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From "Kathey Marsden (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DERBY-5671) NsTest does not run on trunk do multiple issues stemming from concurrency improvements
Date Sun, 25 Mar 2012 18:53:27 GMT
NsTest does not run on trunk do multiple issues stemming from concurrency improvements 
---------------------------------------------------------------------------------------

                 Key: DERBY-5671
                 URL: https://issues.apache.org/jira/browse/DERBY-5671
             Project: Derby
          Issue Type: Bug
          Components: SQL
            Reporter: Kathey Marsden
            Priority: Critical


As I understand it at least since September 30 of last year, the system test NsTest has been
broken on trunk.   In  these six months the test has not been runnable, so we do not know
if  new issues have been introduced with sequence generators or most importantly with auto-increment
columns that are now based on them, which many, many applications rely upon.  Even if the
known  problems are fixed later in the 10.9 release cycle and new problems are exposed, we
won't be able to  go back to any point in time to discover when they might be released.

In 10.8 we coped with this problem by backing out the concurrency improvements (DERBY-4448)
pending fixes for DERBY-5422, DERBY-5454, DERBY-5430.   Currently none of those issues have
been assigned.  Since this has been going on now for six months, I think we urgently need
to stabiliize auto-increment columns and get this test running again on trunk.   I can see
three possible options.
    1) Someone with interest assign themselves to these issues and make significant progress
over the next few weeks.
    2)  Make the concurrency improvements optional  with a property which defaults to false
(I don't know if this is practical)
    3) Back the concurrency performance improvements out of trunk until these issues have
been resolved and the change can be resubmitted.

I realize that NsTest is not the easiest test to work with but it does seem to have found
serious problems with generated columns that I think users are likely to hit.  In the past,
a  similiar disregard for mailjdbc exposing a corruption issue meant that we actually released
a bad  corruption issue that I know hit many users of Derby before we addressed it.  Autoincrement
is widely, widely, used. We need to get it stabilized and the test running on trunk.   Although
the system tests are not particularly easy to deal with, they are all we have and they do
find issues.




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