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From Jack Levin <magn...@gmail.com>
Subject Re: Speeding up HBase read response
Date Fri, 06 Apr 2012 17:14:27 GMT
Please email iostat -xdm 1, run for one minute during load on each node
Sent from my Android phone with K-9 Mail. Please excuse my brevity.

ijanitran <tazija@yahoo.com> wrote:

I have 4 nodes HBase v0.90.4-cdh3u3 cluster deployed on Amazon XLarge
instances (16Gb RAM, 4 cores CPU) with 8Gb heap -Xmx allocated for HRegion
servers, 2Gb for datanodes. HMaster\ZK\Namenode is on the separate XLarge
instance. Target dataset is 100 millions records (each record is 10 fields
by 100 bytes). Benchmarking performed concurrently from parallel 100

I'm confused with a read latency I got, comparing to what YCSB team achieved
and showed in their YCSB paper. They achieved throughput of up to 7000
ops/sec with a latency of 15 ms (page 10, read latency chart). I can't get
throughput higher than 2000 ops/sec on 90% reads/10% writes workload. Writes
are really fast with auto commit disabled (response within a few ms), while
read latency doesn't go lower than 70 ms in average.

These are some HBase settings I used:


Which settings do you recommend to look at\tune to speed up reads with

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