document effects (latency) of storing large amounts of data in znodes

                 Key: ZOOKEEPER-327
             Project: Zookeeper
          Issue Type: Improvement
          Components: documentation
            Reporter: Patrick Hunt
            Priority: Minor
             Fix For: 3.1.1, 3.2.0

znodes have max 1mb of data storage. using zk to store large amounts of data 
can negatively impact latency as seen by clients - the server needs to serve 
the data. often it's a better idea to store a "token" (say a uri) in the znode 
pointing to a large data block stored elsewhere (filesystem? memcached, etc...) 
this offloads zk and reduces latency impact

we should have details of this in the forrest docs.

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