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• There will be a single hive instance. possibly spanning multiple clusters (both dfs and mr)
• There will be a single hive metastore to keep track of the table/partition locations across different clusters.
• A table/partition can exist in more than one cluster. However, a single table will have a primary cluster, and can have multiple
  secondary clusters. A table T1's primary cluster is C1 meaning :1) C1 contains
  all data that is available in all other clusters. 2) write is only
  allowed in this cluster for table C1. but need to allow exceptions
  here 3) new partitions are only allowed to be created in C1. 4) all
  data changes to T1 happened in the primary cluster should be
  replicated to other clusters if there are any secondary clusters. but
  there should be a conf to disable it as there are some exception
  situations.

We are planning to make hive run across multiple data centers (physical clusters). We prefer to use hive metastore to provide a
unified namespace.

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