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From aaron morton <aa...@thelastpickle.com>
Subject Re: MeteredFlusher in system.log entries
Date Tue, 05 Jun 2012 18:54:22 GMT
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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