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Posted to issues@tez.apache.org by "Jonathan Eagles (JIRA)" <ji...@apache.org> on 2017/09/13 21:49:00 UTC

[jira] [Created] (TEZ-3831) Reduce Unordered memory needed for storing empty completed events

Jonathan Eagles created TEZ-3831:
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             Summary: 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


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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