[HDFS-3103] HA NN should be able to handle some cases of storage dir recovery on start

• Type: Improvement
• Status: Reopened
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 2.0.5-alpha
• Component/s: ha, namenode
• Assignee: Unassigned
• Reporter: Todd Lipcon
• Created: 15/Mar/12 21:24
• Updated: 23/Apr/14 20:25

Description

As a shortcut in developing HA, we elected not to deal with the case of storage directory recovery while HA is enabled. But there are many cases where we can and should handle it. For example, if the user configures two local dirs and one shared dir, but one of the local dirs is empty at startup, we should be able to re-format the empty dir from the other local dir.