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From "Devaraj Das (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4264) DFSIO is failing on 500 nodes cluster
Date Wed, 01 Oct 2008 17:39:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4264?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12636105#action_12636105
] 

Devaraj Das commented on HADOOP-4264:
-------------------------------------

Could it be because of lack of progress reporting while the task is waiting for the datanode?

> DFSIO is failing on 500 nodes cluster
> -------------------------------------
>
>                 Key: HADOOP-4264
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4264
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: io, test
>    Affects Versions: 0.19.0
>            Reporter: Suman Sehgal
>
> On executing following command : 
> bin/hadoop jar ~/hadoop/hadoop-0.19.0-test.jar TestDFSIO -write -nrFiles 990 -fileSize
320     
> This error occurs:
> 08/09/24 06:15:03 INFO mapred.JobClient:  map 98% reduce 32%
> java.io.IOException: Job failed!
> 	at org.apache.hadoop.mapred.JobClient.runJob(JobClient.java:1201)
> 	at org.apache.hadoop.fs.TestDFSIO.runIOTest(TestDFSIO.java:236)
> 	at org.apache.hadoop.fs.TestDFSIO.writeTest(TestDFSIO.java:218)
> 	at org.apache.hadoop.fs.TestDFSIO.main(TestDFSIO.java:354)
> 	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.util.ProgramDriver$ProgramDescription.invoke(ProgramDriver.java:68)
> 	at org.apache.hadoop.util.ProgramDriver.driver(ProgramDriver.java:139)
> 	at org.apache.hadoop.test.AllTestDriver.main(AllTestDriver.java:77)
> 	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.util.RunJar.main(RunJar.java:165)
> 	at org.apache.hadoop.mapred.JobShell.run(JobShell.java:54)
> 	at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
> 	at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:79)
> 	at org.apache.hadoop.mapred.JobShell.main(JobShell.java:68)
> On looking at hadoop logs, It seems that file names are clashing
> 2008-09-24 06:21:41,618 INFO org.apache.hadoop.mapred.JobTracker: Removed completed task
'attempt_200809240600_0005_m_000802_2_1222236048515' from 'tracker_xxxx/client x.x.x.x:xxxxx'
> 2008-09-24 06:21:41,627 INFO org.apache.hadoop.mapred.JobTracker: Adding task 'attempt_200809240600_0005_m_000802_4_1222236048515'
to tip task_200809240600_0005_m_000802, for tracker 'tracker_xxxx/client x.x.x.x:xxxxx'
> 2008-09-24 06:21:41,627 INFO org.apache.hadoop.mapred.JobInProgress: Choosing rack-local
task task_200809240600_0005_m_000802
> 2008-09-24 06:21:41,724 INFO org.apache.hadoop.mapred.TaskInProgress: Error from attempt_200809240600_0005_m_000900_2_1222236048515:
org.apache.hadoop.ipc.RemoteException: org.apache.hadoop.hdfs.protocol.AlreadyBeingCreatedException:
failed to create file /benchmarks/TestDFSIO/io_data/test_io_20 for DFSClient_attempt_200809240600_0005_m_000900_2_1222236048515
on client client x.x.x.x, because this file is already being created by DFSClient_attempt_200809240600_0005_m_000900_0_1222236048515
on client x.x.x.x

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