Github user zsxwing commented on the pull request:
https://github.com/apache/spark/pull/5288#issuecomment-92579899
@JoshRosen, will this PR be merged? I'm using `localProperties` in #5473.
If we don't copy `localProperties`, `SparkListenerJobStart.properties` will
just point to `localProperties`. It will be used in `SparkListener`, which runs
in another thread. If `localProperties` is changed before a listener uses
`SparkListenerJobStart.properties`, the listener will see the modification
rather than the properties when Job starts.
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