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From "Karl Wright (JIRA)" <j...@apache.org>
Subject [jira] Created: (DERBY-5073) Derby deadlocks without recourse on simultaneous correlated subqueries
Date Sun, 27 Feb 2011 16:32:40 GMT
Derby deadlocks without recourse on simultaneous correlated subqueries
----------------------------------------------------------------------

                 Key: DERBY-5073
                 URL: https://issues.apache.org/jira/browse/DERBY-5073
             Project: Derby
          Issue Type: Bug
            Reporter: Karl Wright


When the following two queries are run against tables that contain the necessary fields, using
multiple threads, Derby deadlocks and none of the queries ever returns.  Derby apparently
detects no deadlock condition, either.

SELECT t0.* FROM jobqueue t0 WHERE EXISTS(SELECT 'x' FROM carrydown t1 WHERE t1.parentidhash
IN (?) AND t1.childidhash=t0.dochash AND t0.jobid=t1.jobid) AND t0.jobid=?
SELECT t0.* FROM jobqueue t0 WHERE EXISTS(SELECT 'x' FROM carrydown t1 WHERE t1.parentidhash
IN (?) AND t1.childidhash=t0.dochash AND t0.jobid=t1.jobid AND t1.newField=?) AND t0.jobid=?

This code comes from Apache ManifoldCF, and has occurred when there are five or more threads
trying to execute these two queries at the same time.  Originally we found this on 10.5.3.0.
 It was hoped that 10.7.1.1 would fix the problem, but it hasn't.



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