[jira] [Created] (SPARK-18842) De-duplicate paths in classpaths in processes for local-cluster mode to work around the length limitation on Windows

["Hyukjin Kwon (JIRA)" <ji...@apache.org>]

Hyukjin Kwon created SPARK-18842:
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             Summary: 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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