Github user gauravgopi123 commented on a diff in the pull request:
https://github.com/apache/incubator-apex-core/pull/187#discussion_r49016695
--- 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 think this call should be made irrespective of whether the operator is
stateless or not. Here is the case I am thinking of, If I want to serialize the
operator state in my own way I should be able to do in call. I can mark all my
properties transient and use this call to serialize my state. I can do using
storage agent too but this could be easier and faster way..
Just a thought
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