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https://issues.apache.org/jira/browse/HADOOP-12748?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sidharta Seethana updated HADOOP-12748:
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Description:
{{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 debugging issues that are otherwise
difficult to trace (e.g YARN-4643) because there is nothing in the logs
indicating an uncaught exception/error
Edit: uploaded some test code that demonstrates this issue.
was:
{{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 debugging issues that are otherwise
difficult to trace (e.g YARN-4643) because there is nothing in the logs
indicating an uncaught exception/error
Edit: uploaded some test code that demonstrates this issue.
> 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
> Attachments: TestUncaughExceptionHandler.java
>
>
> {{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 debugging issues that are
> otherwise difficult to trace (e.g YARN-4643) because there is nothing in the
> logs indicating an uncaught exception/error
> Edit: uploaded some test code that demonstrates this issue.
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