Depends. If a machine fails hard and HDFS 2.x is setup correctly I'd expect this to be the ZK timeout (180s by default in 0.94, but can be lowered) + a few minutes to rejigger things.
-- Lars ________________________________ From: Demai Ni <[email protected]> To: "[email protected]" <[email protected]>; lars hofhansl <[email protected]> Sent: Wednesday, March 19, 2014 9:16 AM Subject: Re: How much time HBase will take if one Region Server down. Lars, I didn't get the 15~20 min from the article. I played a bit with my clusters on 94 early last year, and got a ball-park number. Well, my cluster was using all the default hbase configuration at that time, so it definitely wasn't well tuned. So for HBase 94, what's a reasonable MTTR # from your experience? Thanks Demai On Tue, Mar 18, 2014 at 10:51 PM, lars hofhansl <[email protected]> wrote: Many of the improvement were made in HDFS, so benefit 0.94 equally. >Not sure where you read 15-20 minutes for 0.94 in that article. > >-- Lars > > > >________________________________ > From: Demai Ni <[email protected]> >To: "[email protected]" <[email protected]> >Sent: Tuesday, March 18, 2014 10:59 AM >Subject: Re: How much time HBase will take if one Region Server down. > > > >a good article to start with: >http://hortonworks.com/blog/introduction-to-hbase-mean-time-to-recover-mttr/ > >I would say 15~20 min for 94 or earlier; it can be reduced to a couple min >with HBase 96+ and Hadoop . > >Demai > > > >On Tue, Mar 18, 2014 at 10:55 AM, Upendra Yadav <[email protected]>wrote: > >> How much time HBase will take if one Region Server down and try to read >> Region that belong to this down Region Server. >> >> Means Is there service down for those all region that belongs to dead RS? >> >> How much time HMaster will take to assign those region to live RS? What is >> the dependencies that may increase region assignment in such situation. >> >> Thanks.... >>
