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From Austin Lee <>
Subject Allow other implementations of IMetaStoreClient in Hive
Date Tue, 15 Dec 2015 04:48:04 GMT

I would like to propose a change that would make it possible for users to
choose an implementation of IMetaStoreClient via HiveConf, i.e.
hive-site.xml.  Currently, in Hive the choice is hard coded to be
SessionHiveMetaStoreClient in org.apache.hadoop.hive.ql.metadata.Hive.
There is no other direct reference to SessionHiveMetaStoreClient other than
the hard coded class name in and the QL component operates only
on the IMetaStoreClient interface so the change would be minimal and it
would be quite similar to how an implementation of RawStore is specified
and loaded in hive-metastore.  One use case this change would serve would
be one where a user wishes to use an implementation of this interface
without the dependency on the Thrift server.  I would appreciate the
community's input and feedback on this proposal.

Thank you,

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