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From "Kathey Marsden (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-4050) Multithreaded clob update causes growth in table that does not get reclaimed
Date Mon, 09 Feb 2009 13:36:59 GMT

    [ https://issues.apache.org/jira/browse/DERBY-4050?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12671850#action_12671850
] 

Kathey Marsden commented on DERBY-4050:
---------------------------------------

Thanks Kristian for reviewing the patch.  Just to clarify, the new debug statements won't
cause a sane build with derby.debug.true=DaemonTrace set to fail.  It will just cause additional
debug statements to print to the derby.log.  After this issue is closed I'll file another
issue to investigate and fix space reclamation for the other two cases where we give up after
3 tries.




> Multithreaded clob update causes growth in table that does not get reclaimed
> ----------------------------------------------------------------------------
>
>                 Key: DERBY-4050
>                 URL: https://issues.apache.org/jira/browse/DERBY-4050
>             Project: Derby
>          Issue Type: Bug
>          Components: Store
>    Affects Versions: 10.2.2.0, 10.3.3.0, 10.4.2.0, 10.5.0.0
>            Reporter: Kathey Marsden
>            Assignee: Kathey Marsden
>         Attachments: ClobGrowth.java, derby-4050_diff.txt, derby-4050_more_debug.diff,
derby.log.growth, derby.log.nogrowth
>
>
> Doing a multithreaded update of a Clob table causes table growth that does not get reclaimed
except by compressing the table.  The reproduction has a table with two threads. One  thread
 updates row 1 repeatedly with 33,000 character clob. The other thread updates row 2 with
a small clob, "hello".  The problem occurs back to 10.2 but seems much worse on trunk than
10.2.   The trunk database grew to 273MB on trunk after 10000 updates of each row. The 10.2
database grew only to 25MB.  If the update is synchronized there is no growth.
> I will attach the repro.

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