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Posted to issues@tez.apache.org by "Rajesh Balamohan (JIRA)" <ji...@apache.org> on 2015/01/14 04:52:34 UTC

[jira] [Created] (TEZ-1942) Number of tasks show in Tez UI with auto-reduce parallelism is misleading

Rajesh Balamohan created TEZ-1942:
-------------------------------------

             Summary: Number of tasks show in Tez UI with auto-reduce parallelism is misleading
                 Key: TEZ-1942
                 URL: https://issues.apache.org/jira/browse/TEZ-1942
             Project: Apache Tez
          Issue Type: Bug
            Reporter: Rajesh Balamohan


Ran a simple hive query (with tez) and "--hiveconf hive.tez.auto.reducer.parallelism=true" .  This internally turns on tez's auto reduce parallelism.  

- Job started off with 1009 reduce tasks
- Tez reduces the number of reducers to 253
- Job completes successfully, but TEZ UI shows 1009 as the number of reducers (and 253 tasks as successful tasks).  This can be a little misleading.

I will attach the screenshots soon.



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