lostluck opened a new pull request, #30119:
URL: https://github.com/apache/beam/pull/30119
Resolve a memory leak as a result of the Data Manager read cache not
evicting data streams for which it had not known it had seen all the data
streams.
See the new comment in the code for details.
We don't take the alternative approach of checking the DataChannel's
endedInstruction cache because it's possible that cache of instruction
references might have a gap, with more than the current cache cap of ended
instructions cycling through before the data channel is triggered to observe
it. Best to check the cache's contents directly.
Fixes #28142.
I'm not sure how to test for this unfortunately without significantly
changing the code, as it's a goroutine local cache, and adding additional
synchronization is undesirable.
While this regression has been in the SDK for a while (since around February
2023) I'd like to cherry pick it into the 2.54.0 release so the ever patient
user can finally upgrade to a newer SDK version.
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