Hi Kiran , thanks for reply >From what I've read from online docs , downtime is inevitable for upgrading >from 0.90.2 to 0.94, and I can afford some downtime. I cannot afford dataloss, so I am concerning potential problems with rolling back to 0.90.2 if I fail to upgrade.
-- Best Regards Yusup Ashrap On Tuesday, February 26, 2013 at 3:53 PM, kiran wrote: > Hi, > > We also upgraded the version very recently. If you can afford couple of > minutes downtime then you can safely bring down the cluster and do upgrade. > As such, there will be no data loss, but be careful with splits. The > default split policy has been changed in this version if I am not wrong. It > causes some weird things. > > Thanks > Kiran > > > On Tue, Feb 26, 2013 at 1:03 PM, Yusup Ashrap <[email protected] > (mailto:[email protected])> wrote: > > > hi all, > > I am updating production cluster from 0.90.2 to 0.94 . My table's size is > > about 20TB+ . > > Scheduled update includes upgrading both hbase,hadoop version, > > and I am also changing user with which I start up both hadoop and hbase > > cluster from user "A" to user "B". > > > > It's production environment , so I wanted know what steps I should not > > miss regarding this upgrade. > > Table is kinda big and I don't have backup cluster to backup my data. > > I wanted to know will there be a data loss scenario if I rollback after > > having failed to upgrade. thanks. > > > > > > > > > > > > -- > > Best Regards > > Yusup Ashrap > > > > > > -- > Thank you > Kiran Sarvabhotla > > -----Even a correct decision is wrong when it is taken late
