[HDFS-12813] RequestHedgingProxyProvider can hide Exception thrown from the Namenode for proxy size of 1

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.1.0, 2.10.0, 3.0.3
• Component/s: ha
• Hadoop Flags: Reviewed
• Assignee: Mukul Kumar Singh
• Reporter: Mukul Kumar Singh
• Created: 14/Nov/17 20:35
• Updated: 08/Oct/18 22:18
• Resolved: 21/Nov/17 01:15

Description

HDFS-11395 fixed the problem where the MultiException thrown by RequestHedgingProxyProvider was hidden. However when the target proxy size is 1, then unwrapping is not done for the InvocationTargetException. for target proxy size of 1, the unwrapping should be done till first level where as for multiple proxy size, it should be done at 2 levels.

Issue Links

• incorporates: HDFS-13976 Backport HDFS-12813 to branch-2.9
• is broken by: HDFS-11395 RequestHedgingProxyProvider#RequestHedgingInvocationHandler hides the Exception thrown from NameNode
• relates to: HDFS-13388 RequestHedgingProxyProvider calls multiple configured NNs all the time
• relates to: HDFS-13888 RequestHedgingProxyProvider shows InterruptedException