Ahh, mistake, I just took it as seconds. Now I wonder whether it can really do that fast ?? wont it take atleast 2ms for disk read? ( I have given 8G heapspace for RegionServer, is it caching so much?). Has anyone seen these kind of numbers ?
Actually, my initial problem was that I have a jetty infront of this hbase to serve this 4k value and when bench marked, it took 200+milliseconds for each record with 100 clients. That is why decided to benchmark without jetty first. Thanks, Murali Krishna ________________________________ From: Jean-Daniel Cryans <[email protected]> To: [email protected] Sent: Tuesday, 18 August, 2009 9:13:40 PM Subject: Re: HBase-0.20.0 randomRead Murali, I'm not reading the same thing as you. client-0 Finished randomRead in 2867ms at offset 0 for 10000 rows That means 2867 / 10000 = 0.2867ms per row. It's kinda fast. J-D On Tue, Aug 18, 2009 at 11:35 AM, Murali Krishna. P<[email protected]> wrote: > Hi all, > (Saw a related thread on performance, but starting a different one because > my setup is slightly different). > > I have an one node setup with hbase-0..20(alpha). It has around 11million > rows with ~250 regions. Each row with ~20 bytes sized key and ~4k sized value. > Since my primary concern is randomRead, modified the performanceEvaluation > code to read from this particular table. The randomRead test gave following > result. > > 09/08/18 08:20:41 INFO hbase.PerformanceEvaluation: client-1 Finished > randomRead in 2813ms at offset 10000 for 10000 rows > 09/08/18 08:20:41 INFO hbase.PerformanceEvaluation: Finished 1 in 2813ms > writing 10000 rows > 09/08/18 08:20:41 INFO hbase.PerformanceEvaluation: client-0 Finished > randomRead in 2867ms at offset 0 for 10000 rows > 09/08/18 08:20:41 INFO hbase.PerformanceEvaluation: Finished 0 in 2867ms > writing 10000 rows > > > So, looks like it is taking around 280ms per record. Looking at the latest > hbase performance claims, I was expecting it below 10ms. Am I doing > something basically wrong, since such a hiuge difference :( ? Please help me > fix the latency. > > The machine config is: > Processors: 2 x Xeon L5420 2.50GHz (8 cores) > Memory: 13.7GB > 12 Disks of 1TB each. > > Let me know if you need anymore details > > Thanks, > Murali Krishna
