Github user shivaram commented on the pull request:
https://github.com/apache/spark/pull/2871#issuecomment-60121971
Yeah the only performance regression is in reading this volatile boolean if
you call `.value` many times. But I think that should be low (and it should be
insignificant if you call `.value` once which is I guess the most common use
case).
@rxin - I'll try to see if `transient lazy val` works. We'll still need
some logic to handle the `val` differently in the driver where we have to read
`obj` instead of `readBroadcastBlocks`
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