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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Update of "Hbase/HowToMigrate" by stack
Date Wed, 02 Feb 2011 20:03:24 GMT
Dear Wiki user,

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The "Hbase/HowToMigrate" page has been changed by stack.


  Migration is only supported between the file system version of the previous release and
the file system version of the current release. If the existing HBase installation has an
older file system version, it will be necessary to install a HBase release which can perform
the upgrade, run the migration tool and then install the desired release and run its migration
script. (Note that if the existing installation is several versions old, it may be necessary
to repeat this process).
  == Version-Specific Migration Notes ==
+ <<Anchor(090)>>
+ === From 0.20.x to 0.90.x (or to 0.89.x) ===
+ Nothing special is needed going between the two versions.  You should be able to just shutdown
your 0.20.x cluster, install 0.90.x (or 0.89.x), REMOVE conf/hbase-default.xml (its now inside
the hbase jar; and old 0.20.x hbase-default.xml actually has config damaging to hbase 0.90.x),
review hbase-site.xml so it only references config. that is in 0.90.x -- see [[http://hbase.apache.org/configuration.html#hbase_default_configurations|0.90.x
hbase-default.xml]] -- and restart.
+ You cannot go back once you've moved to 0.90.x/0.89.x.
  === From 0.19.x to 0.20.x ===

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