[HDFS-980] Convert FSNamesystem lock to ReadWriteLock

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Duplicate
• Affects Version/s: 0.22.0
• Component/s: namenode
• Assignee: Unassigned
• Reporter: Todd Lipcon
• Created: 16/Feb/10 04:15
• Updated: 14/Apr/10 05:44
• Resolved: 14/Apr/10 05:44

Description

As Dhruba noted here there would be substantial benefits to converting the FSNamesystem lock over to a ReadWriteLock. The first would be an ability to provide concurrent readers with a throughput increase, and the second would be more safety for operations like in HDFS-909.

Issue Links

• relates to: HDFS-909 Race condition between rollEditLog or rollFSImage ant FSEditsLog.write operations corrupts edits log