Github user aarondav commented on the pull request:
https://github.com/apache/spark/pull/1603#issuecomment-50238872
Does the movement of the status modification into the synchronized block
change anything? It seems the only effective change here is downgrading an
exception to a log message.
Because we remove the status from the map within the synchronized block, it
would seem that it's safe to do our subsequent modification of the status
without (though it does seem to be more consistent with the rest of the code to
do it within).
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