[SPARK-12328] Add connectionEstablished callback to RpcHandler to monitor the new connections

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Duplicate
• Affects Version/s: 1.6.0
• Component/s: Spark Core
• Assignee: Shixiong Zhu
• Reporter: Shixiong Zhu
• Created: 15/Dec/15 00:36
• Updated: 15/Dec/15 00:47
• Resolved: 15/Dec/15 00:47

Description

`NettyRpcHandler` uses a `ConcurrentHashMap` clients to remember if has received any messages from a client to avoid firing multiple `RemoteProcessConnected`.

We can add a callback in the RpcHandler to remove the ConcurrentHashMap from NettyRpcHandler.

Issue Links

• duplicates: SPARK-11097 Add connection established callback to lower level RPC layer so we don't need to check for new connections in NettyRpcHandler.receive
• links to: [Github] Pull Request #10301 (zsxwing)