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From Dor Laor <...@scylladb.com>
Subject Re: [EXTERNAL] Re: Good way of configuring Apache spark with Apache Cassandra
Date Thu, 10 Jan 2019 04:22:45 GMT
On Wed, Jan 9, 2019 at 7:28 AM Durity, Sean R <SEAN_R_DURITY@homedepot.com>
wrote:

> I think you could consider option C: Create a (new) analytics DC in
> Cassandra and run your spark nodes there. Then you can address the scaling
> just on that DC. You can also use less vnodes, only replicate certain
> keyspaces, etc. in order to perform the analytics more efficiently.
>

But this way you duplicate the entire dataset RF times over. It's very very
expensive.
It is a common practice to run Spark on a separate Cassandra (virtual)
datacenter but it's done
in order to isolate the analytic workload from the realtime workload for
isolation and low latency guarantees.
We addressed this problem elsewhere, beyond this scope.


>
>
>
> Sean Durity
>
>
>
> *From:* Dor Laor <dor@scylladb.com>
> *Sent:* Friday, January 04, 2019 4:21 PM
> *To:* user@cassandra.apache.org
> *Subject:* [EXTERNAL] Re: Good way of configuring Apache spark with
> Apache Cassandra
>
>
>
> I strongly recommend option B, separate clusters. Reasons:
>
>  - Networking of node-node is negligible compared to networking within the
> node
>
>  - Different scaling considerations
>
>    Your workload may require 10 Spark nodes and 20 database nodes, so why
> bundle them?
>
>    This ratio may also change over time as your application evolves and
> amount of data changes.
>
>  - Isolation - If Spark has a spike in cpu/IO utilization, you wouldn't
> want it to affect Cassandra and the opposite.
>
>    If you isolate it with cgroups, you may have too much idle time when
> the above doesn't happen.
>
>
>
>
>
> On Fri, Jan 4, 2019 at 12:47 PM Goutham reddy <goutham.chirutha@gmail.com>
> wrote:
>
> Hi,
>
> We have requirement of heavy data lifting and analytics requirement and
> decided to go with Apache Spark. In the process we have come up with two
> patterns
>
> a. Apache Spark and Apache Cassandra co-located and shared on same nodes.
>
> b. Apache Spark on one independent cluster and Apache Cassandra as one
> independent cluster.
>
>
>
> Need good pattern how to use the analytic engine for Cassandra. Thanks in
> advance.
>
>
>
> Regards
>
> Goutham.
>
>
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