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From "Karl Wright (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DERBY-6011) Derby performs very badly (seems to deadlock and timeout) in very simple multi-threaded tests
Date Sat, 08 Dec 2012 11:15:20 GMT
Karl Wright created DERBY-6011:

             Summary: Derby performs very badly (seems to deadlock and timeout) in very simple
multi-threaded tests
                 Key: DERBY-6011
                 URL: https://issues.apache.org/jira/browse/DERBY-6011
             Project: Derby
          Issue Type: Bug
    Affects Versions:,,
         Environment: Lenovo laptop with SSD's, Windows 7, 64-bit, Sun JDK 1.6.xx
            Reporter: Karl Wright

The Apache ManifoldCF project supports Derby as one of its underlying databases.  Simple tests,
however, demonstrate that Derby is apparently deadlocking and timing out repeatedly under
multi-thread conditions.  This problem is long-standing, and is not exhibited by any other
database ManifoldCF supports, and makes a simple test take between 6x and 12x as long.

There is a trivial test with demonstrates the problem vs. other databases.  Please do the
following (once you have java 1.6+, svn 1.7+, and ant 1.7+ available):

(1) Check out https://svn.apache.org/repos/asf/manifoldcf/trunk
(2) Run the following ant target to download the dependencies: "ant make-core-deps"
(3) Run the Derby test: "ant run-rss-tests-derby" . Note the time required - at least 180
seconds, can be up to 360 seconds.
(4) Run the equivalent HSQLDB test: "ant run-rss-tests-HSQLDB".  This test takes about 31
seconds to run.

The output of the Derby test can be found in the directory "tests/rss/test-derby-output".
 Have a look at manifoldcf.log, where all long-running queries are reported.  Derby.log is
also included, which shows only that during the test's cleanup phase the database is deleted
before it is shutdown, which is not pertinent to the performance issue.

I am available to assist with ManifoldCF, if that seems to be required.

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