GitHub user ash211 opened a pull request:

    [SPARK-21563][CORE] Fix race condition when serializing TaskDescriptions 
and adding jars

    ## What changes were proposed in this pull request?
    Fix the race condition when serializing TaskDescriptions and adding jars by 
keeping the set of jars and files for a TaskSet constant across the lifetime of 
the TaskSet.  Otherwise TaskDescription serialization can produce an invalid 
serialization when new file/jars are added concurrently as the TaskDescription 
is serialized.
    ## How was this patch tested?
    Additional unit test ensures jars/files contained in the TaskDescription 
remain constant throughout the lifetime of the TaskSet.

You can merge this pull request into a Git repository by running:

    $ git pull SPARK-21563

Alternatively you can review and apply these changes as the patch at:

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #18913
commit e874fbeeff532c4351ba7318c750cd322c4a24f5
Author: Andrew Ash <>
Date:   2017-08-10T23:32:15Z

    Add test

commit b06425f7267e2f0e478000c30b60b963291aacb0
Author: Andrew Ash <>
Date:   2017-08-10T23:40:49Z

    Fix the test


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