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From Dave Latham <lat...@davelink.net>
Subject rollback to 0.20
Date Wed, 27 Apr 2011 18:08:42 GMT
The HBase book ( http://hbase.apache.org/book/upgrading.html ) states,

> This version of 0.90.x HBase can be started on data written by HBase 0.20.x or HBase
0.89.x. There is no
> need of a migration step. HBase 0.89.x and 0.90.x does write out the name of region directories
differently --
> it names them with a md5 hash of the region name rather than a jenkins hash -- so this
means that once
> started, there is no going back to HBase 0.20.x.

Does this mean that if we prevent region splits, that it would be
possible to rollback to HBase 0.20.6, or are there other data format
changes that would prevent that?


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