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From "Matthew Paduano (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-12689) S3 filesystem operations stopped working correctly
Date Mon, 04 Jan 2016 23:31:39 GMT
Matthew Paduano created HADOOP-12689:
----------------------------------------

             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:yyy@com.bar.foo/

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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