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List:       cassandra-user
Subject:    Re: 100 million columns vs 100 million rows/keys
From:       Nick Telford <nick.telford () gmail ! com>
Date:       2010-11-26 17:04:25
Message-ID: AANLkTimNFFOpBedY5pwqNS0TBRHX5SYs9bxxGNcU1iUF () mail ! gmail ! com
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Prior to Cassandra 0.7, there was a limitation of 2GB on row sizes as the
entire row had to fit in memory for compaction. As far as I'm aware, in
Cassandra 0.7, the limit has changed to 2^31 (approximately 2 billion)
columns.

See http://wiki.apache.org/cassandra/CassandraLimitations for more details.

On 26 November 2010 16:45, Marcin <marcin@33concept.com> wrote:

> Hi guys,
>
> I would like to be able to do slices but have been reading that when using
> too many columns under one key Cassandra becomes very slow? Is it true and
> if so what are the suggestions.
>
> P.S.
> The value of the column is just 1 so its quite flat model, reasons behind
> are slicing on name.
>
>
> cheers,
> /Marcin
>

[Attachment #3 (text/html)]

Prior to Cassandra 0.7, there was a limitation of 2GB on row sizes as the entire row \
had to fit in memory for compaction. As far as I&#39;m aware, in Cassandra 0.7, the \
limit has changed to 2^31 (approximately 2 billion) columns.<div> <br></div><div>See \
<meta http-equiv="content-type" content="text/html; charset=utf-8"><a \
href="http://wiki.apache.org/cassandra/CassandraLimitations">http://wiki.apache.org/cassandra/CassandraLimitations</a> \
for more details.<br> <div><br><div class="gmail_quote">On 26 November 2010 16:45, \
Marcin <span dir="ltr">&lt;<a \
href="mailto:marcin@33concept.com">marcin@33concept.com</a>&gt;</span> \
wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px \
#ccc solid;padding-left:1ex;"> Hi guys,<br>
<br>
I would like to be able to do slices but have been reading that when using too many \
columns under one key Cassandra becomes very slow? Is it true and if so what are the \
suggestions.<br> <br>
P.S.<br>
The value of the column is just 1 so its quite flat model, reasons behind are slicing \
on name.<br> <br>
<br>
cheers,<br><font color="#888888">
/Marcin<br>
</font></blockquote></div><br></div></div>



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