREF tasks

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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