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From: S C <asf11@outlook.com>
To: "user@cassandra.apache.org" <user@cassandra.apache.org>
Subject: RE: validation compaction
Date: Thu, 16 Oct 2014 08:41:12 -0500
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Bob=2C
Default compression is Snappy compression and I have seen compression rangi=
ng between 2-4% (just as the doc says). I got the storage part. Does it mea=
n that as a result of compaction/repair SSTables are decompressed? Is it th=
e reason for CPU utilization spiking up a little?
-SR
From: asf11@outlook.com
To: user@cassandra.apache.org
Subject: RE: validation compaction
Date: Tue=2C 14 Oct 2014 17:09:14 -0500

=0A=
=0A=
=0A=
Thanks Rob.=20


Date: Mon=2C 13 Oct 2014 13:42:39 -0700
Subject: Re: validation compaction
From: rcoli@eventbrite.com
To: user@cassandra.apache.org

On Mon=2C Oct 13=2C 2014 at 1:04 PM=2C S C <asf11@outlook.com> wrote:
=0A=
=0A=
=0A=
I have started repairing a 10 node cluster with one of the table having > 1=
TB of data. I notice that the validation compaction actually shows >3 TB in=
 the "nodetool compactionstats" bytes total. However=2C I have less than 1T=
B data on the machine. If I take into consideration of 3 replicas then 3TB =
makes sense. Per my understanding=2C validation does only care about data l=
ocal to the machine running validation compaction. Am I missing some thing =
here? Any help is much appreciated.=20

Compression is enabled by default=3B it's showing the uncompressed data siz=
e. Your 1TB of data would be 3TB without compression.
=3DRob  		 	   		   		 	   		  =

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{
margin:0px=3B
padding:0px
}
body.hmmessage
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font-size: 12pt=3B
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--></style></head>
<body class=3D'hmmessage'><div dir=3D'ltr'>Bob=2C<div><br></div><div>Defaul=
t compression is Snappy compression and I have seen compression ranging bet=
ween 2-4% (just as the doc says). I got the storage part. Does it mean that=
 as a result of compaction/repair SSTables are decompressed? Is it the reas=
on for CPU utilization spiking up a little?</div><div><br></div><div>-SR<br=
><div><hr id=3D"stopSpelling">From: asf11@outlook.com<br>To: user@cassandra=
.apache.org<br>Subject: RE: validation compaction<br>Date: Tue=2C 14 Oct 20=
14 17:09:14 -0500<br><br>=0A=
=0A=
<style><!--=0A=
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padding:0px=3B=0A=
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<div dir=3D"ltr">Thanks Rob.&nbsp=3B<br><br><br><div><hr id=3D"ecxstopSpell=
ing">Date: Mon=2C 13 Oct 2014 13:42:39 -0700<br>Subject: Re: validation com=
paction<br>From: rcoli@eventbrite.com<br>To: user@cassandra.apache.org<br><=
br><div dir=3D"ltr"><div class=3D"ecxgmail_extra"><div class=3D"ecxgmail_qu=
ote">On Mon=2C Oct 13=2C 2014 at 1:04 PM=2C S C <span dir=3D"ltr">&lt=3B<a =
href=3D"mailto:asf11@outlook.com" target=3D"_blank">asf11@outlook.com</a>&g=
t=3B</span> wrote:<br><blockquote class=3D"ecxgmail_quote" style=3D"border-=
left:1px #ccc solid=3Bpadding-left:1ex=3B">=0A=
=0A=
=0A=
<div><div dir=3D"ltr">I have started repairing a 10 node cluster with one o=
f the table having &gt=3B 1TB of data. I notice that the validation compact=
ion actually shows &gt=3B3 TB in the "nodetool compactionstats" bytes total=
. However=2C I have less than 1TB data on the machine. If I take into consi=
deration of 3 replicas then 3TB makes sense. Per my understanding=2C valida=
tion does only care about data local to the machine running validation comp=
action. Am I missing some thing here? Any help is much appreciated.&nbsp=3B=
<br></div></div></blockquote><div><br></div><div>Compression is enabled by =
default=3B it's showing the uncompressed data size. Your 1TB of data would =
be 3TB without compression.</div><div><br></div><div>=3DRob</div><div>&nbsp=
=3B</div></div></div></div></div> 		 	   		  </div></div></div> 		 	   		  =
</div></body>
</html>=

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