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Rohini Palaniswamy commented on TEZ-3831:
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+1. Looks good to me
> 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
> Attachments: Screen Shot 2017-09-13 at 4.55.11 PM.png, 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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