Sharing my experience here.
1) Never had any issues with different size DCs. If the hardware is the
same, keep the # to 256.
2) In most of the cases I keep the 256 vnodes and no performance problems
(when they are triggered, the cause is not the vnodes #)
Regards,
Carlos Juzarte Rolo
Cassandra
Colin,
When you said larger number of tokens has Query performance hit, is it read
or write performance. Also if you have any links you could share to shed
some light on this it would be great.
Thanks
Anishek
On Sun, Mar 29, 2015 at 2:20 AM, Colin Clark co...@clark.ws wrote:
I typically use a
I typically use a # a lot lower than 256, usually less than 20 for num_tokens
as a larger number has historically had a dramatic impact on query performance.
—
Colin Clark
co...@clark.ws
+1 612-859-6129
skype colin.p.clark
On Mar 28, 2015, at 3:46 PM, Eric Stevens migh...@gmail.com wrote:
If
If you're curious about how Cassandra knows how to replicate data in the
remote DC, it's the same as in the local DC, replication is independent in
each, and you can even set a different replication strategy per keyspace
per datacenter. Nodes in each DC take up num_tokens positions on a ring,
I would recommend you utilise Cassandra’s Vnodes config and let it manage this
itself.
This means it will create these and a mange them all on its own and allows
quick and easy scaling and boot strapping.
From: Björn Hachmann
bjoern.hachm...@metrigo.demailto:bjoern.hachm...@metrigo.de
Hi,
we currently plan to add a second data center to our Cassandra-Cluster. I
have read about this procedure in the documentation (eg.
https://www.datastax.com/documentation/cassandra/2.1/cassandra/operations/ops_add_dc_to_cluster_t.html),
but at least one question remains:
Do I have to provide
http://www.datastax.com/documentation/cassandra/2.0/cassandra/configuration/configCassandra_yaml_r.html?scroll=reference_ds_qfg_n1r_1k__num_tokens
So go with a default 256, and leave initial token empty:
num_tokens: 256
# initial_token:
Cassandra will always give each node the same number of
2015-03-27 11:58 GMT+01:00 Sibbald, Charles charles.sibb...@bskyb.com:
Cassandra’s Vnodes config
Thank you. Yes, we are using vnodes! The num_token parameter controls the
number of vnodes assigned to a specific node.
Might be I am seeing problems where are none.
Let me rephrase my
