[HDFS-3438] BootstrapStandby should not require a rollEdits on active node

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.0-alpha
• Fix Version/s: 2.0.2-alpha
• Component/s: ha
• Hadoop Flags: Reviewed
• Assignee: Todd Lipcon
• Reporter: Todd Lipcon
• Created: 17/May/12 19:51
• Updated: 07/Sep/12 21:09
• Resolved: 19/May/12 05:19

Description

Currently, BootstrapStandby uses a rollEdits() call on the active NN in order to determine the most recent checkpoint and transaction ID. However, this means that you cannot bootstrap a standby when the active NN is in safe mode – i.e you have to start the whole cluster before you can bootstrap a new standby. This makes the workflow to convert an existing cluster to HA more complicated. We should allow BootstrapStandby to work even when the NN is in safe mode.