Github user tweise commented on a diff in the pull request:
https://github.com/apache/incubator-apex-core/pull/187#discussion_r48981189
--- 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) {
--- End diff --
The call is to notify of the imminent checkpoint. If there is no
checkpoint, then why call the listener.
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