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From "HBase Review Board (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-3095) Client needs to reconnect if it expires its zk session
Date Thu, 04 Nov 2010 19:36:42 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3095?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12928318#action_12928318
] 

HBase Review Board commented on HBASE-3095:
-------------------------------------------

Message from: "Jean-Daniel Cryans" <jdcryans@apache.org>


bq.  On 2010-11-04 12:30:24, stack wrote:
bq.  > /trunk/src/main/java/org/apache/hadoop/hbase/zookeeper/ZooKeeperWatcher.java, line
326
bq.  > <http://review.cloudera.org/r/1167/diff/1/?file=16666#file16666line326>
bq.  >
bq.  >     Why a new exception?  Why not pass the one that got us here? (Or, maybe there
isn't one? Or you can't get at it)

Yeah there's no exception leading us there, it's the ZK event. Will add more documentation
tho.


- Jean-Daniel


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> Client needs to reconnect if it expires its zk session
> ------------------------------------------------------
>
>                 Key: HBASE-3095
>                 URL: https://issues.apache.org/jira/browse/HBASE-3095
>             Project: HBase
>          Issue Type: Bug
>            Reporter: stack
>            Assignee: Jean-Daniel Cryans
>             Fix For: 0.90.0
>
>
> Clients use an HConnection down in their guts to connect to the hbase cluster.  Master-is-running
and root-region-location are up in zk.   Setup of a new HConnection sets up a connection to
ZooKeeper.  If the session with ZK expires for whatever reason -- in tests they would expire
because zk ensemble was restarted across tests or we might expire because of a long GC, well,
it'll be frustrating to users if we do not just try and resetup the zk connection.

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