How to fix HBase 0.94.x not starting after downgrade

hbase_logo-470x140After downgrading my HBase installation from HBase 1.1.2 (currently stable at time of writing) to HBase 0.94.27, for purposes of compatibility with Gora I found myself unable to run HBase with multiple errors, after a couple of hours of debugging I found that the solution is to simply delete all the files in the hbase.rootdir which I specified in my hbase-site.xml

so, if your hbase-site.xml has the following properties

 

just cd to the previous directory and drop the hbase folder and recreated

after this, just start hbase with start-hbase.sh and eveything should be fine.

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