[HDFS-956] Improper synchronization in some FSNamesystem methods

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Duplicate
• Affects Version/s: 0.21.0, 0.22.0
• Assignee: Unassigned
• Reporter: Todd Lipcon
• Created: 09/Feb/10 00:32
• Updated: 20/Jan/15 00:48
• Resolved: 14/Apr/10 17:45

Description

There are some methods in FSNamesystem that check isInSafeMode while not synchronized, and then proceed to perform operations. Thus the actual operations can occur after the NN has entered safemode, which is no good.

Issue Links

• is related to: HDFS-909 Race condition between rollEditLog or rollFSImage ant FSEditsLog.write operations corrupts edits log
• is required by: HDFS-988 saveNamespace race can corrupt the edits log
• relates to: HDFS-966 NameNode recovers lease even in safemode