[HDFS-2732] Add support for the standby in the bin scripts

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Won't Fix
• Affects Version/s: HA branch (HDFS-1623)
• Component/s: ha
• Target Version/s: HA branch (HDFS-1623)
• Assignee: Eli Collins
• Reporter: Eli Collins
• Created: 30/Dec/11 00:48
• Updated: 30/Dec/11 03:52
• Resolved: 30/Dec/11 03:52

Description

We need to update the bin scripts to support SBNs. Two ideas:

Modify start-dfs.sh to start another copy of the NN if HA is configured. We could introduce a file similar to masters (2NN hosts) called standbys which lists the SBN hosts, and start-dfs.sh would automatically make the NN it starts active (and leave the NNs listed in standby as is).

Or simpler, we could just provide a start-namenode.sh script that a user can run to start the SBN on another host themselves. The user would manually tell the other NN to be active via HAAdmin (or start-dfs.sh could do that automatically, ie assume the NN it starts should be the primary).