I am starting this now.
> On Jan 15, 2015, at 11:34, Andrew Otto <[email protected]> wrote: > > Hi all, > > I’m in the middle of a (slow) upgrade process for the Hadoop cluster. > Currently, we are running CDH 5.0.2, and would like to upgrade to CDH 5.3. > There are several steps to this process, the first of which is upgrading our > OS to Ubuntu Trusty. > > Along the way, I’m replacing our current NameNodes with different hardware. > I am ready to do this now. I don’t see much opportunity to schedule this > over the next couple of weeks, due to All-Hands travel, so I’d like to > schedule this for tomorrow morning (Friday January 16th). > > I expect this to be relatively simple downtime, that will only take a few > minutes. Just in case, I’d like to reserve 2 hours of time. > > So, unless there are serious objections, plan for Hadoop to be offline from > > 2015-01-16 15:45 - 17:45 UTC > > Also, please don’t start jobs before this time slot that you think will take > a long time. If there are running jobs, I either can’t shut down the > cluster, or I will have to kill the jobs. If I see running jobs, I’ll try to > reach out to you before I kill anything. > > If anyone is interested in a rough migration plan, it is here: > > https://wikitech.wikimedia.org/wiki/Analytics/Cluster/Hadoop/Administration#Migrating_to_new_HA_NameNodes > > <https://wikitech.wikimedia.org/wiki/Analytics/Cluster/Hadoop/Administration#Migrating_to_new_HA_NameNodes> > > Thanks all! > > -Ao > >
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