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https://issues.apache.org/jira/browse/TEZ-1163?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14049611#comment-14049611
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Gopal V commented on TEZ-1163:
------------------------------
[~rajesh.balamohan]: Seems like a simple enough safety net, +1.
> Tez Auto Reducer-parallelism throws Divide-by-Zero
> --------------------------------------------------
>
> Key: TEZ-1163
> URL: https://issues.apache.org/jira/browse/TEZ-1163
> Project: Apache Tez
> Issue Type: Bug
> Affects Versions: 0.5.0
> Reporter: Gopal V
> Assignee: Rajesh Balamohan
> Priority: Minor
> Attachments: TEZ-1163.1.patch
>
>
> When the per-reducer estimate is set to 256Mb and over-all data output is
> ~200Mb, gets a divide-by-zero.
> {code}
> 2014-05-31 16:17:29,125 FATAL [AsyncDispatcher event handler]
> org.apache.hadoop.yarn.event.AsyncDispatcher: Error in dispatcher thread
> java.lang.ArithmeticException: / by zero
> at
> org.apache.tez.dag.library.vertexmanager.ShuffleVertexManager.determineParallelismAndApply(ShuffleVertexManager.java:392)
> at
> org.apache.tez.dag.library.vertexmanager.ShuffleVertexManager.schedulePendingTasks(ShuffleVertexManager.java:446)
> {code}
> Because of incorrect value set for minTasks
> {code}
> vertexmanager.ShuffleVertexManager: Shuffle Vertex Manager: settings
> minFrac:0.25 maxFrac:0.75 auto:true desiredTaskIput:256000000 minTasks:0
> {code}
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