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From "John H. Embretsen (JIRA)" <derby-...@db.apache.org>
Subject [jira] Created: (DERBY-1872) Backport lang/wisconsin.java at 10.2.0.4-alpha to the 10.1 branch
Date Wed, 20 Sep 2006 19:26:22 GMT
Backport lang/wisconsin.java at 10.2.0.4-alpha to the 10.1 branch
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                 Key: DERBY-1872
                 URL: http://issues.apache.org/jira/browse/DERBY-1872
             Project: Derby
          Issue Type: Test
          Components: Test
    Affects Versions: 10.1.3.1
         Environment: N/A
            Reporter: John H. Embretsen
         Assigned To: John H. Embretsen
            Priority: Minor
             Fix For: 10.1.3.2


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 10.2.0.4 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 10.2.0.4-snapshot (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 10.2.0.4, but to avoid
various dependencies (e.g. DERBY-1609), these should not be backported.




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