On Wed, Mar 5, 2014 at 7:28 PM, Elliot Finley wrote:
> What are the penalties for having them?
>
Vnodes are basically nodes, so the same penalties you would get from a huge
number of nodes... folks have worked on optimizing the worst aspects of
this, but the reality is still that a node with 256
What are the penalties for having them?
On Wed, Mar 5, 2014 at 5:59 PM, Robert Coli wrote:
> On Wed, Mar 5, 2014 at 2:53 PM, Tyler Hobbs wrote:
>
>>
>> Ah, I missed that part. If the replication factor matches the number of
>> nodes in the cluster, then you're correct, it doesn't matter what
On Wed, Mar 5, 2014 at 2:53 PM, Tyler Hobbs wrote:
>
> Ah, I missed that part. If the replication factor matches the number of
> nodes in the cluster, then you're correct, it doesn't matter what tokens
> you assign.
>
And you get no benefit from 3x256 vnodes, but you do pay all the penalties
fo
On Wed, Mar 5, 2014 at 4:48 PM, Elliot Finley wrote:
> How does giving the SSD node a higher number of tokens help anything if
> it's a 3 node cluster with 3 replicas?
Ah, I missed that part. If the replication factor matches the number of
nodes in the cluster, then you're correct, it doesn't m
How does giving the SSD node a higher number of tokens help anything if
it's a 3 node cluster with 3 replicas?
On Wed, Mar 5, 2014 at 3:41 PM, Tyler Hobbs wrote:
> The dynamic snitch wraps whatever snitch you configure (SimpleSnitch,
> PropertyFileSnitch, etc).
>
> The dynamic snitch *will* fa
The dynamic snitch wraps whatever snitch you configure (SimpleSnitch,
PropertyFileSnitch, etc).
The dynamic snitch *will* favor faster replicas, but it might still
under-utilize the SSD nodes. Chris's suggestion to give the SSD nodes a
higher number of tokens will result in them being replicas fo
Are you using the dynamic snitch? Because the SimpleSnitch is the default.
On March 5, 2014 at 5:27:03 PM, Elliot Finley (efinley.li...@gmail.com) wrote:
Keep in mind, for this 3 node cluster, N = 3.
I did a bit more digging and I found this (for future searches on this topic):
http://www.dat
Keep in mind, for this 3 node cluster, N = 3.
I did a bit more digging and I found this (for future searches on this
topic):
http://www.datastax.com/documentation/cassandra/2.0/cassandra/architecture/architectureSnitchDynamic_c.html
http://www.datastax.com/dev/blog/dynamic-snitching-in-cassandra
No. If you have a heterogeneous clusters you should consider adjusting
the number of vnodes per physical node.
On 03/04/2014 10:47 PM, Elliot Finley wrote:
Using Cassandra 2.0.x
If I have a 3 node cluster and 2 of the nodes use spinning drives and 1 of
them uses SSD, will the majority of the
Using Cassandra 2.0.x
If I have a 3 node cluster and 2 of the nodes use spinning drives and 1 of
them uses SSD, will the majority of the reads be routed to the SSD node
automatically because it has faster responses?
TIA,
Elliot
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