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

Switch to Plain View
HBase >> mail # user >> independent scans to same region processed serially

James Taylor 2013-02-09, 01:49
Copy link to this message
Re: independent scans to same region processed serially
Regards, James,
Hari Kumar, from Ericsson Labs, in Data && Knowledge blog talked about
these issues:

It would be nice to talk with him to convince him to share its knowledge
here in the list, or in the
next HBaseCon
On 02/08/2013 08:49 PM, James Taylor wrote:
> Wanted to check with folks and see if they've seen an issue around
> this before digging in deeper. I'm on 0.94.2. If I execute in parallel
> multiple scans to different parts of the same region, they appear to
> be processed serially. It's actually faster from the client side to
> execute a single serial scan than it is to execute multiple parallel
> scans to different segments of the region. I do have region observer
> coprocessors for the table I'm scanning, but my code is not doing any
> synchronization.
> Is there a known limitation in this area? Anyone else see anything
> similar?
>     James

Marcos Ortiz Valmaseda,
Product Manager && Data Scientist at UCI
Blog: http://marcosluis2186.posterous.com
Twitter: @marcosluis2186 <http://twitter.com/marcosluis2186>
lars hofhansl 2013-02-09, 02:51
James Taylor 2013-02-09, 05:52
lars hofhansl 2013-02-09, 17:02
James Taylor 2013-02-09, 17:28
lars hofhansl 2013-02-09, 19:04
James Taylor 2013-02-10, 08:30
ramkrishna vasudevan 2013-02-09, 10:48
lars hofhansl 2013-02-09, 16:49