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https://issues.apache.org/jira/browse/SPARK-18842?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15745350#comment-15745350
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Hyukjin Kwon commented on SPARK-18842:
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This completes the parent task and I can proceed far more.
> De-duplicate paths in classpaths in processes for local-cluster mode to work
> around the length limitation on Windows
> --------------------------------------------------------------------------------------------------------------------
>
> Key: SPARK-18842
> URL: https://issues.apache.org/jira/browse/SPARK-18842
> Project: Spark
> Issue Type: Sub-task
> Components: Spark Core, Tests
> Reporter: Hyukjin Kwon
> Priority: Minor
>
> Currently, some tests are being failed and hanging on Windows due to this
> problem. For the reason in SPARK-18718, some tests using {{local-cluster}}
> mode were disabled on Windows due to the length limitation by paths given to
> classpaths.
> The limitation seems roughly 32K (see
> https://blogs.msdn.microsoft.com/oldnewthing/20031210-00/?p=41553/ and
> https://support.thoughtworks.com/hc/en-us/articles/213248526-Getting-around-maximum-command-line-length-is-32767-characters-on-Windows)
> but executors were being launched with the command such as
> https://gist.github.com/HyukjinKwon/5bc81061c250d4af5a180869b59d42ea in
> (only) tests.
> This length is roughly 40K due to the class paths. However, it seems there
> are duplicates more than half. So, if we de-duplicate this paths, it is
> reduced to roughly 20K.
> Maybe, we should consider as some more paths are added in the future but it
> seems better than disabling all the tests for now with minimised changes.
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