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From "Dyre Tjeldvoll (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-3198) Using setQueryTimeout will leak sections
Date Thu, 06 Dec 2007 13:25:43 GMT

    [ https://issues.apache.org/jira/browse/DERBY-3198?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12549027
] 

Dyre Tjeldvoll commented on DERBY-3198:
---------------------------------------

>From what I can tell, the call to Section.free() in Statement.initResetStatement() can
either come from a call to Statement's constructor, or from a chain of 13(!) method calls
originating from ClientPooledConnection.reset(). 

My interpretation of this is that by freeing Sections in initResetStatement() we ensure that
Statements belonging to unused Connections in a connection pool do not hold on to Section
objects. This sounds reasonable, so I think it is a good idea to free setSpecialRegisterSection_
in Statement.initResetStatement() as well.

> Using setQueryTimeout will leak sections 
> -----------------------------------------
>
>                 Key: DERBY-3198
>                 URL: https://issues.apache.org/jira/browse/DERBY-3198
>             Project: Derby
>          Issue Type: Bug
>          Components: JDBC, Network Client
>    Affects Versions: 10.3.1.4
>            Reporter: Dyre Tjeldvoll
>            Assignee: Dyre Tjeldvoll
>         Attachments: derby-3198.v1.diff, derby-3198.v2.diff, derby-3198.v3.diff, derby-3198.v4.diff,
derby-3198.v5.diff, repro.diff
>
>
> The implementation of setQueryTimeout relies on NetStatementReply.writeSetSpecialRegister()
which will allocate a dynamic section when called. No reference to this Section object is
kept, and so Section.free() never gets called on it. Executing the same statment repeatedly
with a query timeout set results in the client driver throwing an exception because the number
of Sections exceeding 32000.

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