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From "Kathey Marsden (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-4856) Add thread dump information when derby crash
Date Tue, 07 Dec 2010 20:11:10 GMT

    [ https://issues.apache.org/jira/browse/DERBY-4856?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12968935#action_12968935
] 

Kathey Marsden commented on DERBY-4856:
---------------------------------------

Thanks Lily for the patch.

For the new engine ExceptionUtil, I don't think  the field threadDump is needed or used. 
The reflection call should use the ThreadDump in engine, not the shared one. I think then
it will be fine for the engine ThreadDump class to keep the original name,  ThreadDump.


In ContextManager, there seem to be some javadoc formatting issues with the new getErrorCode
method, which might better be callse dgetErrorSeverity.  I would add a comment that errors
that are not Standard or SQLExcetions are not handled at this time.
]

> Add thread dump information when derby crash
> --------------------------------------------
>
>                 Key: DERBY-4856
>                 URL: https://issues.apache.org/jira/browse/DERBY-4856
>             Project: Derby
>          Issue Type: Bug
>          Components: Services
>            Reporter: Lily Wei
>            Assignee: Lily Wei
>            Priority: Minor
>             Fix For: 10.8.0.0
>
>         Attachments: ContextManager.java, corruptdb.zip, derby-4856-1a.diff, DERBY-4856-part_1_1a.diff,
DERBY-4856_part_2_2a.diff, derby.log
>
>
> On system crash or session ending error, Derby should dump as much information as possible.
Such as: forcing a javacore if possible or at least thread dump and system environment information.
This should only occur if a running session crashes not on boot error due to fail recovery
etc.
> The IBM jvm provides a way to programmatically dump a javacore. i.e. com.ibm.jvm.Dump.JavaDump()
And, the SUN jvm will force a thread dump using the Unsafe class and there may be a better
way. 

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