[jira] Commented: (ZOOKEEPER-829) Add /zookeeper/sessions/* to allow inspection/manipulation of client sessions

["Michael Xu (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-829?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12907255#action_12907255 ] 

Michael Xu commented on ZOOKEEPER-829:
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hi everyone,

i plan on taking this on my plate. 

patrick and i spoke over irc, there are issues with the current method of logging in and closing client id's for the purposes of explicitly expiring sessions. 

being able to have explicit control over sessions is a very desirable feature for those doing testing with zookeeper.

i'll put some code in SessionTracker.java, that adds to DataTree.java on session creation on the cluster leader to create a /zookeeper/sessions/<id> and set a watch on it. clients may write a "close" to a zknode, which the server will acknowledge by removing the session. 





> Add /zookeeper/sessions/* to allow inspection/manipulation of client sessions
> -----------------------------------------------------------------------------
>
>                 Key: ZOOKEEPER-829
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-829
>             Project: Zookeeper
>          Issue Type: New Feature
>          Components: server
>            Reporter: Todd Lipcon
>
> For some use cases in HBase (HBASE-1316 in particular) we'd like the ability to forcible expire someone else's ZK session. Patrick and I discussed on IRC and came up with an idea of creating nodes in /zookeeper/sessions/<session id> that can be read in order to get basic stats about a session, and written in order to manipulate one. The manipulation we need in HBase is the ability to write a command like "kill", but others might be useful as well.

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