[HDFS-13976] Backport HDFS-12813 to branch-2.9

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.9.2
• Component/s: hdfs, hdfs-client
• Hadoop Flags: Reviewed
• Assignee: Lukas Majercak
• Reporter: Lukas Majercak
• Created: 08/Oct/18 22:17
• Updated: 10/Oct/18 22:21
• Resolved: 10/Oct/18 22:21

Description

2.9 also shows the issue from HDFS-12813:
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

• is part of: HDFS-12813 RequestHedgingProxyProvider can hide Exception thrown from the Namenode for proxy size of 1