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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Trivial Update of "Hbase/Migration" by stack
Date Fri, 18 Jan 2008 03:05:23 GMT
Dear Wiki user,

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

------------------------------------------------------------------------------
   * Downtime must be minimal.
   * Migration script will do no damage if run when there is nothing to migrate
  
- == Dependencies ==
+ == Prerequisites/Dependencies ==
   * Hbase fast backup to be run before migration to protect against data loss
  
  == Issues ==
-  * Should hbase classes be versioned and know how to migrate themselves?  Seems like excessive
overhead especially for smaller classes HStoreKey and its like.  If not, how to go between
versions (How to float two versions of same class in same job?).
+  * Should hbase classes be versioned and know how to migrate themselves?  Seems like excessive
overhead especially for smaller classes H!StoreKey and its like.  If not, how to go between
versions (How to float two versions of same class in same job?).
    * Maybe overhead wouldn't be that bad.  See [http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Nightly/javadoc/org/apache/hadoop/io/VersionedWritable.html
VersionedWritable].  It uses single byte versioning.
  

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