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From "Arun C Murthy (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-848) randomwriter generates too many errors of type: org.apache.hadoop.dfs.AlreadyBeingCreatedException
Date Mon, 25 Dec 2006 07:08:21 GMT
randomwriter generates too many errors of type: org.apache.hadoop.dfs.AlreadyBeingCreatedException
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                 Key: HADOOP-848
                 URL: http://issues.apache.org/jira/browse/HADOOP-848
             Project: Hadoop
          Issue Type: Bug
          Components: mapred
    Affects Versions: 0.9.2
            Reporter: Arun C Murthy


randomwriter with speculative execution turned 'on' fails with too many errors:

2006-12-25 06:50:38,880 INFO org.apache.hadoop.mapred.TaskInProgress: Error from task_0002_m_002175_1:
org.apache.hadoop.ipc.RemoteException: org.apache.hadoop.dfs.AlreadyBeingCreatedException:
failed to create file /randomwriter/input/part000522 for DFSClient_task_0002_m_002101_1 on
client XXX because pendingCreates is non-null.
2006-12-25 06:50:48,203 INFO org.apache.hadoop.mapred.TaskInProgress: Error from task_0002_m_002213_1:
org.apache.hadoop.ipc.RemoteException: org.apache.hadoop.dfs.AlreadyBeingCreatedException:
failed to create file /randomwriter/input/part000623 for DFSClient_task_0002_m_002213_1 on
client XXX because pendingCreates is non-null.
2006-12-25 06:50:49,917 INFO org.apache.hadoop.mapred.TaskInProgress: Error from task_0002_m_002211_1:
org.apache.hadoop.ipc.RemoteException: org.apache.hadoop.dfs.AlreadyBeingCreatedException:
failed to create file /randomwriter/input/part000621 for DFSClient_task_0002_m_002211_1 on
client XXX because pendingCreates is non-null.
2006-12-25 06:50:52,812 INFO org.apache.hadoop.mapred.TaskInProgress: Error from task_0002_m_002247_1:
org.apache.hadoop.ipc.RemoteException: org.apache.hadoop.dfs.AlreadyBeingCreatedException:
failed to create file /randomwriter/input/part000654 for DFSClient_task_0002_m_002247_1 on
client XXX because pendingCreates is non-null.

I suspect this is due to the the fact that randomwriter doesn't use the PhasedFileSystem.

-*-*-

Unrelated note: can we add the 'examples' *Component* to this project here on jira? I've put
in 'mapred' for this issue for now, please feel free to correct me. Thanks!

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