moomindani opened a new pull request #1402:
URL: https://github.com/apache/hive/pull/1402
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### What changes were proposed in this pull request?
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This change makes it possible for users to choose an implementation of
IMetaStoreClient via HiveConf, i.e. hive-site.xml.
This patch is to retry merging the patch of HIVE-12679.
I talked with Austin, the original contributor for this issue, and he said
it is okay to submit this patch again.
https://issues.apache.org/jira/browse/HIVE-12679
### Why are the changes needed?
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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 Hive.java 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.
### Does this PR introduce _any_ user-facing change?
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Yes. User will be able to specify own implementation of IMetaStoreClient.
(e.g. IMetaStoreClient for AWS Glue Data Catalog).
### How was this patch tested?
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Unit test and integration test with Glue Data Catalog client.
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