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The "Hbase/HowToMigrate" page has been changed by stack. http://wiki.apache.org/hadoop/Hbase/HowToMigrate?action=diff&rev1=40&rev2=41 -------------------------------------------------- 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 ===
