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Subject: Re: which nodes contain the data? column family as indexes?
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From: aaron morton <aaron@thelastpickle.com>
In-Reply-To: <SNT115-DS2157099A06E406D6D71D2BACAD0@phx.gbl>
Date: Fri, 15 Apr 2011 08:22:10 +1200
Message-Id: <E19DAE7F-F0BB-4687-9D88-618745BE1F21@thelastpickle.com>
References: <SNT115-DS2157099A06E406D6D71D2BACAD0@phx.gbl>
To: user@cassandra.apache.org


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By default all data for a keyspace, and it's CFs, are spread out over =
all nodes in the cluster.

If you want to see which endpoints have data for a particular key there =
is an operation on the o.a.c.db.StorageService MBean you can use via =
JConsole. Some (out of date) docs here may help =
http://wiki.apache.org/cassandra/JmxInterface#org.apache.cassandra.service=
.StorageService.Operations.getNaturalEndpoints

Lots of articles here=20
http://wiki.apache.org/cassandra/ArticlesAndPresentations

Aaron


On 15 Apr 2011, at 04:32, tinhuty he wrote:

> I just started 5 nodes in a cluster and set a replica factor of 3 on a =
keyspace ks. My question is how do I know which 3 nodes will contain the =
data of this keyspace(or particular column family in this keyspace)?
> =20
> I often read that =93use a separate column family for storing our =
indexes=94, here is link for =
that(http://www.datastax.com/docs/0.7/data_model/cfs_as_indexes), but it =
doesn=92t have more details. Could some one point me to more detailed =
documentation and samples for this?
> =20
> Thanks
> =20


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<html><head></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space; =
"><div>By default all data for a keyspace, and it's CFs, are spread out =
over all nodes in the cluster.</div><div><br></div><div>If you want to =
see which endpoints have data for a particular key there is an operation =
on the o.a.c.db.StorageService MBean you can use via JConsole. Some (out =
of date) docs here may help&nbsp;<a =
href=3D"http://wiki.apache.org/cassandra/JmxInterface#org.apache.cassandra=
.service.StorageService.Operations.getNaturalEndpoints">http://wiki.apache=
.org/cassandra/JmxInterface#org.apache.cassandra.service.StorageService.Op=
erations.getNaturalEndpoints</a></div><div><br></div><div>Lots of =
articles here&nbsp;</div><div><a =
href=3D"http://wiki.apache.org/cassandra/ArticlesAndPresentations">http://=
wiki.apache.org/cassandra/ArticlesAndPresentations</a></div><div><br></div=
><div>Aaron</div><div><br></div><br><div><div>On 15 Apr 2011, at 04:32, =
tinhuty he wrote:</div><br class=3D"Apple-interchange-newline"><blockquote=
 type=3D"cite"><div dir=3D"ltr">
<div dir=3D"ltr">
<div style=3D"FONT-FAMILY: 'Calibri'; COLOR: #000000; FONT-SIZE: 12pt">
<div><font face=3D"Verdana">I just started 5 nodes in a cluster and set =
a replica=20
factor of 3 on a keyspace ks. My question is how do I know which 3 nodes =
will=20
contain the data of this keyspace(or particular column family in this =
keyspace)?=20
</font></div>
<div><font face=3D"Verdana"></font>&nbsp;</div>
<div><font face=3D"Verdana">I often read that =93use a separate column =
family for=20
storing our indexes=94, here is link for that(<a =
title=3D"http://www.datastax.com/docs/0.7/data_model/cfs_as_indexes" =
href=3D"http://www.datastax.com/docs/0.7/data_model/cfs_as_indexes">http:/=
/www.datastax.com/docs/0.7/data_model/cfs_as_indexes</a>),=20
but it doesn=92t have more details. Could some one point me to more =
detailed=20
documentation and samples for this?</font></div>
<div><font face=3D"Verdana"></font>&nbsp;</div>
<div><font face=3D"Verdana">Thanks</font></div>
<div><font face=3D"Times New =
Roman"></font>&nbsp;</div></div></div></div>
</blockquote></div><br></body></html>=

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