[jira] Updated: (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:all-tabpanel ]

Michael Xu updated ZOOKEEPER-829:
---------------------------------

    Attachment: zookeeper-829.diff

hi everyone,

here is a patch for this issue. 

the server creates zknodes at /zookeeper/sessions with the sessionID as the name (NOT hex-encoded, uses base-10 representation of the sessionID ).

Any client writing anything to a session node causes the session to be expired. 

I will write unit tests when I get a chance, but I'd like feedback on design-wise what may need to be changed in order to include it officially. 

Likely, the next step will be making a test mode specifically for zookeeperserver so clients can use this functionality of managing sessions themselves.

michael

> 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
>         Attachments: zookeeper-829.diff
>
>
> 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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