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Posted to dev@apex.apache.org by "Vlad Rozov (JIRA)" <ji...@apache.org> on 2016/02/27 04:20:18 UTC

[jira] [Created] (APEXCORE-362) NPE in StreamingContainerManager

Vlad Rozov created APEXCORE-362:
-----------------------------------

             Summary: NPE in StreamingContainerManager
                 Key: APEXCORE-362
                 URL: https://issues.apache.org/jira/browse/APEXCORE-362
             Project: Apache Apex Core
          Issue Type: Bug
    Affects Versions: 3.3.0, 3.2.0, 3.2.1, 3.4.0, 3.3.1
            Reporter: Vlad Rozov
            Assignee: Vlad Rozov


There is a possible race condition while end window statistics is calculated by application master. While putIfAbsent() and get() are atomic and thread safe by itself, there is a possibility of thread switch in between, so that entry inserted by putIfAbasent will be removed and get may return null. 



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