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From Jonathan Ellis <>
Subject Re: issue/minor bug with counters ?
Date Tue, 24 May 2011 16:47:29 GMT
"the total amount of traffic that has gone into the Memtable" is how
throughput is defined, so this is working as expected.

On Tue, May 24, 2011 at 11:15 AM, Yang <> wrote:
> if you have only counter columns in your keyspace, and do a lot of
> updates on a few keys,
> the getLiveSize() of memtable actually returns the total amount of
> traffic that has gone into the Memtable,
> not the real size,
> so you end up producing very small SStables, with only a few KBytes.
> (I have already changed the CF.memtable_throughput memtable_operations
> memtable_flush_after params )
> this can be changed easily by modifying the CounterColumn.resolve() so
> that it updates the
> currentThroughput with the ***difference ****  of old column size and
> new column size, not just the size of new column.

Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of DataStax, the source for professional Cassandra support

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