I think 0.20.0 is preferred because of new job scheduler(s) there.
Stability wise, 0.20 is expected to be as good as 0.19.2.
I don't know the schedule for 0.19.2.
Raghu.
David Ritch wrote:
Raghu,
Thank you for your prompt and informative response. Moving to anything that
ends in .0 is a bit scary - what are the reasons to go with 0.20.0 instead
of 0.19.2? Yahoo is jumping from 0.18.x directly to 0.20.0? Why is Yahoo
skipping the 0.19.x release?
Is the expectation that 0.19.2 will be released at the same time as 0.20.0?
Thanks,
David
On Wed, Mar 18, 2009 at 1:31 PM, Raghu Angadi <rang...@yahoo-inc.com> wrote:
Short is answer I am afraid is no.
As an alternative, I recommend upgrading to latest 0.19.x or 0.20.0 (to be
released in couple of days). 0.19.2 is certainly a lot better than 0.19.0.
Yahoo is rolling out 0.20.x if that helps your confidence.
Raghu.
David Ritch wrote:
There is an established procedure for upgrading from one release of Hadoop
to a newer release. Is there something similar to move back to an
lower-numered release?
Specifically, we have data in a cloud running Hadoop-19.0. Because of
stability issues, we are wondering whether we should move back to 18, but
we
don't want to lose our data. Is there a downward migration path?
Thanks,
David
