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Date: Mon, 4 Apr 2011 18:24:25 -0400
Message-ID: <BANLkTi=HL3noXdUgdt81FWK____0N1O39Q@mail.gmail.com>
Subject: Re: Abnormal memory consumption
From: openvictor Open <openvictor@gmail.com>
To: user@cassandra.apache.org
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Okay, I see. But isn't there a big issue for scaling here ?
Imagine that I am the developper of a certain very successful website : At
year 1 I need 20 CF. I might need to have 8Gb of RAM. Year 2 I need 50 CF
because I added functionalities to my wonderful webiste will I need 20 Gb of
RAM ? And if at year three I had 300 Column families, will I need 120 Gb of
ram / node ? Or did I miss something about memory consuption ?

Thank you very much,

Victor

2011/4/4 Peter Schuller <peter.schuller@infidyne.com>

> > And about the production 7Gb or RAM is sufficient ? Or 11 Gb is the
> minimum
> > ?
> > Thank you for your inputs for the JVM I'll try to tune that
>
> Production mem reqs are mostly dependent on memtable thresholds:
>
>   http://www.datastax.com/docs/0.7/operations/tuning
>
> If you enable key caching or row caching, you will have to adjust
> accordingly as well.
>
> --
> / Peter Schuller
>

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Okay, I see. But isn&#39;t there a big issue for scaling here ? <br>Imagine=
 that I am the developper of a certain very successful website : At year 1 =
I need 20 CF. I might need to have 8Gb of RAM. Year 2 I need 50 CF because =
I added functionalities to my wonderful webiste will I need 20 Gb of RAM ? =
And if at year three I had 300 Column families, will I need 120 Gb of ram /=
 node ? Or did I miss something about memory consuption ?<br>
<br>Thank you very much,<br><br>Victor<br><br><div class=3D"gmail_quote">20=
11/4/4 Peter Schuller <span dir=3D"ltr">&lt;<a href=3D"mailto:peter.schulle=
r@infidyne.com">peter.schuller@infidyne.com</a>&gt;</span><br><blockquote c=
lass=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;=
padding-left:1ex;">
<div class=3D"im">&gt; And about the production 7Gb or RAM is sufficient ? =
Or 11 Gb is the minimum<br>
&gt; ?<br>
&gt; Thank you for your inputs for the JVM I&#39;ll try to tune that<br>
<br>
</div>Production mem reqs are mostly dependent on memtable thresholds:<br>
<br>
 =A0 <a href=3D"http://www.datastax.com/docs/0.7/operations/tuning" target=
=3D"_blank">http://www.datastax.com/docs/0.7/operations/tuning</a><br>
<br>
If you enable key caching or row caching, you will have to adjust<br>
accordingly as well.<br>
<br>
--<br>
<font color=3D"#888888">/ Peter Schuller<br>
</font></blockquote></div><br>

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