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From aaron morton <aa...@thelastpickle.com>
Subject Re: help turning compaction..hours of run to get 0% compaction....
Date Mon, 07 Jan 2013 20:51:14 GMT
Take a look at iostat -x 5 to see if your disks are dogging it. 

Cheers

-----------------
Aaron Morton
Freelance Cassandra Developer
New Zealand

@aaronmorton
http://www.thelastpickle.com

On 8/01/2013, at 9:13 AM, Michael Kjellman <mkjellman@barracuda.com> wrote:

> Size tiered or leveled compaction?
> 
> From: Brian Tarbox <tarbox@cabotresearch.com>
> Reply-To: "user@cassandra.apache.org" <user@cassandra.apache.org>
> Date: Monday, January 7, 2013 12:03 PM
> To: "user@cassandra.apache.org" <user@cassandra.apache.org>
> Subject: help turning compaction..hours of run to get 0% compaction....
> 
> I have a column family where I'm doing 500 inserts/sec for 12 hours or so at time.  At
some point my performance falls off a cliff due to time spent doing compactions.
> 
> I'm seeing row after row of logs saying that after 1 or 2 hours of compactiing it reduced
to 100% of 99% of the original.
> 
> I'm trying to understand what direction this data points me to in term of configuration
change.
> 
>    a) increase my compaction_throughput_mb_per_sec because I'm falling behind (am I falling
behind?) 
> 
>    b) enable multi-threaded compaction?
> 
> Any help is appreciated.
> 
> Brian
> 
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