[HADOOP-4684] NativeS3FileSystem always tries to create a bucket, even when used for read-only workflows.

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Duplicate
• Affects Version/s: 0.19.0
• Component/s: fs/s3

Environment

I tried this in Mac OSX Leopard and Ubuntu Linux on EC2

• Assignee: Unassigned
• Reporter: Elias Torres
• Created: 19/Nov/08 16:41
• Updated: 23/Apr/09 19:25
• Resolved: 21/Nov/08 15:54

Description

I'm running two types of workflow. The first is a set of map jobs that read from S3 using s3n://ID:SECRET@bucket/ as input and HDFS as output. The other is using distcp as a backup tool to copy the outputs of other jobs using distcp.

hadoop distcp hdfs://host:50001/user/root/from/ s3n://ID:SECRET@backup-bucket/

Unfortunately, I'm getting too many failures of this kind:

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

The issue is that Jets3tNativeFileSystemStore always tries to create a bucket during initialization. I'm sure that's a good thing for when s3n is used to write output, but for read operations, it'd be best if it checked for existence first. IMHO.