Steve Loughran created HADOOP-19176:
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             Summary: S3A Xattr headers need hdfs-compatible prefix
                 Key: HADOOP-19176
                 URL: https://issues.apache.org/jira/browse/HADOOP-19176
             Project: Hadoop Common
          Issue Type: Sub-task
          Components: fs/s3
    Affects Versions: 3.3.6, 3.4.0
            Reporter: Steve Loughran


x3a xattr list needs a prefix compatible with hdfs or existing code which tries 
to copy attributes between stores can break

we need a prefix of {user/trusted/security/system/raw}.

now, problem: currently xattrs are used by the magic committer to propagate 
file size progress; renaming the prefix will break existing code. But as it's 
read only we could modify spark to look for both old and new values.

{code}

org.apache.hadoop.HadoopIllegalArgumentException: An XAttr name must be 
prefixed with user/trusted/security/system/raw, followed by a '.'
        at org.apache.hadoop.hdfs.XAttrHelper.buildXAttr(XAttrHelper.java:77) 
        at org.apache.hadoop.hdfs.DFSClient.setXAttr(DFSClient.java:2835) 
        at 
org.apache.hadoop.hdfs.DistributedFileSystem$59.doCall(DistributedFileSystem.java:3106)
 
        at 
org.apache.hadoop.hdfs.DistributedFileSystem$59.doCall(DistributedFileSystem.java:3102)
 
        at 
org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
        at 
org.apache.hadoop.hdfs.DistributedFileSystem.setXAttr(DistributedFileSystem.java:3115)
 
        at org.apache.hadoop.fs.FileSystem.setXAttr(FileSystem.java:3097)

{code}




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