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From "Rajesh Balamohan (Jira)" <j...@apache.org>
Subject [jira] [Created] (TEZ-4087) Shuffle: Check for thread's liveliness regularly to avoid infinite wait in merger & referee threads
Date Mon, 07 Oct 2019 00:28:00 GMT
Rajesh Balamohan created TEZ-4087:
-------------------------------------

             Summary: Shuffle: Check for thread's liveliness regularly to avoid infinite wait
in merger & referee threads
                 Key: TEZ-4087
                 URL: https://issues.apache.org/jira/browse/TEZ-4087
             Project: Apache Tez
          Issue Type: Bug
            Reporter: Rajesh Balamohan


In certain cases, Shuffle's cleanupIgnoreErrors() is not called. This leaves 4 threads (inmem,
diskmerger, Referee, ShuffleAndMergeRunner) run forever.

When these are run in long running processes (e.g LLAP in Hive), they reach the thread limits
over time.

Note: Root cause why cleanupIgnoreErrors() is not invoked is not yet known. I will share the
details when i get more details on this. This ticket is created 
as a add-on safety so that thread leaks do not happen.

 



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