[SPARK-3133] Piggyback get location RPC call to fetch small blocks

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Not A Problem
• Component/s: Block Manager, Spark Core
• Target Version/s: 1.2.0
• Assignee: Reynold Xin
• Reporter: Reynold Xin
• Created: 19/Aug/14 20:21
• Updated: 17/May/20 18:21
• Resolved: 02/May/15 08:15

Description

We should add a new API to the BlockManagerMasterActor to get location or the data block directly if the data block is small.

This effectively makes TorrentBroadcast behaves similarly to HttpBroadcast for small blocks.

Issue Links

• links to: [Github] Pull Request #2069 (rxin)
• links to: [Github] Pull Request #2681 (davies)