[HADOOP-4318] distcp fails

• Type: Bug
• Status: Resolved
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 0.17.2
• Fix Version/s: 0.17.3
• Hadoop Flags: Reviewed
• Assignee: Tsz-wo Sze
• Reporter: Christian Kunz
• Created: 30/Sep/08 23:35
• Updated: 08/Jul/09 16:51
• Resolved: 03/Oct/08 06:18

Description

we run distcp between two clusters running 0.17.2 using hdfs.

As long as one of the tasks fails after opening a file for writing (which typically always happens), subsequent retries will always fail with the following exception (we did not see this with 0.16.3, seems to be a regression):

2008-09-30 22:54:49,430 INFO org.apache.hadoop.util.CopyFiles: FAIL 3169 : org.apache.hadoop.ipc.RemoteException: org.apache.hadoop.dfs.AlreadyBeingCreatedException: failed to create file xxx/_distcp_tmp_dvml74/3169 for DFSClient_task_200809121811_0034_m_001085_1 on client xxx.yyy.zzz.uuu because current leaseholder is trying to recreate file.
at org.apache.hadoop.dfs.FSNamesystem.startFileInternal(FSNamesystem.java:1010)
at org.apache.hadoop.dfs.FSNamesystem.startFile(FSNamesystem.java:967)
at org.apache.hadoop.dfs.NameNode.create(NameNode.java:269)
at sun.reflect.GeneratedMethodAccessor18.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:446)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:896)

at org.apache.hadoop.ipc.Client.call(Client.java:557)
at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:212)
at org.apache.hadoop.dfs.$Proxy1.create(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:82)
at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:59)
at org.apache.hadoop.dfs.$Proxy1.create(Unknown Source)
at org.apache.hadoop.dfs.DFSClient$DFSOutputStream.<init>(DFSClient.java:2192)
at org.apache.hadoop.dfs.DFSClient.create(DFSClient.java:479)
at org.apache.hadoop.dfs.DistributedFileSystem.create(DistributedFileSystem.java:138)
at org.apache.hadoop.util.CopyFiles$CopyFilesMapper.create(CopyFiles.java:317)
at org.apache.hadoop.util.CopyFiles$CopyFilesMapper.copy(CopyFiles.java:369)
at org.apache.hadoop.util.CopyFiles$CopyFilesMapper.map(CopyFiles.java:493)
at org.apache.hadoop.util.CopyFiles$CopyFilesMapper.map(CopyFiles.java:268)
at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:47)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:219)
at org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:2122)