je-ik commented on a change in pull request #12155:
URL: https://github.com/apache/beam/pull/12155#discussion_r448578714
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File path:
runners/direct-java/src/main/java/org/apache/beam/runners/direct/QuiescenceDriver.java
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@@ -70,6 +71,8 @@ public static ExecutionDriver create(
private final Map<AppliedPTransform<?, ?, ?>,
ConcurrentLinkedQueue<CommittedBundle<?>>>
pendingRootBundles;
private final Queue<WorkUpdate> pendingWork = new ConcurrentLinkedQueue<>();
+ private final Map<AppliedPTransform<?, ?, ?>,
Collection<CommittedBundle<?>>> inflightBundles =
+ new ConcurrentHashMap<>();
Review comment:
We collect here bundles and AppliedPTransforms that have started to
process bundle, but have not completed it yet. The reason for that is that the
bundle processing might change output watermark of a PTransform before
enqueuing the resulting bundle to pendingUpdates of downstream PTransform,
which can lead to watermark being updated past the emitted elements.
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