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Date: Mon, 29 Oct 2007 14:48:50 -0700 (PDT)
From: "Hairong Kuang (JIRA)" <jira@apache.org>
To: hadoop-dev@lucene.apache.org
Subject: [jira] Commented: (HADOOP-2087) Errors for subsequent requests for
 file creation after original DFSClient goes down..
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    [ https://issues.apache.org/jira/browse/HADOOP-2087?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12538603 ] 

Hairong Kuang commented on HADOOP-2087:
---------------------------------------

I agree with Mukund. It seems to me that it is possible that task_0 was not cleanly killed.

> 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
>
> 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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