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https://issues.apache.org/jira/browse/STORM-1632?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15212753#comment-15212753
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ASF GitHub Bot commented on STORM-1632:
---------------------------------------
Github user HeartSaVioR commented on the pull request:
https://github.com/apache/storm/pull/1217#issuecomment-201689685
@roshannaik
Command line options override existing configurations.
https://github.com/apache/storm/blob/master/storm-core/src/jvm/org/apache/storm/utils/Utils.java#L452
```
895 [main] INFO o.a.s.StormSubmitter - Submitting topology BasicTopology
in distributed mode with conf
{"topology.acker.executors":0,"storm.zookeeper.topology.auth.scheme":"digest","topology.workers":2,"topology.debug":false,"storm.zookeeper.topology.auth.payload":"-6295626850175862189:-8269401123970688630","topology.disruptor.batch.size":10000,"topology.eventlogger.executors":0,"topology.max.task.parallelism":1}
1118 [main] INFO o.a.s.StormSubmitter - Finished submitting topology:
BasicTopology
```
> Disable event logging by default
> --------------------------------
>
> Key: STORM-1632
> URL: https://issues.apache.org/jira/browse/STORM-1632
> Project: Apache Storm
> Issue Type: Bug
> Components: storm-core
> Reporter: Roshan Naik
> Assignee: Roshan Naik
> Priority: Blocker
> Attachments: BasicTopology.java
>
>
> EventLogging has performance penalty. For a simple speed of light topology
> with a single instances of a spout and a bolt, disabling event logging
> delivers a 7% to 9% perf improvement (with acker count =1)
> Event logging can be enabled when there is need to do debug, but turned off
> by default.
> **Update:** with acker=0 the observed impact was much higher... **25%**
> faster when event loggers = 0
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