Hi Santosh, Are you referring to the application logging (log files) or signing in/out?
Thanks, Nicolaas On 9 Aug 2013, at 07:59, Santosh Kumar wrote: > 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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