clmccart opened a new pull request, #29979:
URL: https://github.com/apache/beam/pull/29979
make getProcessingDistributionsForWorkId synchronized to avoid race
conditions with remove tracker
the race condition happens in getProcessingDistributionsForWorkId because we
check for the existence of the work id in the activeTrackersByWorkId map before
retrieving the value from the map. if another thread removes the tracker from
the map in-between us checking for its existence and actually grabbing the
object, we will get a null tracker that then throws a NullPointerException when
we try to access data on it.
Was able to repro this with a chaos test locally and confirmed that
synchronizing the getProcessingDistributionsForWorkId method solves the issue.
Decided to not commit the chaos test since it's a bit messy and deviates from
test patterns in this repo.
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