On Sat, Jul 21, 2012 at 3:37 PM, Sylvain Lebresne wrote:
>> I don't know much about Cassandra internals, but from a user point of
>> view, a scan for a range of tokens is not a common use-case.
>
> All of boostrap/move/decommission/repair rely heavily on being able to
> scan efficiently a range of
gt; would have to be scanned to find the ones whose token was in the required
> token range.
>
> Cheers
>
> -
> Aaron Morton
> Freelance Developer
> @aaronmorton
> http://www.thelastpickle.com
>
> On 20/07/2012, at 4:46 AM, prasenjit mukherjee wrote:
wrote:
> Hi Prasenjit,
>
> I don't see the need to recalculate anything. One key has a one MD5
> hash, it doesn't change. Just use the hash to select a node, than just
> the plain key. Can you elaborate on the redistribution please?
>
> Regards,
> P.
>
> On
I agree.
The probem could be while redistributing the tokens. In that case the
hashes has to be recalculated on each fo the candidate node.
-Thanks,
Prasenjit
On Thu, Jul 19, 2012 at 12:19 PM, Patrik Modesto
wrote:
> Hi,
>
> I know that RandomPartitioner does MD5 of a key and the MD5 is then
>
Appreciate the insightful replies. Understood Sylvain's argument that
having different partitioning locally and globally could create
problem in data movement.
Edward, for a given sstable in a node, why having lexicographically
closer rows clumped together should matter ? Anyways the lookups for
>
> It depends on what partitioner you use. You should be using the
> RandomPartitioner, and if so, the rows are sorted by the hash of the row
> key. there are partitioners that sort based on the raw key value but these
> partitioners shouldn't be used as they have problems due to uneven
> partitio
---
> Aaron Morton
> Freelance Developer
> @aaronmorton
> http://www.thelastpickle.com
>
> On 12/07/2012, at 8:05 PM, prasenjit mukherjee wrote:
>
> Thanks. Some follow up questions :
>
> 1. How do the reads use strategy/snitch information ? I am assuming
> the reads can go to any of t
ood reason not too
> (and you probably don't). The way that replicas are chosen when multiple
> racks are in play can be fairly confusing and lead to a data imbalance if
> you don't catch it.
>
>
> On Wed, Jul 11, 2012 at 10:53 PM, prasenjit mukherjee
> wrote:
>>
ault ordering of
> same-node < same-rack < same-datacenter < different-datacenter. Each snitch
> has methods to tell Cassandra which rack and DC a node is in, so it always
> knows which node is closest. Used with the Bloom filters this can tell us
> where the nearest
Any reason we dont have CompositeType data structure for
key_validation_class ( ref:
http://www.datastax.com/docs/0.8/configuration/storage_configuration#key-validation-class)
? I would like to create row_names in the form username:mmddhhmm
( e.g. joe:201206092312 ). I can still do that
key_va
Thanks for the response. Further questions inline..
On Mon, Jul 9, 2012 at 11:50 AM, samal wrote:
>> 1. With RandomPartitioner, on a given node, are the keys sorted by
>> their hash_values or original/unhashed keys ?
>
> hash value,
1. Based on the second answer in
http://stackoverflow.com/que
n Morton
> Freelance Developer
> @aaronmorton
> http://www.thelastpickle.com
>
> On 7/07/2012, at 11:52 PM, prasenjit mukherjee wrote:
>
> Wondering how a rangequery request is handled if RP is used. Will the
> receiving node do a fan-out to all the nodes in the ring or
ge is distributed across the ring, so essentially
either it send has to send the request to all nodes in the ring or
just do a local processing.
On Sat, Jul 7, 2012 at 7:47 PM, Edward Capriolo wrote:
> On Sat, Jul 7, 2012 at 9:26 AM, prasenjit mukherjee
> wrote:
>> Wondering how a rang
Wondering how a rangequery request is handled if RP is used. Will the
receiving node do a fan-out to all the nodes in the ring or it will
just execute the rangequery on its own local partition ?
-Prasenjit
Wondering how a rangequery request is handled if RP is used. Will the
receiving node do a fan-out to all the nodes in the ring or it will
just execute the rangequery on its own local partition ?
--
Sent from my mobile device
I am using cassandar version 1.1.2. I got the document to add node for
version 0.7 : http://www.datastax.com/docs/0.7/getting_started/configuring
Is it still valid ? Is there a documentation on this topic from
cassandra twiki/docs ?
-Prasenjit
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