[HDFS-5521] skip checksums when reading a cached block via non-local reads

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Won't Fix
• Affects Version/s: 3.0.0
• Component/s: datanode
• Target Version/s: 3.0.0
• Assignee: Colin Patrick McCabe
• Reporter: Colin Patrick McCabe
• Created: 15/Nov/13 22:00
• Updated: 05/Dec/13 21:00
• Resolved: 05/Dec/13 21:00

Description

The DataNode needs to skip checksumming when reading a cached block via non-local reads. This is like HDFS-5182, but for non-short-circuit.

Issue Links

• is related to: HDFS-5182 BlockReaderLocal must allow zero-copy reads only when the DN believes it's valid