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

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

The comment on the change is:
Minor change; point at the doc on API differences

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  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.
  
+ The API in 0.2 is not backward-compatible with hbase 0.1 versions.  See [http://wiki.apache.org/hadoop/Hbase/Plan-0.2/APIChanges API Changes] for discussion of the main differences.
+ 
  == Other Migration-Related Concerns ==
  
  === Redo Logs ===