[jira] Commented: (ZOOKEEPER-336) single bad client can cause server to stop accepting connections

["Henry Robinson (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-336?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12706550#action_12706550 ] 

Henry Robinson commented on ZOOKEEPER-336:
------------------------------------------

Just to update, I'm preparing a second patch which - while it doesn't change the functionality - improves some formatting issues as per comments on another patch plus adds a unit test. 

> single bad client can cause server to stop accepting connections
> ----------------------------------------------------------------
>
>                 Key: ZOOKEEPER-336
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-336
>             Project: Zookeeper
>          Issue Type: Improvement
>          Components: c client, java client, server
>            Reporter: Patrick Hunt
>            Priority: Critical
>             Fix For: 3.2.0
>
>         Attachments: ZOOKEEPER-336.patch
>
>
> One user saw a case where a single mis-programmed client was overloading the server with connections - the client was creating a huge number of sessions to the server. This caused all of the fds on the  server to become used.
> Seems like we should have some way of limiting (configurable override) the maximum number of sessions from a single client (say 10 by default?) Also we should output warnings when this limit is exceeded (or attempt to exceed).

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