Hi Kristian,
Thanks for taking care of this while you are on leave. +1 to checking in
your patches. More inline...
On 1/26/11 12:11 PM, Kristian Waagan wrote:
Hello,
I plan to enable automatic calculation of index cardinality statistics
by committing DERBY-4938 and DERBY-4939 (I have broken up the code
from the latest DERBY-4771 patch, the patches are just not accessable
for me right now).
Before I do that, I want to ask is people think the regression tests
are stable enough.
I think that Dag has just checked in a fix for an instability in the
regression tests related to interrupt handling. So that instability
should go away and there should be less noise obscuring instabilities
introduced by your statistics work, if any.
Enabling the auto-calculation may cause intermittent failures, since
the work is carried out in a background thread. Tests that may
experience failures are tests asserting on statistics and locks, and
which also perform SQL queries using indexes ([1]). If you suspect the
feature has caused an error, the first thing to do is to grep for
"istat" in derby.log.
It would be helpful wrt debugging if there aren't many intermittent
failures popping up already.
I can hold off for a while longer, but I want the feature to be tested
of many different types of operating systems and hardware before 10.8.
Yes, please.
Thanks,
-Rick
Opinions?
Regards,
