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From "Bryan Pendleton (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-2845) Devguide tips on debugging deadlocks should be clearer
Date Tue, 17 Nov 2009 05:25:40 GMT

    [ https://issues.apache.org/jira/browse/DERBY-2845?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12778730#action_12778730
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Bryan Pendleton commented on DERBY-2845:
----------------------------------------

The LOCK_TABLE feature is also described at
http://db.apache.org/derby/docs/10.5/ref/rrefsyscsdiagtables.html
now, I believe. So we should be able to tie all this information together.

> Devguide tips on debugging deadlocks should be clearer
> ------------------------------------------------------
>
>                 Key: DERBY-2845
>                 URL: https://issues.apache.org/jira/browse/DERBY-2845
>             Project: Derby
>          Issue Type: Improvement
>          Components: Documentation
>    Affects Versions: 10.2.2.0
>            Reporter: John H. Embretsen
>            Assignee: Bryan Pendleton
>            Priority: Minor
>
> There is a section of the Derby Developer's guide entitled "Debugging Deadlocks", see
http://db.apache.org/derby/docs/dev/devguide/cdevconcepts50894.html.
> This section refers to an internal class in the Derby engine without giving more information
about this class, or how you can use it:
> "Derby provides a class to help you in this situation, org.apache.derby.diag.LockTable."
> At the very least, the manual should include a direct pointer (link) to the Javadoc for
that class, located at http://db.apache.org/derby/javadoc/engine/org/apache/derby/diag/LockTable.html.
> Ideally, some information should be provided, showing readers how to use this class for
debugging, and/or describing how the information in the Javadoc can be utilized. Some links,
hints and tips in this regard exist on the following wiki page: http://wiki.apache.org/db-derby/LockDebugging.
In essence, the LockTable Javadoc contains most of the hints needed to interpret a deadlock
error message or a dump of the lock table (see DERBY-2817 or the Derby wiki for examples).
> The same paragraph in the manual is rounded off with the sentence "For information, see
the Derby Server and Administration Guide.". It is not at all clear to the reader what kind
of information to look for in the Server and Administration Guide, if such relevant information
exists. This reference should either be more specific, or removed.

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