Github user arunmahadevan commented on a diff in the pull request:
https://github.com/apache/storm/pull/2118#discussion_r118845392
--- Diff:
storm-client/src/jvm/org/apache/storm/windowing/WaterMarkEventGenerator.java ---
@@ -45,17 +46,25 @@
private final Map<GlobalStreamId, Long> streamToTs;
private final ScheduledExecutorService executorService;
private final int interval;
+ private final AtomicLong lastWaterMarkTs;
--- End diff --
this could be a volatile instead of AtomicLong
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