[jira] [Created] (SAMZA-1220) Add thread name to SamzaContainer shutdown hook and prevent

["Prateek Maheshwari (JIRA)" <ji...@apache.org>]

Prateek Maheshwari created SAMZA-1220:
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             Summary: Add thread name to SamzaContainer shutdown hook and prevent 
                 Key: SAMZA-1220
                 URL: https://issues.apache.org/jira/browse/SAMZA-1220
             Project: Samza
          Issue Type: Bug
            Reporter: Prateek Maheshwari
             Fix For: 0.13.0


[~jagadish1989@gmail.com] and I were recently looking at a thread dump for a SamzaContainer that had deadlocked during the shutdown sequence. We noticed a couple of issues:

1. Adding a thread name to the shutdown hook thread will make debugging easier.
2. The shutdown hook thread's thread group is main's thread group. Main's default uncaught exception handler calls System.exit() in LocalContainerRunner. This leads to a deadlock if the shutdown hook throws an exception. We can either catch and ignore these exceptions or create a new thread group for it.



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