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

Switch to Threaded View
HBase >> mail # user >> HBase random read performance

Copy link to this message
Re: HBase random read performance
Wouldn't do that... Changing block size is the last thing you want to do.

First question...

What is your key?

What is your record size that you are attempting to read.
Compare the 10k multiget versus 10k individual gets.

Fourth are your random keys sorted?
If not, try sorting them...

There are a lot of issues that can affect performance ....

Sent from a remote device. Please excuse any typos...

Mike Segel

On Apr 15, 2013, at 3:17 AM, Anoop Sam John <[EMAIL PROTECTED]> wrote:

> Ankit
>                 I guess you might be having default HFile block size which is 64KB.
> For random gets a lower value will be better. Try will some thing like 8KB and check the latency?
> Ya ofcourse blooms can help (if major compaction was not done at the time of testing)
> -Anoop-
> ________________________________________
> From: Ankit Jain [[EMAIL PROTECTED]]
> Sent: Saturday, April 13, 2013 11:01 AM
> Subject: HBase random read performance
> Hi All,
> We are using HBase 0.94.5 and Hadoop 1.0.4.
> We have HBase cluster of 5 nodes(5 regionservers and 1 master node). Each
> regionserver has 8 GB RAM.
> We have loaded 25 millions records in HBase table, regions are pre-split
> into 16 regions and all the regions are equally loaded.
> We are getting very low random read performance while performing multi get
> from HBase.
> We are passing random 10000 row-keys as input, while HBase is taking around
> 17 secs to return 10000 records.
> Please suggest some tuning to increase HBase read performance.
> Thanks,
> Ankit Jain
> iLabs
> --
> Thanks,
> Ankit Jain