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From rohit bhatia <rohit2...@gmail.com>
Subject Re: MeteredFlusher in system.log entries
Date Wed, 06 Jun 2012 04:12:04 GMT
Hi Aaron

Thanks for the link, I have gone through it. But this doesn't justify
nodes of exactly same config/specs differing in their flushing
frequency.
The traffic on all node is same as we are using RandomPartitioner

Thanks
Rohit

On Wed, Jun 6, 2012 at 12:24 AM, aaron morton <aaron@thelastpickle.com> wrote:
> See the section on memtable_total_space_in_mb here
>  http://thelastpickle.com/2011/05/04/How-are-Memtables-measured/
>
> Cheers
> -----------------
> Aaron Morton
> Freelance Developer
> @aaronmorton
> http://www.thelastpickle.com
>
> On 6/06/2012, at 2:27 AM, rohit bhatia wrote:
>
> I am trying to understand the variance in flushes frequency in a 8
> node Cassandra cluster.
> All the flushes are of the same type and initiated by MeteredFlusher.java =>
>
> "INFO [OptionalTasks:1] 2012-06-05 06:32:05,873 MeteredFlusher.java
> (line 62) flushing high-traffic column family CFS(Keyspace='Stats',
> ColumnFamily='Minutewise_Channel_Stats') (estimated 501695882 bytes)"
> [taken from system.log]
>
> Number of flushes for 1 column family vary from 6 flushes per day to
> 24 flushes per day among nodes of same configuration and same
> hardware.
> Could you please throw light on the what conditions does
> MeteredFlusher use to trigger memtable flushes.
> Also how accurate is the estimated size in the above logfile entry.
>
> Regards
> Rohit Bhatia
> Software Engineer, Media.net
>
>

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