[HADOOP-9657] NetUtils.wrapException to have special handling for 0.0.0.0 addresses and :0 ports

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.7.0
• Fix Version/s: 2.9.0, 3.0.0, 3.1.0
• Component/s: net
• Target Version/s: 2.9.0
• Hadoop Flags: Reviewed
• Assignee: Varun Saxena
• Reporter: Steve Loughran
• Created: 20/Jun/13 09:52
• Updated: 24/Oct/17 23:49
• Resolved: 24/Oct/17 21:56

Description

when an exception is wrapped, it may look like 0.0.0.0:0 failed on connection exception: java.net.ConnectException: Connection refused; For more details see: http://wiki.apache.org/hadoop/ConnectionRefused

We should recognise all zero ip addresses and 0 ports and flag them as "your configuration of the endpoint is wrong", as it is clearly the case

Issue Links

• is depended upon by: HADOOP-11574 Uber-JIRA: improve Hadoop network resilience & diagnostics
• is related to: HDFS-8068 Do not retry rpc calls If the proxy contains unresolved address