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https://issues.apache.org/jira/browse/ZOOKEEPER-2549?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15489075#comment-15489075
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Michael Han commented on ZOOKEEPER-2549:
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bq. Sorry, which class are you referring to for debug ?
NIOServerCnxn.java (L720-727). But since you mentioned, I checked again and it 
looks like the change is copied from NettyServerCnxn which uses the pattern 
{{if (LOG.isDebugEnabled())}}. So I think we either change both by using 
{{LOG.debug}} directly and removing {{if (LOG.isDebugEnabled())}} , or leave 
both with current form. 

> As NettyServerCnxn.sendResponse() allows all the exception to bubble up it 
> can stop main ZK requests processing thread
> ----------------------------------------------------------------------------------------------------------------------
>
>                 Key: ZOOKEEPER-2549
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2549
>             Project: ZooKeeper
>          Issue Type: Bug
>          Components: server
>    Affects Versions: 3.5.1
>            Reporter: Yuliya Feldman
>            Assignee: Yuliya Feldman
>         Attachments: ZOOKEEPER-2549.patch, ZOOKEEPER-2549.patch, 
> zookeeper-2549-1.patch
>
>
> As NettyServerCnxn.sendResponse() allows all the exception to bubble up it 
> can stop main ZK requests processing thread and make Zookeeper server look 
> like it is hanging, while it just can not process any request anymore.
> Idea is to catch all the exceptions in NettyServerCnxn.sendResponse() , 
> convert them to IOException and allow it propagating up



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