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From "Eric Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8535) Test for zk leak does not account for unsynchronized access to zk watcher
Date Wed, 15 May 2013 20:41:18 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8535?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13658780#comment-13658780

Eric Yu commented on HBASE-8535:

[~saint.ack@gmail.com]Calling just close doesn't cause zk leak in previous version as hcm
would only wipe out the connection if it isn't allocated to any clients. Problem only happened
when the connection is wiped out while other clients are still using i.e. connection user
would start creating HTable, verify connection is open, closeStale caller would mark connection
as closed and shutdown zk, connection user thread would call getZKWatcher which would restart
zk). The overwhelming majority of cases our application calls close, but sometimes if app
thinks the connection is no longer usable, our app will call closeStale.

I don't think it is necessary to add to the api just for a test case. Ideally, client of connection
doesn't need to know anything about zk.

> Test for zk leak does not account for unsynchronized access to zk watcher
> -------------------------------------------------------------------------
>                 Key: HBASE-8535
>                 URL: https://issues.apache.org/jira/browse/HBASE-8535
>             Project: HBase
>          Issue Type: Test
>          Components: Client
>    Affects Versions: 0.98.0, 0.95.1
>            Reporter: Eric Yu
>            Assignee: stack
>             Fix For: 0.98.0, 0.95.1
>         Attachments: HBASE-8535.patch
> Test can detect a live zk connection in a closed hconnection because it does not accesses
the zk watcher in a synchronized manner. 

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