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From Sreeram Venkatasubramanian <Sreera...@infosys.com>
Subject Re: Measuring read latency with multiple threads
Date Thu, 07 Jan 2016 14:15:57 GMT
Hi Ted,

 I used HBase 1.0.0. The reads were distributed across the regions. 

Thanks,
Sreeram



----- Original Message -----
From: Ted Yu [mailto:yuzhihong@gmail.com]
Sent: Thursday, January 07, 2016 07:35 PM
To: user@hbase.apache.org <user@hbase.apache.org>
Subject: Re: Measuring read latency with multiple threads

Were the reads performed by the 100 threads going to very few regions or many regions across
the cluster ?

Which hbase release did you test against ?

Thanks

> On Jan 7, 2016, at 4:21 AM, Sreeram <sreeram.v@gmail.com> wrote:
> 
> Hi,
> 
> I am trying to measure HBase read latency with concurrent users. I am
> doing this by starting multiple threads in a Java program and measuring the
> latency at a thread level.
> 
> I was expecting a minor increase in per-thread latency - but I am observing
> that it is much more.
> 
> For example, in non-threaded mode I got 10 ms for a read operation. On
> running with 100 threads, the whole work load complete in roughly 1 sec.
> And every thread takes close to 1 second for end to end execution (all
> threads seem to start and end at the same time).
> 
> I will appreciate any input that will help me understand this.
> 
> Thank you.
> 
> Sreeram
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