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The following page has been changed by stack: http://wiki.apache.org/hadoop/Hbase/HowToMigrate ------------------------------------------------------------------------------ You cannot migrate unless all has been major compacted first. Major compaction is necessary because the way deletes work changed in 0.20 hbase. - -ROOT- and .META. flush frequently so could mess up your nice and tidy single-file per store major_compacted hbase layout. They won't flush if there have not been edits. So, make sure your cluster is not taking writes and hasn't been doing so for a good while before starting up the major compaction process. + -ROOT- and .META. flush frequently so could mess up your nice and tidy single-file per store major_compacted hbase layout. They won't flush if there have not been edits. So, make sure your cluster is not taking writes and hasn't been doing so for a good while before starting up the major compaction process. Getting your cluster to shutdown with one file only in -ROOT- and .META. may be a bit tough so to help, facility has been added to the HEAD of the 0.19 branch that will allow you major compact catalog regions in a shutdown hbase. This facility only works on the -ROOT- and .META. catalog tables, not on user space tables. For usage, type: - TODO: Command-line tool to major compact an offline cluster. + {{{./bin/hbase org.apache.hadoop.hbase.regionserver.HRegion}}} ==== Migrating ====
