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Posted to common-commits@hadoop.apache.org by Apache Wiki <wi...@apache.org> on 2011/08/10 21:46:33 UTC

[Hadoop Wiki] Update of "Hbase/RollingRestart" by DougMeil

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The "Hbase/RollingRestart" page has been changed by DougMeil:
http://wiki.apache.org/hadoop/Hbase/RollingRestart?action=diff&rev1=3&rev2=4

Comment:
marking page as obsolete (replaced by hbase book)

+ This page is OBSOLETE.  Replaced by http://hbase.apache.org/book.html#decommission
+ 
  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.