Github user mxm commented on a diff in the pull request:
https://github.com/apache/flink/pull/2671#discussion_r84464275
--- Diff:
flink-streaming-java/src/main/java/org/apache/flink/streaming/api/windowing/triggers/ContinuousEventTimeTrigger.java
---
@@ -45,6 +45,12 @@
private final ReducingStateDescriptor<Long> stateDesc =
new ReducingStateDescriptor<>("fire-time", new Min(),
LongSerializer.INSTANCE);
+ /**
+ * Used to preserve the fire timestamp before merge such that
+ * the corresponding timer could be cleared after merge
+ */
+ private Long cachedFireTimestamp = null;
--- End diff --
This doesn't work because there is only one `Trigger` instance and this
will potentially be overwritten by many Windows being merged.
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