Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/2028#issuecomment-52588018
> The first synchronized is in the constructor which two threads cannot
call at the same time
Actually, I think two threads _could_ get into the constructor
simultaneously, but that it wouldn't be a problem because the calls would be
for different broadcast ids. ( `new TorrentBroadcast` is only called from
`TorrentBroadcastFactory.newBroadcast`, which is only called from
`BroadcastManager.newBroadcast`. This, in turn, is only called from
`SparkContext.broadcast`, which isn't synchronized.)
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