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https://issues.apache.org/jira/browse/TEZ-1942?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14276473#comment-14276473
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Hitesh Shah commented on TEZ-1942:
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[~rajesh.balamohan] Mind attaching the output for
timelinehost:8188/ws/v1/timeline/TEZ_VERTEX_ID/<vertexId>/ for the vertex in
question.
> 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
> Attachments: Screen Shot 2015-01-14 at 9.18.21 AM.png, Screen Shot
> 2015-01-14 at 9.18.54 AM.png
>
>
> 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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