[HADOOP-17301] ABFS: read-ahead error reporting breaks buffer management

• Type: Sub-task
• Status: Resolved
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 3.3.0
• Fix Version/s: 3.3.1, 3.4.0
• Component/s: fs/azure
• Labels: pull-request-available
• Assignee: Sneha Vijayarajan
• Reporter: Sneha Vijayarajan
• Created: 07/Oct/20 23:08
• Updated: 14/Oct/20 23:01
• Resolved: 14/Oct/20 23:01

Description

When reads done by readahead buffers failed, the exceptions where dropped and the failure was not getting reported to the calling app. 

Jira HADOOP-16852: Report read-ahead error back

tried to handle the scenario by reporting the error back to calling app. But the commit has introduced a bug which can lead to ReadBuffer being injected into read completed queue twice. 

Issue Links

• is broken by: HADOOP-16852 ABFS: Send error back to client for Read Ahead request failure
• links to: GitHub Pull Request #2369
• links to: GitHub Pull Request #2384