[HDFS-2634] Standby needs to ingest latest edit logs before transitioning to active`

• Type: Sub-task
• Status: Resolved
• Priority: Critical
• 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: 05/Dec/11 23:05
• Updated: 09/Dec/11 14:03
• Resolved: 08/Dec/11 23:55

Description

When the standby transitions to active state, it needs to read the latest edit logs before it reopens them for write access. Currently, the transition calls stopStandbyServices, which stops the tailer, but doesn't read ahead to the very end. This ends up leaving the shared edits dir in an inconsistent state where we have overlapping transaction IDs.