Commits on Sep 26, 2019

1. Fix isMaster() guards in migration system …

   `node.isMaster()` was being used in migration mechanism
   to detect whether or not a node is master. Depending on this
   check, a process executes or rejects to execute.
   
   But while a migration method is executing under partition service
   lock, the node may become master (when former master leaves the cluster).
   This may cause inconsistenct behaviours during execution of the specific method.
   
   For example, master node increments partition version when a replica ownership
   changes. If a node becomes master while appyling partition table updates,
   the race mentioned above can cause multiple increments of partition version.

   

   mdogan committed Sep 26, 2019
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