[HDFS-132] Namenode in Safemode reports to Simon non-zero number of deleted files during startup

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 0.20.3, 0.21.0, 0.22.0
• Fix Version/s: 0.20.3
• Component/s: namenode
• Hadoop Flags: Incompatible change, Reviewed

Release Note

With this incompatible change, under metrics context "dfs", the record name "FSDirectory" is no longer available. The metrics "files_deleted" from the deleted record "FSDirectory" is now available in metrics context "dfs", record name "namenode" with the metrics name "FilesDeleted".

• Assignee: Suresh Srinivas
• Reporter: Hairong Kuang
• Created: 14/Jun/07 23:55
• Updated: 02/Aug/10 22:20
• Resolved: 07/Apr/10 20:41

Description

Currently when a namenode starts up it may call "delete" when loading edits. But metrics file_deleted is collected and reported in FSDirectory where it does not and is not able to check if namenode is in safemode. So from the monitoring UI, we see non-zero number of files deleted.

A possible fix is to have delete to return the number of files deleted and then the metrics is collected and reported at NameNode the same as other namenode metrics.

Issue Links

• is blocked by: HDFS-1327 TestNameNodeMetrics fails under windows.