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https://issues.apache.org/jira/browse/ZOOKEEPER-1390?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Benjamin Reed updated ZOOKEEPER-1390:
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Attachment: ZOOKEEPER-1390.patch
this fixes the performance issue. i found that the improvement is anywhere from
5% (with 100% reads) to almost 100% (with 100% writes and 3 servers)
no tests since this is not a bug fix and does not add functionality.
> some expensive debug code not protected by a check for debug
> ------------------------------------------------------------
>
> Key: ZOOKEEPER-1390
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1390
> Project: ZooKeeper
> Issue Type: Improvement
> Components: server
> Reporter: Benjamin Reed
> Fix For: 3.5.0
>
> Attachments: ZOOKEEPER-1390.patch
>
>
> there is some expensive debug code in DataTree.processTxn() that formats
> transactions for debugging that are very expensive but are only used when
> errors happen and when debugging is turned on.
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