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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 18:31:17 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8535?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13658636#comment-13658636

Eric Yu commented on HBASE-8535:

testDeleteForZKConnLeak is using a hconnection to create a HTable while another thread is
calling deleteStaleConnection because previous if a hconnection gets closed at the wrong time
while it is being used by constructor of HTable, HTable constructor can restart zk connection
on a closed hconnection. I couldn't figure out how to reproduce the problem precisely so the
test just calls both a lot in two separate threads and hopes that if a leak exists, it will
happen during the test. However, when the conn gets closed while being used for HTable constructor,
there is an exception and a sleep and a retry three times (2s, 4s, 8s?) somewhere in the constructor
that makes the test quite slow. I will see if I can set connection property to not do this
> 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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