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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Trivial Update of "Hbase/HowToMigrate" by stack
Date Tue, 21 Jul 2009 22:11:07 GMT
Dear Wiki user,

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The following page has been changed by stack:
http://wiki.apache.org/hadoop/Hbase/HowToMigrate

------------------------------------------------------------------------------
  
  === From 0.19.x to 0.20.x ===
  
+ Please read the below carefully.
+ 
  You can only migrate to 0.20.x from 0.19.x.  If you have an earlier hbase, you will need
to install 0.19, migrate your old instance, and then install 0.20.x.
  
  Migration does not work for transactional hbase installs or for indexed hbase installs.
 Talk to us if you need this.
@@ -39, +41 @@

  
  ==== Preparing for Migration ====
  
- You to do a few things first before you can begin migration.
+ You must do a few things first before you can begin migration.
  
  ===== Can you back up your data? =====
  Migration has been tested but if you have sufficient space in hdfs to make a copy of your
hbase rootdir, do so.  Just in case.  Use hdfs distcp.
  
  ===== Major Compacting all Tables =====
- Before you begin, run a major compaction on all tables including .META. table.  To major
compact from the shell, hbase must be running.  For example, the below cluster has only one
table named 'a'.  See how we run a major_compaction on each:
+ Before you begin, you MUST run a major compaction on all tables including .META. table.
 Migration will not work without your completing major compaction.  To major compact from
the shell, hbase must be running.  For example, the below cluster has only one table named
'a'.  See how we run a major_compaction on each:
  
  {{{stack@connelly:~/checkouts/hbase/branches/0.19$ ./bin/hbase shell
  HBase Shell; enter 'help<RETURN>' for list of supported commands.

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