what about put broadcast to offheap?

[吴晓菊]

Now all broadcast data are put on heap since the StorageLevel is hard-coded
to MEMORY_AND_DISK_SER in TorrentBroadcast.

So it's highly possible the broadcast data will goto oldgen and then may
have impact on full-gc.

So what about put broadcast to offheap?

Chrysan Wu
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