Github user srowen commented on the issue:
https://github.com/apache/spark/pull/13842
Well, it simplifies the code too and avoids a method call. The current
variable really ought to be volatile but isn't, so I don't know if that's a
downside. I think the performance issue is negligible, since the cost of
dereferencing a volatile variable is nothing compared to the time to construct
and log the message to disk. It's really minor but I think there are only
upsides here.
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