column value at a time FYI
>
> -Anoop-
>
> From: Amit Sela [am...@infolinks.com]
> Sent: Saturday, September 15, 2012 2:41 PM
> To: user@hbase.apache.org
> Subject: Re: Optimizing table scans
>
> So just to get it straight. The reason the s
[am...@infolinks.com]
Sent: Saturday, September 15, 2012 2:41 PM
To: user@hbase.apache.org
Subject: Re: Optimizing table scans
So just to get it straight. The reason the scan with setBatch(1) is much
much faster is because it returns the only the value for the first column ?
On Wed, Sep 12, 2012 a
So just to get it straight. The reason the scan with setBatch(1) is much
much faster is because it returns the only the value for the first column ?
On Wed, Sep 12, 2012 at 5:37 PM, Doug Meil wrote:
>
> Hi there,
>
> See this for info on the block cache in the RegionServer..
>
> http://hbase.apac
Hi there,
See this for info on the block cache in the RegionServer..
http://hbase.apache.org/book.html
9.6.4. Block Cache
Š and see this for "batching" on the scan parameter...
http://hbase.apache.org/book.html#perf.reading
11.8.1. Scan Caching
On 9/12/12 9:55 AM, "Amit Sela" wrote:
>
I allocate 10GB per RegionServer.
An average row size is ~200 Bytes.
The network is 1GB.
It would be great if anyone could elaborate on the difference between Cache
and Batch parameters.
Thanks.
On Wed, Sep 12, 2012 at 4:04 PM, Michael Segel wrote:
> How much memory do you have?
> What's the si
How much memory do you have?
What's the size of the underlying row?
What does your network look like? 1GBe or 10GBe?
There's more to it, and I think that you'll find that YMMV on what is an
optimum scan size...
HTH
-Mike
On Sep 12, 2012, at 7:57 AM, Amit Sela wrote:
> Hi all,
>
> I'm tryi
Hi all,
I'm trying to find the sweet spot for the cache size and batch size Scan()
parameters.
I'm scanning one table using HTable.getScanner() and iterating over the
ResultScanner retrieved.
I did some testing and got the following results:
For scanning *100* rows.
*
Cache
Batch
Total
