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From "Dag H. Wanvik (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-151) Thread termination -> XSDG after operation is 'complete'
Date Sat, 28 Nov 2009 04:46:20 GMT

    [ https://issues.apache.org/jira/browse/DERBY-151?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12783205#action_12783205
] 

Dag H. Wanvik commented on DERBY-151:
-------------------------------------

Picking this up again; I haven't received any more comments on this, and it seems a net improvement

to me even if it may not be a panacea. I intend to commit this soon, unless anybody has any
misgivings.


> Thread termination -> XSDG after operation is 'complete'
> --------------------------------------------------------
>
>                 Key: DERBY-151
>                 URL: https://issues.apache.org/jira/browse/DERBY-151
>             Project: Derby
>          Issue Type: Bug
>          Components: Store
>    Affects Versions: 10.0.2.1
>         Environment: Linux kernel 2.4.21-243-athlon (SuSE 9.0)
>            Reporter: Barnet Wagman
>            Assignee: Dag H. Wanvik
>         Attachments: d151.java, derby-151-a.diff, derby-151-a.stat, derby-151-b.diff,
derby-151-b.stat, derby.log, Derby151Test.java
>
>
> I've encountered what appears to be a bug related to threading. After an INSERT operation,
if the invoking thread terminates too quickly, Derby throws an XSDG.
> The bug is a bit difficult to isolate but it occurs consistently in the following situation
(with a particular database and an operation of a particular size):
> Derby is running in embedded mode with autocommit on.  
> The application performs an INPUT operation from a thread that is not the main thread.
 The INPUT is issued using a PreparedStatement.  The INPUT adds ~ 256 records of six fields
each. (Note that INSERTs of this size seem to work fine in other contexts.)
>  
> The preparedStatement.executeUpdate() seems to excute successfully; at least it returns
without throwing an exception. 
> The thread that invoked the INPUT operation then terminates (but NOT the application).
 The next INPUT operation then results in an
> "ERROR XSDG1: Page Page(7,Container(0, 1344)) could not be written to disk, please check
if disk is full."
> The disk is definitely not full.
> HOWEVER, if I put the calling thread to sleep for a second before it exits, the problem
does not occur.
> I'm not quite sure what to make of this.  I was under the impression that most of Derby's
activity occurs in the application's threads.  Could Derby be creating a child thread from
in the application thread, which dies when the parent thread terminates?
> Thanks

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