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Posted to common-commits@hadoop.apache.org by Apache Wiki <wi...@apache.org> on 2009/11/07 01:34:54 UTC

[Hadoop Wiki] Update of "Hbase/HowToMigrate" by DaveLatham

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The "Hbase/HowToMigrate" page has been changed by DaveLatham.
http://wiki.apache.org/hadoop/Hbase/HowToMigrate?action=diff&rev1=39&rev2=40

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  This migration rewrites all data.  It will take a while.
  
- It will disable compression setting all column families to no compression.  Enable manually post-compression (Rare should be person who has compression enabled -- talk to us if this is a problem).
+ Compression settings have changed in 0.20.x.  By default, migration will disable compression setting all column families to no compression.  You can enable manually post-compression.  Beginning with HBase 0.20.2, you can set a "migrate.compression" property in hbase-site.xml to LZO or GZ to have all of your table migrated to that compression setting automatically. See [[http://wiki.apache.org/hadoop/UsingLzoCompression|Using Lzo Compression]] for instructions to add LZO support to your cluster.
  
  
  ==== Preparing for Migration ====