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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Trivial Update of "Hbase/RollingRestart" by JeanDanielCryans
Date Thu, 19 Nov 2009 21:51:14 GMT
Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Hadoop Wiki" for change notification.

The "Hbase/RollingRestart" page has been changed by JeanDanielCryans.
http://wiki.apache.org/hadoop/Hbase/RollingRestart?action=diff&rev1=2&rev2=3

--------------------------------------------------

- If you want to upgrade between point versions -- e.g. from 0.20.0 to 0.20.1 -- of HBase
or change configurations WITHOUT bringing down your whole cluster -- i.e. you want to keep
serving through the upgrade -- follow the below '''Rolling Restart''' receipe. This feature
is available in 0.20.0 HBase (Unreleased as of the writing of this page).
+ If you want to upgrade between point versions -- e.g. from 0.20.0 to 0.20.1 -- of HBase
or change configurations WITHOUT bringing down your whole cluster -- i.e. you want to keep
serving through the upgrade -- follow the below '''Rolling Restart''' receipe. This feature
is available in 0.20.0 HBase.
  
  In the below, you will take down one or more servers at a time, upgrade or change their
configuration, and then bring the servers back on line afterward.  Ideally, you'd do the upgrade
a server-at-a-time to minimize region churn but if your cluster large, you can upgrade a few
on each iteration. Just be sure that the number of servers you drop is not of a proportion
as to render your serving cluster a mortal blow.
  

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