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https://issues.apache.org/jira/browse/HADOOP-2087?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12536706
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Arun C Murthy commented on HADOOP-2087:
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We should just rewrite TestDFSIO (and similar tests) to use *reducer NONE* and
create/write the files in ${mapred.output.dir} from the map tasks:
http://wiki.apache.org/lucene-hadoop/FAQ#9.
> Errors for subsequent requests for file creation after original DFSClient
> goes down..
> -------------------------------------------------------------------------------------
>
> Key: HADOOP-2087
> URL: https://issues.apache.org/jira/browse/HADOOP-2087
> Project: Hadoop
> Issue Type: Bug
> Components: dfs
> Reporter: Gautam Kowshik
> Fix For: 0.15.0
>
>
> task task_200710200555_0005_m_000725_0 started writing a file and the Node
> went down.. so all following file creation attempts were returned with
> AlreadyBeingCreatedException
> I think the dfs should handle cases wherein, if a dfsclient goes down between
> file creation, subsequent creates to the same file could be allowed.
> 2007-10-20 06:23:51,189 INFO org.apache.hadoop.mapred.TaskInProgress: Error
> from task_200710200555_0005_m_000725_0: Task
> task_200710200555_0005_m_000725_0 failed to report status for 606 seconds.
> Killing!
> 2007-10-20 06:23:51,189 INFO org.apache.hadoop.mapred.JobTracker: Removed
> completed task 'task_200710200555_0005_m_000725_0' from
> '[tracker_address]:/127.0.0.1:44198'
> 2007-10-20 06:23:51,209 INFO org.apache.hadoop.mapred.JobInProgress: Choosing
> normal task tip_200710200555_0005_m_000725
> 2007-10-20 06:23:51,209 INFO org.apache.hadoop.mapred.JobTracker: Adding task
> 'task_200710200555_0005_m_000725_1' to tip tip_200710200555_0005_m_000725,
> for tracker '[tracker_address]:/127.0.0.1:50914'
> 2007-10-20 06:28:54,991 INFO org.apache.hadoop.mapred.TaskInProgress: Error
> from task_200710200555_0005_m_000725_1:
> org.apache.hadoop.ipc.RemoteException:
> org.apache.hadoop.dfs.AlreadyBeingCreatedException: failed to create file
> /benchmarks/TestDFSIO/io_data/test_io_825 for
> DFSClient_task_200710200555_0005_m_000725_1 on client 72.30.50.198, because
> this file is already being created by
> DFSClient_task_200710200555_0005_m_000725_0 on 72.30.53.224
> at
> org.apache.hadoop.dfs.FSNamesystem.startFileInternal(FSNamesystem.java:881)
> at org.apache.hadoop.dfs.FSNamesystem.startFile(FSNamesystem.java:806)
> at org.apache.hadoop.dfs.NameNode.create(NameNode.java:276)
> at sun.reflect.GeneratedMethodAccessor10.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:379)
> at org.apache.hadoop.ipc.Server$Handler.run(Server.java:596)
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