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From "Rick Hillegas (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-5131) Disable the istat daemon by default for 10.8.1
Date Mon, 14 Mar 2011 15:15:29 GMT

     [ https://issues.apache.org/jira/browse/DERBY-5131?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Rick Hillegas updated DERBY-5131:
---------------------------------

    Attachment: derby-5131-01-aa-disableIn10.8.1.diff

Attaching derby-5131-01-aa-disableIn10.8.1.diff. This patch turns off the istat daemon by
default and disables the istat tests. Regression tests ran cleanly for me. I verified by hand
that the istat tests now fail if you run them: the required statistics tuples no longer turn
up. Committed at subversion revision 1081416.

Touches the following files:

--------

M      java/engine/org/apache/derby/impl/sql/catalog/DataDictionaryImpl.java

Turns off the istat daemon by default.

--------

M      java/testing/org/apache/derbyTesting/functionTests/tests/store/_Suite.java

Disables the istat tests.


> Disable the istat daemon by default for 10.8.1
> ----------------------------------------------
>
>                 Key: DERBY-5131
>                 URL: https://issues.apache.org/jira/browse/DERBY-5131
>             Project: Derby
>          Issue Type: Task
>          Components: SQL, Test
>            Reporter: Rick Hillegas
>         Attachments: derby-5131-01-aa-disableIn10.8.1.diff
>
>
> Turning on the istat daemon increases the risk of problems which arise when a database
shuts down in the middle of collecting index statistics. There is concern that this increased
risk could be significant. A consensus has developed that the istat daemon should not run
by default in 10.8.1. For the shutdown-related problem, see DERBY-5108. For the community
discussion of the risk to 10.8.1, see this email thread: http://old.nabble.com/opinions-on-a-less-aggressive-release-of-the-istats-feature--to31129980.html#a31143697
> This issue tracks the work needed to turn off the istat daemon (by default) in 10.8.1
but re-enable it as the default on the trunk.

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