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https://issues.apache.org/jira/browse/ZOOKEEPER-1390?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13206052#comment-13206052
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Benjamin Reed commented on ZOOKEEPER-1390:
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that's a good point camille. i thought it looked kind of ugly scattering all 
the if(...) around the code, but the debug messages, do look better than the 
rather raw looking messages you get from the toString() methods of the txnhdr 
and txn. i also don't have a strong opinion, so i'd like to leave as is, but if 
anyone feels strongly the other way, i'm fine spinning a new patch.
                
> 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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