[HDFS-1910] when dfs.name.dir and dfs.name.edits.dir are same fsimage will be saved twice every time

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 0.21.0
• Fix Version/s: 1.1.0, 0.22.1
• Component/s: namenode
• Labels: critical-0.22.0
• Target Version/s: 1.1.0, 0.22.1
• Hadoop Flags: Reviewed
• Assignee: Unassigned
• Reporter: Gokul
• Created: 10/May/11 05:10
• Updated: 17/Oct/12 18:27
• Resolved: 10/Jan/12 02:04

Description

when image and edits dir are configured same, the fsimage flushing from memory to disk will be done twice whenever saveNamespace is done. this may impact the performance of backupnode/snn where it does a saveNamespace during every checkpointing time.

Issue Links

• is related to: HDFS-2126 Improve Namenode startup time [umbrella task]