Matt McCline created HIVE-25191:
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Summary: Modernize Hive Thrift CLI Service Protocol
Key: HIVE-25191
URL: https://issues.apache.org/jira/browse/HIVE-25191
Project: Hive
Issue Type: Bug
Reporter: Matt McCline
Assignee: Matt McCline
Unnecessary errors are occurring with the advent of proxy use such as Gateways
between the Hive client and Hive Server 2. Query failures can be due to
arbitrary proxy timeouts. This proposal avoids the timeouts by changing the
protocol to do regular polling. Currently, the Hive client uses one request for
the query compile request. Long query compile times make those requests
vulnerable to the arbitrary proxy timeouts.
Another issue is Hive Server 2 sometimes does not notice the client has failed
or has lost interest in a potentially long running query. This causes Hive
locks and Big Data query resources to be held unnecessarily. The assumption is
the client issues a cancel query request when it gets an error. This assumption
does not always hold. If the proxy returned an error itself, that proxy may
reject the subsequent cancel request, too. And, if the client is killed or the
network is down, the client cannot complete a cancel request. The proposed
solution here is for Hive Server 2 to watch that the client is sending regular
polling requests for status. If a client ceases those requests, then Hive
Server 2 will cancel the query.
Hive owns the JDBC path (i.e. HiveDriver). The ODBC path may be more
challenging because vendors provide ODBC drivers and Hive does not own the ODBC
protocol.
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