[HADOOP-15809] ABFS: better exception handling when making getAccessToken call

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.2.0
• Fix Version/s: 3.2.0
• Component/s: fs/azure
• Target Version/s: 3.3.0
• Assignee: Da Zhou
• Reporter: Da Zhou
• Created: 01/Oct/18 22:31
• Updated: 05/Oct/18 11:05
• Resolved: 05/Oct/18 10:30

Description

Currently in getTokenSingleCall(): if it get a HTTP failure response, it tries to consume inputStream in httpUrlConnection, which will always lead to an IOException and this exception never get checked in AzureADAuthenticator.
As a result the httpStatus code is never checked in the retry policy of AzureADAuthenticator. Tthat IOException will be caught by AbfsRestOperation, which will keep on retrying.