Re: New DC / token distribution not balanced

[Mathieu Delsaut]

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Mathieu Delsaut

Studies Engineer @ DSIMB & ENERGY-Lab
  <http://www.dsimb.inserm.fr/><https://www.energylab.re>

Interne : 2357 | Externe : +262 262 93 86 08
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Le jeu. 16 mars 2023 à 21:02, Bowen Song via user 
a écrit :

> No, allocate_tokens_for_local_replication_factor does not exist in
> Cassandra 3. It was introduced in Cassandra 4.0.
>
> Now, may I interest you with an upgrade? Not only Cassandra 4 comes with
> a lots of improvements and bug fixes, it's also a fairly painless
> process. I find it much easier to upgrade Cassandra than other databases
> or similar distributed software.
>
>
> For your question about allocate_tokens_* , you can read it here:
> https://issues.apache.org/jira/browse/CASSANDRA-7032
>
> In short, the old vnode token allocation algorithm can cause load
> imbalance between nodes in large clusters, and the new algorithm takes
> the RF into consideration, resulting in a more load-balanced cluster.
>
>
> On 16/03/2023 16:02, Max Campos wrote:
> > Does this exist for Cassandra 3.x?  I know it was in DSE for DSE’s 3.x
> > equivalent, and seems to be in Cassandra 4.x cassandra.yaml.  I don’t
> > see it here, though:
> >
> >
> https://github.com/apache/cassandra/blob/cassandra-3.11/conf/cassandra.yaml
> >
> > BTW:  Wow - what a difference allocate_tokens_* makes.  Living in the
> > RF=3 with 3 nodes world for so many years, I had no idea.  :-)
>

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[Mathieu Delsaut]

<http://www.univ-reunion.fr>

Mathieu Delsaut

Studies Engineer @ DSIMB & ENERGY-Lab
  <http://www.dsimb.inserm.fr/><https://www.energylab.re>

Interne : 2357 | Externe : +262 262 93 86 08
.
<http://www.univ-reunion.fr/>

Re: Data visualization tools for Cassandra

[Mathieu Delsaut]

Try apache zeppelin. It's a pretty young project but very useful.
https://zeppelin.incubator.apache.org/

Include a Cassandra and Spark connector among many others.


Mathieu  Delsaut <http://www.univ-reunion.fr/>
*Research Engineer at LE²P*
+262 (0)262 93 86 08
<https://github.com/bilbaoba> <http://www.univ-reunion.fr/>
<http://www.le2p.fr/>
<http://www.univ-reunion.fr/>

2015-10-20 21:24 GMT+04:00 Jon Haddad <jonathan.had...@gmail.com>:

> PySpark (dataframes) + Pandas + Seaborn/Matplotlib
>
> On Oct 20, 2015, at 11:22 AM, Charles Rich <cr...@nastel.com> wrote:
>
> Take a look at jKool, a DataStax partner at jKoolCloud.com
> <http://jkoolcloud.com/>.  It provides visualization for data in DSE.
>
> Regards,
>
> Charley
>
> *From:* Gene [mailto:gh5...@gmail.com <gh5...@gmail.com>]
> *Sent:* Tuesday, October 20, 2015 1:17 PM
> *To:* user@cassandra.apache.org
> *Subject:* Re: Data visualization tools for Cassandra
>
> Have you looked at OpsCenter?
>
> On Tue, Oct 20, 2015 at 9:59 AM, Vikram Kone <vikramk...@gmail.com> wrote:
> Hi,
> We are looking for data visualization tools to chart some graphs over data
> present in our cassandra cluster. Are there any open source visualization
> tools that people are using to quickly draw some charts over data in their
> cassandra tables? We are using Datastax version of cassandra, in case that
> is relevant.
>
>
> thanks
>
> [image: Nastel Technologies] <http://www.nastel.com/>
>
>
>
>
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