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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 02:58:20 GMT
Dear Wiki user,

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

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   * 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?  IMO, 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 HStoreKey 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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