hadoop-common-commits mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Trivial Update of "Hbase/RollingRestart" by stack
Date Thu, 11 Feb 2010 06:03:26 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 stack.
The comment on this change is: Do master first.
http://wiki.apache.org/hadoop/Hbase/RollingRestart?action=diff&rev1=3&rev2=4

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

  
  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.
  
+ Do the master first (hbase-2190 requires it). You'll need to kill it.  If you do {{{./bin/hbase-daemon.sh
stop master}}}, it'll stop the whole cluster.   Make sure the master is not in the midst of
handling a regionserver crash splitting logs.  Otherwise, killing its should be safe.  Once
its dead, start it up again with: {{{$ ${HBASE_HOME}/bin/hbase-daemon.sh start master}}}.
+ 
  Per regionserver, first update the pertinent jar or configuration.  Next, run the following
to stop the server: {{{$ ${HBASE_HOME}/bin/hbase-daemon.sh stop regionserver}}}.  Wait until
the server comes to a complete stop.  Then  restart it by doing the following: {{{$ ${HBASE_HOME}/bin/hbase-daemon.sh
start regionserver}}}. 
- 
- For the master, you'll need to kill it.  If you do {{{./bin/hbase-daemon.sh stop master}}},
it'll stop the whole cluster.   Make sure the master is not in the midst of handling a regionserver
crash splitting logs.  Otherwise, killing its should be safe.  Once its dead, start it up
again with: {{{$ ${HBASE_HOME}/bin/hbase-daemon.sh start master}}}.
  
  The above currently will not work for minor upgrades where data migration may be required
or where RPC version numbers have changed.
  

Mime
View raw message