Home | About | Sematext search-lucene.com search-hadoop.com
 Search Hadoop and all its subprojects:

Switch to Threaded View
HBase >> mail # user >> Merge large number of regions

Copy link to this message
Re: Merge large number of regions

 I think a better approach would be a pre-split table and then do the
export/import.  This will save you from having to script the merges, which
can be end badly for META if done wrong.

On Mon, Oct 15, 2012 at 5:31 PM, Shrijeet Paliwal

> We moved to 0.92.2 some time ago and with that, increased the max file size
> setting to 4GB (from 2GB). Also an application triggered cleanup operation
> deleted lots of unwanted rows.
> These two combined have gotten us to a state where lots of regions are
> smaller than desired size.
> Merging regions two at a time seems time consuming and will be hard to
> automate. https://issues.apache.org/jira/browse/HBASE-1621 automates
> merging, but it is not stable.
> I am interested in knowing about other possible approaches folks have
> tried. What do you guys think about copyTable based approach ? (old
> ---copyTable---> new and then rename new to old)
> -Shrijeet

Kevin O'Dell
Customer Operations Engineer, Cloudera