Hi Nicolaas,
I wanted to know the logging flow of Apereo Oae.
On Mon, Aug 5, 2013 at 2:37 PM, Nicolaas Matthijs <
[email protected]> wrote:
> Hi Santosh,
>
> Redis is used for a number of different things:
>
>
> - It's used for storing and retrieving session information. This is
> needed for every request and we needed this to be as light-weight as
> possible. On top of that, an out-of-the-box Redis session store
> implementation was already available.
> - We are using the Redis PubSub [1] feature to provide cluster-wide
> communication between app servers. For example, this makes it possible to
> inform all app servers that an Admin UI configuration change has been made,
> allowing for all app servers to re-cache that information.
> - Redis is also used as our activity aggregation store [2]. Activity
> aggregation is an intensive operation, and is something that is required a
> lot. Cassandra could have been used for this, but Redis produced better
> performance testing results. This is to be expected as Redis doesn't
> persist to disk. If we lose the aggregation data, aggregate-able activities
> won't be aggregated for a short period of time, but this doesn't result in
> any data loss.
>
>
> So even though Redis isn't used as a canonical data source, it is being
> used for a number of different goals. Therefore, it is currently not
> possible to run OAE with Cassandra only.
>
> [1] http://redis.io/topics/pubsub
> [2]
> https://confluence.sakaiproject.org/display/3AK/Activities#Activities-Aggregation
>
> Hope that helps,
> Nicolaas
>
>
> On 5 Aug 2013, at 07:47, Santosh Kumar wrote:
>
> Hi friends,
>
> I wanted to know why we are using both cassandra and redis
> . Can we use only cassandra instead of Redis
>
>
> --
> Regards
> ----
>
> Santosh Kumar C S
> 8553631248
>
>
>
>
--
Regards
----
Santosh Kumar C S
8553631248
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