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From stack <st...@duboce.net>
Subject Re: HBase Performance question
Date Tue, 22 Apr 2008 16:59:39 GMT
What Jim said and then....

For sure you are not creating a new HTable per request?  How many 
regions in your table?  Which version of HBase?  Why do you have Tomcat 
in the picture?  Because clients are doing HTTP?   The time for sure is 
being spent making the request out to HBase and not spent transforming 
HBase results in and out of HTTP?


Karthik Pattabiraman wrote:
> Hi,
>    I am evaluating HBase for a serving system. The requirements are 
> fairly simple. Each record comprises a key and a value (size ~4k).
>    I set up a small cluster consisting of two boxes and the number of 
> records inserted into the table is close to 65K.
>   Now I ran a tomcat server on one of the boxes (where the master is 
> running). The tomcat server establishes a connection to hbase at start 
> and then on each request queries the hbase for the record.
>    The benchmarks were not good. I ran the benchmarks for 30 min with 
> 20 clients (talking to tomcat) and the average response time was 51 
> ms. When I increased the number of clients to 50, the average response 
> time increased to 110 ms. To ensure that tomcat is not the bottleneck, 
> I logged the time taken for each Hbase request and found that to be 
> correlating the benchmarks (time increased when i increased the number 
> of clients.).
>    Any idea as to why this would happen given that the number of 
> records is not huge? (FYI: Both the boxes act as region servers, the 
> box where tomcat runs, also runs hbase master and the dfs namenode)
>    Could it be due to the way I have set up Hbase?
>    Any help would be appreciated.
> thanks
> karthik

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