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HBase, mail # user - Parallel scan in HBase


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Re: Parallel scan in HBase
Mohammad Tariq 2013-02-01, 16:40
Do you need to scan each n every row within that range?Or you need specific
rows based on some filter?

Warm Regards,
Tariq
https://mtariq.jux.com/
cloudfront.blogspot.com
On Fri, Feb 1, 2013 at 9:16 PM, lars hofhansl <[EMAIL PROTECTED]> wrote:

> The scan contract in HBase is that all rows are returned in order, so all
> regions have to be traversed in order as well.
> It would be nice to add some facility to HBase to performs the scanning in
> parallel.
>
>
>
> ________________________________
>  From: Farrokh Shahriari <[EMAIL PROTECTED]>
> To: [EMAIL PROTECTED]
> Sent: Friday, February 1, 2013 5:52 AM
> Subject: Parallel scan in HBase
>
> Hi there
> I have two question about scan in Hbase :
> 1) Does scan operation with specific filter run in parallel on different
> regionservers ?
> 2) I wanna know whether this code runs at client side for searching the
> retrieved results or not ?
>
>          for (Result result : scanner1) {
>                          for (KeyValue kv : result.raw()) {
>                          //
>                          // some coeds
>                          //
>                      }
>                }
>
>
> Farrokh Shahriari
>