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https://issues.apache.org/jira/browse/ZOOKEEPER-2856?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16101183#comment-16101183
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Michael Han commented on ZOOKEEPER-2856:
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[~panyuxuan] Thanks for the patch. It's a good improvement. 
Instead of uploading patch you can file a pull request instead. That is our 
recommended approach for new contribution. The benefit is you will get your 
github contribution credit when the patch is merged. Please refer 
https://cwiki.apache.org/confluence/display/ZOOKEEPER/HowToContribute for more 
details. For this case since the change is trivial I can commit your patch 
directly, it's up to you.

For the patch itself, can you use parameterized logging instead?

> ZooKeeperSaslClient#respondToServer should log exception message of 
> SaslException
> ---------------------------------------------------------------------------------
>
>                 Key: ZOOKEEPER-2856
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2856
>             Project: ZooKeeper
>          Issue Type: Improvement
>    Affects Versions: 3.4.10, 3.5.3
>            Reporter: Pan Yuxuan
>            Assignee: Pan Yuxuan
>            Priority: Minor
>         Attachments: ZOOKEEPER-2856-1.patch
>
>
> When upstream like HBase call ZooKeeperSaslClient with security enabled, we 
> sometimes get error in HBase logs like:
> {noformat}
> SASL authentication failed using login context 'Client'.
> {noformat}
> This error occures when getting SaslException in 
> ZooKeeperSaslClient#respondToServer :
> {noformat}
>  catch (SaslException e) {
>                 LOG.error("SASL authentication failed using login context '" +
>                         this.getLoginContext() + "'.");
>                 saslState = SaslState.FAILED;
>                 gotLastPacket = true;
>   }
> {noformat}
> This error makes user confused without explicit exception message. So I think 
> we can add exception message to the log.



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