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From Pat Ferrel <...@occamsmachete.com>
Subject Re: Disable hbase user history queries
Date Thu, 01 Jun 2017 20:23:41 GMT
I haven’t done this, it can be done. But why? You always give up performance when instances
are not on the same physical LAN. Recommenders are generally not considered mission critical
where the ultimate HA is required.


On Jun 1, 2017, at 11:19 AM, Martin Fernandez <martingfernandez@gmail.com> wrote:

Thanks Pat for your reply. I am doing Video on Demand e-commerce in which reatime query would
be very helpful but I want to minimize the risks of HDFS synchronization latency between datacenters.
Do you have experience running predictionIO + Universal Recommender in multiple DCs that you
can share? Did you face any latency issue with the HBASE cluster?  

Thanks in advance

On Thu, Jun 1, 2017 at 2:53 PM, Pat Ferrel <pat@occamsmachete.com <mailto:pat@occamsmachete.com>>
wrote:
First, I’m not sure this is a good idea. You loose the realtime nature of recommendations
based on the up-to-the-second recording of user behavior. You get this with live user event
input even without re-calculating the model in realtime.

Second, no you can’t disable queries for user history, it is the single most important key
to personalized recommendations.

I’d have to know more about your application but the first line of cost cutting for us in
custom installations (I work for ActionML the maintainer of the UR Template) is to make the
Spark cluster temporary since it is not needed to serve queries and only needs to run during
training. We start it up, train. then shut it down.

If you really want to shut the entire system down and don’t want realtime user behavior
you can query for all users and put the results in your DB or in-memory cache like a hashmap,
then just serve from your db or in-memory cache. This takes you back to the days of the old
Mahout Mapreduce recommenders (pre 2014) but maybe it fits your app.

If you are doing E-Commerce think about a user’s shopping behavior. They shop, browse, then
buy. Once they buy that old shopping behavior is no longer indicative of realtime intent.
If you miss using that behavior you may miss the shopping session altogether. But again, your
needs may vary.


On Jun 1, 2017, at 6:19 AM, Martin Fernandez <martingfernandez@gmail.com <mailto:martingfernandez@gmail.com>>
wrote:

Hello guys,

we are trying to deploy Universal Recommender + predictionIO in our infrastructure but we
don't want to distribute hbase accross datacenters cause of the latency. So the idea is to
build and train the engine offline and then copy the model and ealstic data to PIO replicas.
I noticed when I deploy engine, it always tries to connect to HBASE server since it is used
to query user history. Is there any way to disable those user history queries and avoid connection
to HBASE?

Thanks

Martin




-- 
Saludos / Best Regards,

Martin Gustavo Fernandez
Mobile: +5491132837292


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