[HADOOP-3007] DataNode pipelining : failure on mirror results in failure on upstream datanode

• Type: Bug
• Status: Closed
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 0.16.0
• Fix Version/s: 0.16.2
• Assignee: Raghu Angadi
• Reporter: Raghu Angadi
• Created: 12/Mar/08 21:24
• Updated: 08/Jul/09 16:42
• Resolved: 21/Mar/08 18:57

Description

When datanode is transfering data to other datanodes (as opposed to a client write()), DN currently receiving the data is supposed to continued to receive even if the downstream (mirror) datanode fails.

I think there are two minor bugs in receiveBlock() :

1. mirrorSock masks this.mirrorSock, which could be set to null by other members like receiveChunk() to indicate failure.
2. when this.mirrorSock is non null, failure to write to it at in receiveBlock() should be handled same way as in receiveChunk().

I am not sure if this should block 0.16.1, but should surely block 0.16.2.