[IMPALA-4740] Add option to use hdfsPread() instead of hdfsRead() for HDFS hedged reads

• Type: New Feature
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Impala 2.8.0
• Fix Version/s: Impala 2.9.0
• Component/s: Backend
• Target Version: Product Backlog
• Assignee: Matthew Jacobs
• Reporter: Matthew Jacobs
• Created: 06/Jan/17 22:48
• Updated: 12/Feb/17 20:13
• Resolved: 03/Feb/17 17:52

Description

In order to use HDFS hedged reads, the hdfsPread API must be used instead of the hdfsRead() call. We should add an option to use hdfsPread().

Issue Links

• relates to: IMPALA-4917 add tests and measure limits/recommendations for hedged reads