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https://issues.apache.org/jira/browse/TEZ-3831?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16168408#comment-16168408
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Kuhu Shukla commented on TEZ-3831:
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Thanks [~jeagles] for the additional patch. Using NullFetchedInput looks fine
to me. The adjust call will add this input and that would cover cases of all
empty partitions and some empty partitions.
+1. Will commit this shortly.
> Reduce Unordered memory needed for storing empty completed events
> -----------------------------------------------------------------
>
> Key: TEZ-3831
> URL: https://issues.apache.org/jira/browse/TEZ-3831
> Project: Apache Tez
> Issue Type: Bug
> Reporter: Jonathan Eagles
> Assignee: Jonathan Eagles
> Fix For: 0.9.1
>
> Attachments: Screen Shot 2017-09-13 at 4.55.11 PM.png,
> TEZ-3831.001-addendum.patch, TEZ-3831.001.patch
>
>
> the completedInputs blocking queue is used to store inputs for the
> UnorderedKVReader to consume. With Auto-reduce parallelism enabled and nearly
> all empty inputs, the reader can't prune the empty events from the blocking
> queue fast enough to keep up. In my scenario, an OOM occurred.
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