[jira] [Created] (TEZ-4213) Bound appContext executor capacity using a configurable property

["Panagiotis Garefalakis (Jira)" <ji...@apache.org>]

Panagiotis Garefalakis created TEZ-4213:
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             Summary: Bound appContext executor capacity using a configurable property
                 Key: TEZ-4213
                 URL: https://issues.apache.org/jira/browse/TEZ-4213
             Project: Apache Tez
          Issue Type: Bug
            Reporter: Panagiotis Garefalakis
            Assignee: Panagiotis Garefalakis


After TEZ-4170 was merged, appContext executor pool is also used by the RootInputInitializerManager to speed up SplitGeneration.

However, this executor pool currently has not capacity limit https://github.com/apache/tez/blob/master/tez-dag/src/main/java/org/apache/tez/dag/app/DAGAppMaster.java#L624

When generating splits for larger inputs (thousands or more) this could result in 
{color:red}java.lang.OutOfMemoryError: unable to create new native thread{color}

(reproducible with a test case)

I propose to limit the capacity of this pool to a configurable value that can be for example the number of physical cores by default.



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