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From: Alain RODRIGUEZ <arodrime@gmail.com>
Date: Wed, 13 Mar 2013 18:11:04 +0100
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 <CA+VSrLoKgTZLdhaFXiN3sUHQcjHQSwOJA0KSd99FCAqr=t4s=A@mail.gmail.com>
Subject: About the heap
To: user@cassandra.apache.org
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Hi,

I would like to know everything that is in the heap.

We are here speaking of C*1.1.6

Theory :

- Memtable (1024 MB)
- Key Cache (100 MB)
- Row Cache (disabled, and serialized with JNA activated anyway, so should
be off-heap)
- BloomFilters (about 1,03 GB - from cfstats, adding all the "Bloom Filter
Space Used" and considering they are showed in Bytes - 1103765112)
- Anything else ?

So my heap should be fluctuating between 1,15 GB and 2.15 GB and growing
slowly (from the new BF of my new data).

My heap is actually changing from 3-4 GB to 6 GB and sometimes growing to
the max 8 GB (crashing the node).

Because of this I have an unstable cluster and have no other choice than
use Amazon EC2 xLarge instances when we would rather use twice more EC2
Large nodes.

What am I missing ?

Practice :

Is there a way not inducing any load and easy to do to dump the heap to
analyse it with MAT (or anything else that you could advice) ?

Alain

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<div dir=3D"ltr">Hi,<div><br></div><div style>I would like to know everythi=
ng that is in the heap.</div><div style><br></div><div style>We are here sp=
eaking of C*1.1.6</div><div style><br></div><div style>Theory :</div><div s=
tyle>

<br></div><div style>- Memtable (1024 MB)<br></div><div style>- Key Cache (=
100 MB)</div><div style>- Row Cache (disabled, and serialized with JNA acti=
vated anyway, so should be off-heap)</div><div style>- BloomFilters (about =
1,03 GB - from cfstats, adding all the &quot;Bloom Filter Space Used&quot; =
and considering they are showed in Bytes - 1103765112)</div>

<div style>- Anything else ?</div><div style><br></div><div style>So my hea=
p should be fluctuating between 1,15 GB and 2.15 GB and growing slowly (fro=
m the new BF of my new data).</div><div style><br></div><div style>My heap =
is actually changing from 3-4 GB to 6 GB and sometimes growing to the max 8=
 GB (crashing the node).</div>

<div style><br></div><div style>Because of this I have an unstable cluster =
and have no other choice than use Amazon EC2 xLarge instances when we would=
 rather use twice more EC2 Large nodes.</div><div style><br></div><div styl=
e>

What am I missing ?</div><div style><br></div><div style>Practice :</div><d=
iv style><br></div><div style>Is there a way not inducing any load and easy=
 to do to dump the heap to analyse it with MAT (or anything else that you c=
ould advice) ?</div>

<div style><br></div><div style>Alain</div></div>

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