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From "Rick Hillegas (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-5671) NsTest does not run on trunk do multiple issues stemming from concurrency improvements
Date Mon, 26 Mar 2012 12:40:28 GMT

    [ https://issues.apache.org/jira/browse/DERBY-5671?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13238337#comment-13238337

Rick Hillegas commented on DERBY-5671:

Hi Kathey,

I am working on fixing the correctness problems with sequence generators. I should have a
candidate solution ready for review soon. After that, I will be ready to discuss what we should
do about identity columns. There are a number of issues in this area, linked to derby-5495,
and they need to be addressed before we release 10.9. That includes the sequence/identity
problems with nstest. Thanks.
> 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
> In 10.8 we coped with this problem by backing out the concurrency improvements (DERBY-5448)
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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