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From "Bryan Pendleton (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-4856) Add thread dump information when derby crash
Date Wed, 17 Nov 2010 14:50:15 GMT

    [ https://issues.apache.org/jira/browse/DERBY-4856?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12932967#action_12932967
] 

Bryan Pendleton commented on DERBY-4856:
----------------------------------------

+1 to placing this information in a file of some sort.

derby.log is a reasonable suggestion.

Another idea is create a separate file JUST for this this crash information.
Since it's similar in notion to a "crash dump" file, how about a uniquely
generated name for a standalone "dump" file of some sort, as in:

    derby_minidump_YYMMDD_n.txt

Where the YYMMDD is today's date, and the 'N' is
a number incremented each time we produce a dump on
that date.

A nicely packaged standalone dump file produced on a system crash
would provide a very helpful tool for users to interact with the
community when trying to diagnose Derby problems.

> 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
>            Priority: Minor
>         Attachments: corruptdb.zip, derby-4856-1a.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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