[YARN-7173] Container update RM-NM communication fix for backward compatibility

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.9.0, 3.0.0-beta1
• Target Version/s: 2.9.0, 3.0.0-beta1
• Hadoop Flags: Reviewed
• Assignee: Arun Suresh
• Reporter: Arun Suresh
• Created: 07/Sep/17 20:09
• Updated: 13/Nov/17 22:39
• Resolved: 12/Sep/17 03:57

Description

This is based on discussions with leftnoteasy in YARN-6979.

In YARN-6979, the getContainersToDecrease() and addAllContainersToDecrease() methods were removed from the NodeHeartbeatResponse (although the actual protobuf fields were still retained). We need to ensure that for clusters that upgrade from 2.8.x to 2.9.0, the decreased containers should also be sent to the NM.