[jira] [Created] (TOREE-389) Scala interpreter hangs if Spark is referenced before it is bound

["Ryan Blue (JIRA)" <ji...@apache.org>]

Ryan Blue created TOREE-389:
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             Summary: Scala interpreter hangs if Spark is referenced before it is bound
                 Key: TOREE-389
                 URL: https://issues.apache.org/jira/browse/TOREE-389
             Project: TOREE
          Issue Type: Bug
            Reporter: Ryan Blue


Some users run cells in a notebook before the kernel is finished starting. The messages are queued and run after the KernelMessageRelay is enabled, but any messages that reference {{spark}} or bound variables cause IMain to throw an exception. That exception causes the interpreter to hang.

It seems odd that a missing variable reference causes IMain to throw an exception, so there may be a threading issue, a race between binding {{spark}} and the cell that references it.

The problem can be avoided by moving {{postInit}} tasks into init.



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