[HIVE-16172] Switch to a fairness lock to synchronize HS2 thrift client

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.3.0
• Assignee: Tao Li
• Reporter: Tao Li
• Created: 10/Mar/17 07:25
• Updated: 21/Jul/17 18:46
• Resolved: 10/Mar/17 17:14

Description

A synchronized block is used in "org.apache.hive.jdbc.HiveConnection.SynchronizedHandler.invoke(Object, Method, Object[])" to synchronize the client invocations. The problem is that it does not guarantee any fairness. One issue we were seeing is that a cancellation request was not able to be issued to HS2 until all the getOperationStatus() calls are finished from a while loop. Thus the cancellation cannot take effect.