[HDFS-11188] Change min supported DN and NN versions back to 2.x

• Type: Sub-task
• Status: Resolved
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 3.0.0-alpha1
• Fix Version/s: 3.0.0-alpha2
• Component/s: rolling upgrades
• Target Version/s: 3.0.0-alpha2
• Hadoop Flags: Reviewed
• Assignee: Andrew Wang
• Reporter: Andrew Wang
• Created: 30/Nov/16 01:06
• Updated: 16/Dec/16 01:30
• Resolved: 16/Dec/16 00:50

Description

This is the inverse of HDFS-10398 and HADOOP-13142. Currently, trunk requires a software DN and NN version of 3.0.0-alpha1. This means we cannot perform a rolling upgrade from 2.x to 3.x.

The first step towards supporting rolling upgrade is changing these back to a 2.x version. For reference, branch-2 has these versions set to "2.1.0-beta".