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From Stack <st...@duboce.net>
Subject Re: potential enhancement to rolling restart
Date Thu, 08 Mar 2012 23:03:37 GMT
On Thu, Mar 8, 2012 at 1:36 PM, Ted Yu <yuzhihong@gmail.com> wrote:
> Currently Master has no knowledge about the order in which the region
> servers would be restarted.
> Consider this scenario: region R was hosted on RS n.
> When RS n gets restarted, master assigns R to RS n+1. However, RS n+1 may
> not have enough time to complete the transition before it is its turn to
> restart.
>

You've seen this stuff? http://hbase.apache.org/book.html#decommission

After restart, you can move the regions back before moving to the next RS.

Or, look at Aravind's work where he'll do a few servers at a time
orchestrating it all from scripts on the outside:
http://inchoate-clatter.blogspot.com/2012/03/hbase-ops-automation.html

St.Ack

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