[HADOOP-17596] ABFS: Change default Readahead Queue Depth from num(processors) to const

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.3.1
• Fix Version/s: 3.4.0, 3.3.2
• Component/s: fs/azure
• Labels: pull-request-available
• Assignee: Sumangala Patki
• Reporter: Sumangala Patki
• Created: 22/Mar/21 11:05
• Updated: 10/Jul/21 09:40
• Resolved: 10/Jul/21 09:40

Description

The default value of readahead queue depth is currently set to the number of available processors. However, this can result in one inputstream instance consuming more processor time. To ensure equal thread allocation during read for all inputstreams created in a session, we change the default readahead queue depth to a constant (2).

Issue Links

• links to: GitHub Pull Request #2795
• links to: GitHub Pull Request #3106