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: mapred, 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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