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https://issues.apache.org/jira/browse/STORM-2705?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jungtaek Lim resolved STORM-2705.
---------------------------------
Resolution: Fixed
Assignee: Daniel Klessing
Fix Version/s: 1.0.5
1.1.2
1.2.0
2.0.0
Thanks [~sakanaou], I merged into master, 1.x, 1.1.x, 1.0.x branches.
> DRPCSpout sleeps twice when idle
> --------------------------------
>
> Key: STORM-2705
> URL: https://issues.apache.org/jira/browse/STORM-2705
> Project: Apache Storm
> Issue Type: Bug
> Components: storm-core
> Reporter: Daniel Klessing
> Assignee: Daniel Klessing
> Fix For: 2.0.0, 1.2.0, 1.1.2, 1.0.5
>
> Attachments: drpc_idle_overhead.png
>
> Time Spent: 50m
> Remaining Estimate: 0h
>
> Profiling our topology I noticed that the {{DRPCSpout}} actually sleeps twice
> if it has nothing to do. This is due to a {{Utils.sleep(1)}} call at the end
> of {{nextTuple()}} while the {{SleepSpoutWaitStrategy}} performs the default
> sleep if a spout did not emit any tuple.
> This causes - in my understanding - unnecessary context switches, especially
> with a high number of parallelism.
> Attached the corresponding YourKit screenshot.
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