[HADOOP-2044] Namenode encounters ClassCastException exceptions for INodeFileUnderConstruction

• Type: Bug
• Status: Closed
• Priority: Blocker
• Resolution: Fixed
• Fix Version/s: 0.15.0
• Assignee: Dhruba Borthakur
• Reporter: Dhruba Borthakur
• Created: 12/Oct/07 19:54
• Updated: 08/Jul/09 16:42
• Resolved: 17/Oct/07 17:37

Description

A distcp command running on one 400 node cluster shows this exception:

org.apache.hadoop.fs.FSNamesystem: Removing lease [Lease. Holder: 44 46 53 43 6c 69 65 6e 74 5f 74 61 73 6b 5f 32 30 30 37 31 30 31 31 32 32 35 37 5f 30 30 30 33 5f 6d 5f 30 30 30 30 39 32 5f 30, heldlocks: 0, pendingcreates: 0], leases remaining: 736
org.apache.hadoop.dfs.StateChange: DIR* NameSystem.internalReleaseCreate: attempt to release a create lock on /user/xxxx/logs_21/_task_200710112257_0003_m_000027_0/part-00027 file does not exist.
org.apache.hadoop.fs.FSNamesystem: Removing lease [Lease. Holder: 44 46 53 43 6c 69 65 6e 74 5f 74 61 73 6b 5f 32 30 30 37 31 30 31 31 32 32 35 37 5f 30 30 30 33 5f 6d 5f 30 30 30 30 32 37 5f 30, heldlocks: 0, pendingcreates: 0], leases remaining: 735
org.apache.hadoop.fs.FSNamesystem: java.lang.ClassCastException: org.apache.hadoop.dfs.INodeFile cannot be cast to org.apache.hadoop.dfs.INodeFileUnderConstruction
at org.apache.hadoop.dfs.FSNamesystem.internalReleaseCreate(FSNamesystem.java:1566)
at org.apache.hadoop.dfs.FSNamesystem.access$100(FSNamesystem.java:51)
at org.apache.hadoop.dfs.FSNamesystem$Lease.releaseLocks(FSNamesystem.java:1463)
at org.apache.hadoop.dfs.FSNamesystem$LeaseMonitor.run(FSNamesystem.java:1525)
at java.lang.Thread.run(Thread.java:619)