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https://issues.apache.org/jira/browse/STORM-171?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rick Kellogg updated STORM-171:
-------------------------------
Component/s: storm-core
> Add "progress" method to OutputCollector
> ----------------------------------------
>
> Key: STORM-171
> URL: https://issues.apache.org/jira/browse/STORM-171
> Project: Apache Storm
> Issue Type: New Feature
> Components: storm-core
> Reporter: James Xu
> Priority: Minor
>
> https://github.com/nathanmarz/storm/issues/168
> void progress(Tuple input)
> This would send a message back to the spout (through the acker) to increase
> the timeout for the roots of the tuple. Would be useful if the processing
> times of a tuple is highly variable. The timeout should reset to
> TOPOLOGY_MESSAGE_TIMEOUT plus the current time.
> -----------
> xumingming: what's the content of the tuple passed to the method progress?
> -----------
> nathanmarz: It would be the tuple that was passed to "execute". For example,
> in pseudocode:
> execute(Tuple input):
> while(...):
> // do some processing
> _collector.progress(input)
> _collector.ack(input)
> So the progress method would extend the timeout for the spout tuples at the
> root of "input"
> Just a note – a "progress" method could be a key to implementing MapReduce on
> top of Storm (along with more powerful grouping/scheduling capabilities and
> the ability to make use of local disk).
> -----------
> rohitprasad15: I wanted to take up this issue. I learnt Clojure and Storm a
> week back, but want to get deep into both.
> I can briefly describe my approach -
> 1. Modify task.clj. Implement ^void progress [this ^Tuple tuple] as part of
> output-collector. Send a message to the acker, in a way similar to how ack
> method does it.
> 2. Modify acker.clj. Change execute() of IBolt implementation. Need to add
> ACKER-PROGRESS-STREAM-ID, to distinguish that its a progress message, and
> then finally reset the timeout to maxTopologyMessageTimeout.
> Is this approach in the right direction?
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