[GitHub] [arrow] westonpace commented on pull request #34392: GH-34391: [C++] Future as-of-join-node hangs on distant times

["westonpace (via GitHub)" <gi...@apache.org>]

westonpace commented on PR #34392:
URL: https://github.com/apache/arrow/pull/34392#issuecomment-1512675192

   I agree that order between sources is not guaranteed.  In other words, the first batch might be `Source1Batch1` or it might be `Source2Batch1` but it will not be `Source1Batch2`.
   
   Another potential source of contention / race conditions is the interplay between `InputReceived` and the process thread.  Normally `InputReceived` runs first and then the process thread runs afterwards.  However, if the process thread is currently processing, it might run at the same time as `InputReceived` and there could be potential race conditions on the state.  Though I'm pretty sure you're aware of this already :)


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