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https://issues.apache.org/jira/browse/STORM-1593?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15175647#comment-15175647
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Michael Schonfeld commented on STORM-1593:
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Yeah, that's exactly right. I want to know when all un-acked tuples have been 
acked, so that I can safely kill the topology.

Do you have any thoughts about the impl here? I was thinking of watching the 
queues population metrics...

> Nimbus indicator for when a Topology finished processing all tuples
> -------------------------------------------------------------------
>
>                 Key: STORM-1593
>                 URL: https://issues.apache.org/jira/browse/STORM-1593
>             Project: Apache Storm
>          Issue Type: New Feature
>          Components: storm-core
>            Reporter: Michael Schonfeld
>            Priority: Minor
>
> Every time we want to update topologies, we routinely find ourselves waiting 
> aimlessly for topologies to "fully finish" processing. We never truly know 
> when a topology is actually still processing tuples, and when it's really 
> done... Unless of course we wait for a full 10m window showing zeros in 
> Nimbus's topology stats table.
> I think it'd be beneficial to add some sort of a "Green" indicator in Nimbus, 
> showing when a deactivated topology has ~0 tuples ringing through it. Would 
> using the queue send/rcv population metric be correct for this?



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