[HDFS-2934] HA: Allow configs to be scoped to all NNs in the nameservice

• Type: Sub-task
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: HA branch (HDFS-1623)
• Fix Version/s: HA branch (HDFS-1623)
• Component/s: ha, namenode
• Target Version/s: HA branch (HDFS-1623)
• Hadoop Flags: Reviewed
• Assignee: Todd Lipcon
• Reporter: Todd Lipcon
• Created: 10/Feb/12 06:13
• Updated: 16/Feb/12 12:44
• Resolved: 15/Feb/12 22:19

Description

Currently, for namenode-specific keys in HA, one must configure them as keyfoo.nameserviceid.namenodeid. However, in many cases all of the NNs in a nameservice would share the same value. So we should allow the configuration of "keyfoo.nameserviceid" to apply to all NNs. The resolution path for these keys would then be:
keyfoo.nameserviceid.nnid
keyfoo.nameserviceid (if above not set)
keyfoo (if neither of above set)