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From vkulichenko <valentin.kuliche...@gmail.com>
Subject Re: Newbie: Questions on Ignite over cassandra
Date Thu, 26 Jan 2017 19:26:04 GMT
Hi,

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Jenny B. wrote
> I am exploring Apache Ignite on top of Cassandra as a possible tool to be
> able to give ad-hoc queries on cassandra tables. Using Ignite is it
> possible to able to search or query on any column in the underlying
> cassandra tables, like a RDBMS? Or can the join columns and search columns
> only be partition and clustering columns ?
> 
> If using Ignite, is there still need to create indexes on cassandra ? Also
> how does ignite treat materialized views ? Will there be a need to create
> materialized views ?
> 
> Also any insights into how updates to cassandra release can/will be
> handled by Ignite would be very helpful.

If you execute in-memory SQL queries using Ignite API, you have to load the
data from the store first:
https://apacheignite.readme.io/docs/data-loading#ignitecacheloadcache

Read-through works only for key based access. With queries you don't know
set of required keys in advance, thus only data which is already in memory
is used to execute them.

-Val



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