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https://issues.apache.org/jira/browse/SYSTEMML-1131?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15706774#comment-15706774
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Felix Schüler commented on SYSTEMML-1131:
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It looks a little bit like this is an artifact from remote_mr.
The way that `checkMRAndRecompileToCP` and `releaseForcedRecompile` are used
looks like it was designed for MR. [~mboehm7], could you help me understand
what this does?
The NPE occurs in a script that uses parfor with remote_spark and inside it
calls a function that again uses parfor (without any parameters).
> NPE in executeRemoteSparkParFor
> -------------------------------
>
> Key: SYSTEMML-1131
> URL: https://issues.apache.org/jira/browse/SYSTEMML-1131
> Project: SystemML
> Issue Type: Bug
> Reporter: Felix Schüler
>
> The method ParForProgramBlock.releaseForcedRecompile(long tid) calls
> recompileProgramBlockHierarchy2Forced with execution type (et) null. This
> leads to a NullPointerException.
> I haven't fully figured out under which circumstances this occurs but it
> happens when calling an external function inside a forced parfor_spark.
> The ParForProgramBlock.executeRemoteSparkParFor method sets the flagForced to
> true which then in turn calls the above method with et==null.
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