Github user chinmaykolhatkar commented on a diff in the pull request:
https://github.com/apache/incubator-apex-core/pull/187#discussion_r48694586
--- Diff: engine/src/main/java/com/datatorrent/stram/engine/Node.java ---
@@ -485,6 +485,10 @@ protected void deactivateSinks()
void checkpoint(long windowId)
{
+ if (operator instanceof Operator.CheckpointNotificationListener) {
+
((Operator.CheckpointNotificationListener)operator).beforeCheckpoint(windowId);
--- End diff --
Should this be caught for Throwable?
In case the beforeCheckpoint throws exception, the states which are meant
to be saved won't be.
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