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From "John H. Embretsen (JIRA)" <derby-...@db.apache.org>
Subject [jira] Closed: (DERBY-1872) Backport lang/wisconsin.java at to the 10.1 branch
Date Fri, 29 Sep 2006 07:33:51 GMT
     [ http://issues.apache.org/jira/browse/DERBY-1872?page=all ]

John H. Embretsen closed DERBY-1872.

Thank you for committing; I have verified that the changes made it into the branch, and that
the Tinderbox test of revision 450908 (including these changes) did not fail more than previous
revisions. This patch got rid of a couple of huge master files, which is always a good thing...

For details on how to set heap sizes when testing different Derby versions, see my comment
to DERBY-1568, http://issues.apache.org/jira/browse/DERBY-1568#action_12436469.

> Backport lang/wisconsin.java at to the 10.1 branch
> -----------------------------------------------------------------
>                 Key: DERBY-1872
>                 URL: http://issues.apache.org/jira/browse/DERBY-1872
>             Project: Derby
>          Issue Type: Test
>          Components: Test
>    Affects Versions:
>         Environment: N/A
>            Reporter: John H. Embretsen
>         Assigned To: John H. Embretsen
>            Priority: Minor
>             Fix For:
>         Attachments: port-wisconsin-from-, port-wisconsin-from-
> Investigations relating to DERBY-1564 ("wisconsin.java test failed in DerbyNet or DerbyNetClient
frameworks, VM for network server got OutOfMemoryError") revealed that comparing memory usage
for the lang/wisconsin.[java|sql] test in 10.1.x versus 10.2.x was like comparing apples and
oranges. After the 10.1 branch was created, several updates were made to the wisconsin test
in trunk that were not backported to 10.1, e.g:
> * giving the optimizer unlimited time to choose query plans
> * compressing the tables to avoid the instabilities reported in DERBY-937
> Backporting the test will make it less unfair to compare 10.1 vs. 10.2 (or trunk) test
results and memory usage, and it will make it easier to determine if failures (such as DERBY-1564)
are regressions or not. On the other hand, other differences between the branches that may
influence the test will remain, so this will not be a wonder cure.
> The failures seen in DERBY-1564 were mainly caused by bugs (DERBY-1091, DERBY-1614) in
the test harness, causing the wisconsin test for the snapshot to run with low memory
settings. These issues have been fixed.
> The most practical backporting approach will probably be to take the wisconsin test as
it was in the (SVN revision 423199), and port it to the current 10.1 branch.
Other changes have been made to the wisconsin test in trunk/10.2 after, but to avoid
various dependencies (e.g. DERBY-1609), these should not be backported.

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