[BEAM-5197] Guard access to test timer service by a lock #8504
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This fixes a NPE in UnboundedSourceWrapperTest#testValueEmission. The processing timer queue could be concurrently accessed. To prevent this from happening, we must acquire the checkpoint lock before advancing time.
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This fixes a NPE in UnboundedSourceWrapperTest#testValueEmission.
The processing timer queue could be concurrently accessed. To prevent this from
happening, we must acquire the checkpoint lock before advancing time.
Post-Commit Tests Status (on master branch)
Pre-Commit Tests Status (on master branch)
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