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From rohit bhatia <rohit2...@gmail.com>
Subject MeteredFlusher in system.log entries
Date Tue, 05 Jun 2012 14:27:53 GMT
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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