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https://issues.apache.org/jira/browse/TEZ-3452?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15545549#comment-15545549
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Jonathan Eagles commented on TEZ-3452:
--------------------------------------
[~hitesh], [~rajesh.balamohan], [~bikassaha], [~sseth].
Total source output size calculation now is only approximate and could cause
some confusion. Let me know if you prefer and I can use exact method and
fallback if overflow is detected.
> Auto-reduce parallelism calculation can overflow with large inputs
> ------------------------------------------------------------------
>
> Key: TEZ-3452
> URL: https://issues.apache.org/jira/browse/TEZ-3452
> Project: Apache Tez
> Issue Type: Bug
> Reporter: Jonathan Eagles
> Assignee: Jonathan Eagles
> Attachments: TEZ-3452.1.patch, TEZ-3452.2.patch
>
>
> Overflow can occur when the numTasks is high (say 45000) and outputSize is
> high (say 311TB) and slow start is set to 1.0.
> {code:title=ShuffleVertexManager}
> for (Map.Entry<String, SourceVertexInfo> vInfo : getBipartiteInfo()) {
> SourceVertexInfo srcInfo = vInfo.getValue();
> if (srcInfo.numTasks > 0 && srcInfo.numVMEventsReceived > 0) {
> // this assumes that 1 vmEvent is received per completed task -
> TEZ-2961
> expectedTotalSourceTasksOutputSize +=
> (srcInfo.numTasks * srcInfo.outputSize) /
> srcInfo.numVMEventsReceived;
> }
> }
> {code}
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