[jira] [Created] (HADOOP-12748) Uncaught exceptions are not caught/logged when ExecutorService is used

["Sidharta Seethana (JIRA)" <ji...@apache.org>]

Sidharta Seethana created HADOOP-12748:
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             Summary: Uncaught exceptions are not caught/logged when ExecutorService is used
                 Key: HADOOP-12748
                 URL: https://issues.apache.org/jira/browse/HADOOP-12748
             Project: Hadoop Common
          Issue Type: Bug
            Reporter: Sidharta Seethana
            Assignee: Sidharta Seethana


{{ThreadPoolExecutor}} catches (otherwise uncaught) exceptions/errors thrown by the tasks running in the corresponding thread pool. These are passed to an {{afterExecute}} method which seems to do nothing by default unless overridden.  Even though we register {{UncaughtExceptionHandler}}s in various places (e.g {{YarnUncaughtExceptionHandler}}), these handlers are not invoked because the uncaught exceptions/errors are not propagated all the way. 

To fix this, one mechanism would be to override {{ThreadPoolExecutor}} with an {{afterExecute}} method that would log these exceptions/errors. Logging these exceptions/errors would be useful in debug issues that are otherwise difficult to trace (e.g YARN-4643) because there is nothing in the logs indicating an uncaught exception/error 




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