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Posted to issues@storm.apache.org by "Roshan Naik (JIRA)" <ji...@apache.org> on 2017/12/28 10:05:00 UTC

[jira] [Created] (STORM-2871) Performance optimizations for getOutgoingTasks

Roshan Naik created STORM-2871:
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             Summary: Performance optimizations for getOutgoingTasks 
                 Key: STORM-2871
                 URL: https://issues.apache.org/jira/browse/STORM-2871
             Project: Apache Storm
          Issue Type: Improvement
            Reporter: Roshan Naik


Task.getOutgoingTasks() is in critical messaging path. Two observed bottlenecks in it :

-[Looking up HashMap|] 'streamToGroupers'. Need to look into converting HashMap into Array lookup ?
- [outTasks.addAll(compTasks)|https://github.com/apache/storm/blob/master/storm-client/src/jvm/org/apache/storm/daemon/Task.java#L139]  seems to be impacting throughput as well. Identified by .. running ConstSpoutNullBoltTopo with 1 spout & bolt paralllelism (no Ack) and replacing this line with hard coded logic to add the single known bolt's taskID. 



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