[SPARK-12392] Optimize a location order of broadcast blocks by considering preferred local hosts

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.5.2
• Fix Version/s: 2.0.0
• Component/s: Spark Core
• Target Version/s: 2.0.0
• Assignee: Takeshi Yamamuro
• Reporter: Takeshi Yamamuro
• Created: 17/Dec/15 05:48
• Updated: 21/Dec/15 22:14
• Resolved: 21/Dec/15 22:14

Description

When multiple workers exist in a host, we can bypass unnecessary remote access for broadcasts; block managers fetch broadcast blocks from the same host instead of remote hosts.

Issue Links

• links to: [Github] Pull Request #10346 (maropu)