[jira] [Resolved] (IMPALA-13230) Add a way to dump stack traces for impala-shell while it is running

["Joe McDonnell (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IMPALA-13230?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Joe McDonnell resolved IMPALA-13230.
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    Fix Version/s: Impala 4.5.0
         Assignee: Joe McDonnell
       Resolution: Fixed

> Add a way to dump stack traces for impala-shell while it is running
> -------------------------------------------------------------------
>
>                 Key: IMPALA-13230
>                 URL: https://issues.apache.org/jira/browse/IMPALA-13230
>             Project: IMPALA
>          Issue Type: Task
>          Components: Clients
>    Affects Versions: Impala 4.5.0
>            Reporter: Joe McDonnell
>            Assignee: Joe McDonnell
>            Priority: Major
>             Fix For: Impala 4.5.0
>
>
> It can be useful to get the Python stack traces for impala-shell when it is stuck. There is a nice thread on Stack Overflow about how to do this: [https://stackoverflow.com/questions/132058/showing-the-stack-trace-from-a-running-python-application]
> One option is to install a signal handler for the SIGUSR1 signal and use that to dump a backtrace. I tried this and it works for Python 3 (but causes issues for running queries on Python 2):
> {noformat}
>     # For debugging, it is useful to handle the SIGUSR1 symbol and use it to print a
>     # stacktrace
>     signal.signal(signal.SIGUSR1, lambda sid, stack: traceback.print_stack(stack)){noformat}
> Another option mentioned is the faulthandler module ([https://docs.python.org/dev/library/faulthandler.html|https://docs.python.org/dev/library/faulthandler.html)] ), which provides a way to do the same thing. The faulthandler module seems to be able to do this for all threads, not just the main thread.
> Either way, this would give us some options if we need to debug impala-shell out in the wild.



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