[HIVE-5217] Add long polling to asynchronous execution in HiveServer2

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.13.0
• Fix Version/s: 0.13.0
• Component/s: HiveServer2

Release Note

Change to use Long polling as described in description.
Adds hive.server2.long.polling.timeout configuration parameter, which can be used to configure how long the long poll waits. Most users would not need to bother about changing this configuration parameter.

• Assignee: Vaibhav Gumashta
• Reporter: Vaibhav Gumashta
• Created: 05/Sep/13 04:41
• Updated: 30/Jun/14 01:26
• Resolved: 22/Feb/14 22:53

Description

HIVE-4617 provides support for async execution in HS2. The client gets an operation handle which it can poll to check on the operation status. However, the polling frequency is entirely left to the client which can be resource inefficient. Long polling will solve this, by blocking the client request to check the operation status for a configurable amount of time (a new HS2 config) if the data is not available, but responding immediately if the data is available.

Issue Links

• blocks: HIVE-5232 Make JDBC use the new HiveServer2 async execution API by default
• is blocked by: HIVE-4617 Asynchronous execution in HiveServer2 to run a query in non-blocking mode
• relates to: HIVE-5230 Better error reporting by async threads in HiveServer2