Matthew Paduano created HADOOP-12689:
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Summary: S3 filesystem operations stopped working correctly
Key: HADOOP-12689
URL: https://issues.apache.org/jira/browse/HADOOP-12689
Project: Hadoop Common
Issue Type: Bug
Affects Versions: 2.8.0, 3.0.0
Reporter: Matthew Paduano
Assignee: Matthew Paduano
Priority: Minor
Fix For: 2.7.1
HADOOP-10542 was resolved by replacing "return null;" with throwing
IOException. This causes several S3 filesystem operations to fail (possibly
more code is expecting that null return value; these are just the calls I
noticed):
S3FileSystem.getFileStatus() (which no longer raises FileNotFoundException but
instead IOException)
FileSystem.exists() (which no longer returns false but instead raises
IOException)
S3FileSystem.create() (which no longer succeeds but instead raises IOException)
Run command:
hadoop distcp hdfs://localhost:9000/test s3://xxx:[email protected]/
Resulting stack trace:
2015-12-11 10:04:34,030 FATAL [IPC Server handler 6 on 44861]
org.apache.hadoop.mapred.TaskAttemptListenerImpl: Task:
attempt_1449826461866_0005_m_000006_0 - exited : java.io.IOException: /test
doesn't exist
at
org.apache.hadoop.fs.s3.Jets3tFileSystemStore.get(Jets3tFileSystemStore.java:170)
at
org.apache.hadoop.fs.s3.Jets3tFileSystemStore.retrieveINode(Jets3tFileSystemStore.java:221)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at
org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:187)
at
org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:102)
at com.sun.proxy.$Proxy17.retrieveINode(Unknown Source)
at org.apache.hadoop.fs.s3.S3FileSystem.getFileStatus(S3FileSystem.java:340)
at org.apache.hadoop.tools.mapred.CopyMapper.map(CopyMapper.java:230)
at org.apache.hadoop.tools.mapred.CopyMapper.map(CopyMapper.java:50)
at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:146)
at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:787)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:341)
at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:164)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:415)
at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1657)
at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:158)
changing the "raise IOE..." to "return null" fixes all of the above code sites
and allows distcp to succeed.
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