Github user PramodSSImmaneni commented on a diff in the pull request:
https://github.com/apache/incubator-apex-core/pull/187#discussion_r49036338
--- 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 --
I see your point Thomas but as chinmay pointed out shouldn't both this and
checkpointed callback not be called for stateless. Gaurav if you use this call
in stateless operator to persist your operator state in your own way there is
no inverse callback from the platform to recover that state.
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