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From Asaf Mesika <asaf.mes...@gmail.com>
Subject Re: HBase becomes ultra-slaggy
Date Mon, 09 Jul 2012 19:36:58 GMT
I got JMX counters hooked up to JConsole (couple of them opened).
Do you have any advice from your experience on what metrics I should focus on  to spot this
issue?

On Jul 9, 2012, at 22:19 PM, Stack wrote:

> On Mon, Jul 9, 2012 at 8:35 PM, Asaf Mesika <asaf.mesika@gmail.com> wrote:
>> Hi,
>> 
>> My cluster started being incredibly slow in the past 2 days.
>> I've seen many Blocking updates on the region server logs, which lead me to believe
HDFS creates is the bottleneck.
>> I ran a small test (hadoop fs -copyFromLocal big3_3Giga.tz.gz /tmp) which copies
a 3.3G file, and I was surprised to see a rate of 11MB/sec, when it was previously around
28MB/sec.
>> 
>> I have 3 RS computers, hosting DataNode and embedded zookeeper as well.
>> And 1 Master computer, hosting NameNode as well.
>> 
>> The slowest computer has Core 2 Duo 2.93GHz, 4GB.
>> 
>> What steps can I take to find out the source of this slowdown?
> 
> Install ganglia or opentsdb and figure what your cluster is up to when its slow.
> 
> St.Ack


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