[Samza Wiki] Update of "FAQ" by ChrisRiccomini

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The "FAQ" page has been changed by ChrisRiccomini:
https://wiki.apache.org/samza/FAQ?action=diff&rev1=4&rev2=5

  
  Note that the first two configurations also have system-level settings(i.e. systems.<your system>.samza.reset.offset and systems.<your system>.samza.offset.default).
  
+ == How should Samza be run on AWS?
+ 
+ From Gian Merlino:
+ 
+ 
+       We've been using Samza in production on AWS for a little over a month.
+       We're just using the YARN runner on a mostly stock hadoop 2.4.0 cluster
+       (not EMR). Our experience is that c3s work well for the YARN instances and
+       i2s work well for the Kafka instances. Things have been pretty solid with
+       that setup.
+       
+       For scaling up and scaling down YARN, we just terminate instances or add
+       instances, and this works pretty well. It can take a few minutes for the
+       cluster to realize a node has gone and respawn containers elsewhere.
+       
+       We have a separate Kafka cluster just for Samza's use, different from our
+       main Kafka cluster. The main reason is that we wanted to isolate off the
+       disk and network load of state compactions and restores (we don't use
+       compacted topics in our main Kafka cluster, but we do use them with Samza,
+       and the extra load on Kafka can be substantial).
+