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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Update of "Hbase/HowToMigrate" by izaakrubin
Date Tue, 22 Jul 2008 18:30:39 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

------------------------------------------------------------------------------
  
  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).
+  * 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) on your instance of Hadoop 0.16.
-  * Run {{{{$HADOOP_HOME}/bin/start-dfs.sh -upgrade}}}
+  * Run {{{{$HADOOP_HOME_0.17}/bin/start-dfs.sh -upgrade}}}
-  * Perform Hadoop upgrade steps 16-19.
+  * Perform Hadoop upgrade steps 16-19 on your instance of Hadoop 0.17.
-  * Run {{{{$HADOOP_HOME}/bin/hadoop dfsadmin -finalizeUpgrade}}}
+  * Run {{{{$HADOOP_HOME_0.17}/bin/hadoop dfsadmin -finalizeUpgrade}}}
   * Download and configure HBase 0.2.  Make sure ''hbase.rootdir'' is configured to be the
same as it was in HBase 0.1.
-  * Run {{{{$HBASE_HOME}/bin/hbase migrate update}}}
+  * Run {{{{$HBASE_HOME_0.2}/bin/hbase migrate update}}}
   * Start HBase 0.2.
  
  As you will notice, the [http://wiki.apache.org/hadoop/Hadoop%20Upgrade Hadoop Upgrade Instructions]
(specifically steps 2-4, 16-18) ask you to generate several logs to compare and ensure that
the upgrade ran correctly.  I did notice some inconsistency in my logs between ''dfs-v-old-report-1.log''
and ''dfs-v-new-report-1.log''; specifically the ''Total effective bytes'' and ''Effective
replication multiplier'' fields did not match (in the new log, the values reported were zero
and infinity, respectively).  Additionally, ''dfs-v-new-report-1.log'' claimed that the update
was not finalized.  Running {{{{$HADOOP_HOME}/bin/hadoop dfsadmin -finalizeUpgrade}}} resolves
the second issue, finalizing the upgrade as expected.  I could not find a way to resolve the
inconsistencies with the ''Total effective bytes'' and ''Effective replication multiplier''
fields.  Nonetheless, I found no problems with the migration and the data appeared to be completely
intact.

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