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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Update of "Hbase/HowToMigrate" by izaakrubin
Date Tue, 15 Jul 2008 22:57:20 GMT
Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Hadoop Wiki" for change notification.

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

The comment on the change is:
Added more specifics about migrating from 0.1 to 0.2.

------------------------------------------------------------------------------
   * Shut down the old instance of HBase.
   * If necessary, upgrade the underlying version of Hadoop to the version required by the
new instance of HBase.  Refer to the [http://wiki.apache.org/hadoop/Hadoop%20Upgrade Hadoop
Upgrade] page.
   * Download and configure the new instance of HBase.  Make sure you configure the ''hbase.rootdir''
of the new instance to be the same as that from the old instance.
-  * From the new instance of HBase, perform the HBase migration.  Run ''%{HBASE_HOME}/bin/hbase
migrate'' for usage.  See the version-specific notes below for more specific information on
this process.
+  * From the new instance of HBase, perform the HBase migration.  Run {{{{$HBASE_HOME}/bin/hbase
migrate}}} for usage.  See the version-specific notes below for more specific information
on this process.
   * Start the new instance of HBase.
  
  If you would like to learn more about the HBase Migration design, see [http://wiki.apache.org/hadoop/Hbase/Migration
HBase Migration]
@@ -16, +16 @@

  
  === From 0.1.x to 0.2.x ===
  
- HBase 0.1 depends on Hadoop 0.16.  HBase 0.2 depends on Hadoop 0.17 so first you will need
to upgrade your version of Hadoop as part of this migration.
+ The following are step-by-step instructions for migrating from HBase 0.1 to 0.2.  This migration
requires an upgrade form Hadoop 0.16 to 0.17, although the [http://wiki.apache.org/hadoop/Hadoop%20Upgrade
Hadoop Upgrade Instructions] are slightly out-of-date (as of this writing, July 2008).  As
such, the below instructions also clarify the necessary steps for upgrading Hadoop.
  
- After the hadoop migration is complete, the actual migration command to be executed by the
new HBase 0.2 instance is:
+ Assume Hadoop 0.16 and HBase 0.1 are already running with data you wish migrate to HBase
0.2.
+  * Stop HBase 0.1.
+  * From the [http://wiki.apache.org/hadoop/Hadoop%20Upgrade Hadoop Upgrade Instructions],
perform steps 1-4 and 9-10 (and optionally 5-8, 11-12).
+  * Run {{{{$HADOOP_HOME}/bin/start-dfs.sh -upgrade}}}
+  * Perform Hadoop upgrade steps 16-19.
+  * Download and configure HBase 0.2.  Make sure ''hbase.rootdir'' is configured to be the
same as it was in HBase 0.1.
+  * Run {{{{$HBASE_HOME}/bin/hbase migrate update}}}
+  * Start HBase 0.2.
  
- {{{{$HBASE_HOME}/bin/hbase migrate update}}}
- 

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