/ dgraph Public
Fix for 2137 and 2138 #2140
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#2137 was caused because retrieveSnapshot happens in a blocking fashion, and say when it is called the first time we don't have leader information, then because membership update doesn't happen we never get the leader.
#2138 happens because we might receive a request even before a node is initialized and even if we are not the leader. Now
Leader()only returns leader for a group, so if we can't find one we will update state and retry.
This change is