How big are the rows and are you using:
http://hadoop.apache.org/hbase/docs/r0.20.3/api/org/apache/hadoop/hbase/client/Scan.html#setCaching(int)
thx
J-D
On Mon, Feb 8, 2010 at 2:43 PM, Boris Aleksandrovsky <balek...@gmail.com>wrote:
> Hi,
>
> I have noticed that the performance of the full table scan (table contains
> about 5M rows) is extremely slow in our case. We are running 0.20.2,
> r834515
> and it takes about 3 min / 5000 rows to scan the table.
>
> We have 3 region servers on 3 different machines with the following
> characteristics:
>
> server11265576122987requests=0, regions=124, usedHeap=1468, maxHeap=2983
> server21265576119422requests=4, regions=121, usedHeap=1482, maxHeap=2983
> server31265576119423requests=44, regions=117, usedHeap=1570, maxHeap=2983
> The "slow" table in question is configured as following:
>
> Table = {NAME => 'post', FAMILIES => [{NAME => 'ngrams', VERSIONS => '3',
> COMPRESSION => 'NONE', TTL => '2147483647', BLOCKSIZE => '65536', IN_MEMORY
> => 'false', BLOCKCACHE => 'true'}]}
>
> There is nothing suspicious in the log, as far as I can tell.
>
> Please let me know if you need more information about our installation
>
> --
> Thanks,
>
> Boris
>
