Mailing-List: contact user-help@cassandra.apache.org; run by ezmlm
Precedence: bulk
Reply-To: user@cassandra.apache.org
Received-SPF: pass (athena.apache.org: domain of jbellis@gmail.com designates
 74.125.82.172 as permitted sender)
DomainKey-Signature: a=rsa-sha1; c=nofws;
        d=gmail.com; s=gamma;
        h=mime-version:in-reply-to:references:from:date:message-id:subject:to
         :content-type:content-transfer-encoding;
        b=xisc33/gxuI2gqWTqK6sFElKVctpaLnuUrnNMYXaL8RKnZX6hMsDBRNVE6iURRxLMh
         hnfq6b/RnZLzRK9H1vtr04zo/Vs5wsHEn3dn8LyxtsHhnMX5TA4YwCirQqgCqs0aKjfs
         2GBPotQhxxwDyKVbTyzQnuovFKp8xzVJ5DbBQ=
MIME-Version: 1.0
In-Reply-To: <BANLkTik1tGByHywoJvHWAQsX=wd_QtXPjQ@mail.gmail.com>
References: <BANLkTik1tGByHywoJvHWAQsX=wd_QtXPjQ@mail.gmail.com>
From: Jonathan Ellis <jbellis@gmail.com>
Date: Tue, 24 May 2011 11:47:29 -0500
Message-ID: <BANLkTinCgW04h9ru6fFev-ujHSw87m5WzA@mail.gmail.com>
Subject: Re: issue/minor bug with counters ?
To: user@cassandra.apache.org
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

"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 <teddyyyy123@gmail.com> 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 **** =A0of old column size and
> new column size, not just the size of new column.

--=20
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of DataStax, the source for professional Cassandra support
http://www.datastax.com