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From Alain RODRIGUEZ <arodr...@gmail.com>
Subject Counters != Counts
Date Wed, 14 Dec 2011 16:29:00 GMT
Hi everybody.

I'm using a lot of counters to make statistics on a 4 nodes cluster (ec2
m1.small) with phpcassa (cassandra v1.0.2).

I store some events and increment counters at the same time.

Counters give me over-counts compared with the count of every corresponding
events.

I sure that my non-counters counts are good.

I'm not sure why these over-counts happen, but I heard that recovering from
commitlogs can produce this.
I have some timeouts on phpcassa which are written in my apache logs while
a compaction is running. However I am always able to write at Quorum, so I
guess I shouldn't have to recover from cassandra commitlogs.

Where can these over-counts come from ?

Alain

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