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From Harshit Kumar <hkumar.ar...@gmail.com>
Subject S3 Exception
Date Mon, 26 Oct 2009 04:19:17 GMT
Hi

There is 1 GB of rdf/owl files that I am executing on EC2. Execution throws
the following exception
-------------------

08/11/19 16:08:27 WARN mapred.JobClient: Use GenericOptionsParser for
parsing the arguments. Applications should implement Tool for the
same.
org.apache.hadoop.fs.s3.S3Exception:
org.jets3t.service.S3ServiceException: S3 PUT failed for '/' XML Error
Message: <?xml version="1.0"
encoding="UTF-8"?><Error><Code>OperationAborted</Code><Message>*A
conflicting conditional operation is currently in progress against
**this** resource*. Please try
again.</Message><RequestId>324E696A4BCA8731</RequestId><HostId>{REMOVED}</HostId></Error>
	at org.apache.hadoop.fs.s3native.Jets3tNativeFileSystemStore.createBucket(Jets3tNativeFileSystemStore.java:74)
	at org.apache.hadoop.fs.s3native.Jets3tNativeFileSystemStore.initialize(Jets3tNativeFileSystemStore.java:63)
	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.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:82)
	at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:59)
	at org.apache.hadoop.fs.s3native.$Proxy2.initialize(Unknown Source)
	at org.apache.hadoop.fs.s3native.NativeS3FileSystem.initialize(NativeS3FileSystem.java:215)
	at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:1339)
	at org.apache.hadoop.fs.FileSystem.access$300(FileSystem.java:56)
	at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:1351)
	at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:213)
	at org.apache.hadoop.fs.Path.getFileSystem(Path.java:175)
	at org.apache.hadoop.mapred.FileInputFormat.listStatus(FileInputFormat.java:158)
	at org.apache.hadoop.mapred.FileInputFormat.getSplits(FileInputFormat.java:210)
	at org.apache.hadoop.mapred.JobClient.submitJob(JobClient.java:742)
	at org.apache.hadoop.streaming.StreamJob.submitAndMonitorJob(StreamJob.java:925)
	at org.apache.hadoop.streaming.StreamJob.go(StreamJob.java:115)
	at org.apache.hadoop.streaming.HadoopStreaming.main(HadoopStreaming.java:33)
	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:155)
	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)
Caused by: org.jets3t.service.S3ServiceException: S3 PUT failed for
'/' XML Error Message: <?xml version="1.0"
encoding="UTF-8"?><Error><Code>OperationAborted</Code><Message>A
conflicting conditional operation is currently in progress against
this resource. Please try
again.</Message><RequestId>{REMOVED}</RequestId><HostId>{REMOVED}</HostId></Error>
	at org.jets3t.service.impl.rest.httpclient.RestS3Service.performRequest(RestS3Service.java:424)
	at org.jets3t.service.impl.rest.httpclient.RestS3Service.performRestPut(RestS3Service.java:734)
	at org.jets3t.service.impl.rest.httpclient.RestS3Service.createObjectImpl(RestS3Service.java:1357)
	at org.jets3t.service.impl.rest.httpclient.RestS3Service.createBucketImpl(RestS3Service.java:1234)
	at org.jets3t.service.S3Service.createBucket(S3Service.java:1390)
	at org.jets3t.service.S3Service.createBucket(S3Service.java:1158)
	at org.jets3t.service.S3Service.createBucket(S3Service.java:1177)
	at org.apache.hadoop.fs.s3native.Jets3tNativeFileSystemStore.createBucket(Jets3tNativeFileSystemStore.java:69)
	... 29 more

---------------------
There were like 50 failed map tasks out of total of 1141 maps. Though hadoop
job tracker successfully executed failed tasks again, but if a task fails,
and then restarting it again, takes execution time. If somehow, this
exception can be avoided altogether, program execution will be faster.

Came across a JIRA post that says, the exception is because s3 tries to
create a bucket which it should not create, and a patch is also posted for
the same. Applied the patch, but still the same error.

IMO, this error is because a operation is trying to access a part of file
which is already been accessed by another map job.

Please help resolve this issue or pass on any pointers that can suggest why
is this error happening?

Thanks and Regards

H. Kumar
skype: harshit900
Blog: http://harshitkumar.wordpress.com
Website: http:/kumarharmuscat.tripod.com

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