Rafael Schloming wrote:
Robert Greig wrote:
Hi,
We were aiming to get the three critical M2 jiras done today, so I
thought I should ask what the status is - here were the earlier
summaries I had:
QPID-531 : Martin has a one line fix for this which will be committed
very soon
There haven't been any commits for this yet. Martin is this on track
for today? Did testing show up bugs?
QPID-572 : Believed to be fixed
There has been some further discussion about this following a commit
by Martin. Do we think we have a fix or is more work required?
This is a tricky issue. There are actually two bugs here. The correct
fix for QPID-572 (the original patch submitted to the JIRA) actually
causes another race condition to be more likely. I've described the
other race condition in detail in QPID-601.
The modified patch for QPID-572 simply circumvents the effect of the
correct fix when selectors are used. This makes QPID-601 less likely to
occur, but the basic race condition described in QPID-601 is still
there. Unfortunately this also reintroduces the ordering bug if
selectors are used, and also unfortunately, AFAICT a proper fix for
QPID-601 is non trivial.
So basically if we want to release M2 in a timely manner we need to
choose between selectors with correct message ordering and a higher
chance of messages being stranded, or selectors with incorrect message
ordering and a lower chance of messages being stranded.
Just to be clear, the message ordering problem should be fixed either
way if you don't use selectors.
--Rafael
