[HDFS-2653] DFSClient should cache whether addrs are non-local when short-circuiting is enabled

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.23.1, 1.0.0
• Fix Version/s: 0.23.1, 1.1.0
• Component/s: datanode
• Hadoop Flags: Reviewed
• Assignee: Eli Collins
• Reporter: Eli Collins
• Created: 10/Dec/11 02:23
• Updated: 05/Mar/12 02:49
• Resolved: 13/Dec/11 07:59

Description

Something Todd mentioned to me off-line.. currently DFSClient doesn't cache the fact that non-local reads are non-local, so if short-circuiting is enabled every time we create a block reader we'll go through the isLocalAddress code path. We should cache the fact that an addr is non-local as well.