[HDFS-2667] HA: Fix NN Active->Standby transition

• Type: Sub-task
• Status: Resolved
• Priority: Major
• 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: 13/Dec/11 03:34
• Updated: 16/Dec/11 16:36
• Resolved: 16/Dec/11 04:25

Description

Currently when the active transitions to standby (eg for a manual failover) the EditLogTailer starts tailing edits at the wrong transaction ID. This causes it to double-apply a bunch of edits, which causes various problems. We need to add a test which checks this state transition and fix any related bugs.