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https://issues.apache.org/jira/browse/HADOOP-16356?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Eric Yang resolved HADOOP-16356.
--------------------------------
Resolution: Duplicate
> Distcp with webhdfs is not working with ProxyUserAuthenticationFilter or
> AuthenticationFilter
> ---------------------------------------------------------------------------------------------
>
> Key: HADOOP-16356
> URL: https://issues.apache.org/jira/browse/HADOOP-16356
> Project: Hadoop Common
> Issue Type: Sub-task
> Reporter: Eric Yang
> Assignee: Prabhu Joseph
> Priority: Major
>
> When distcp is running with webhdfs://, there is no delegation token issued
> to mapreduce task because mapreduce task does not have kerberos tgt ticket.
> This stack trace was thrown when mapreduce task contacts webhdfs:
> {code}
> Error: org.apache.hadoop.security.AccessControlException: Authentication
> required
> at
> org.apache.hadoop.hdfs.web.WebHdfsFileSystem.validateResponse(WebHdfsFileSystem.java:492)
> at
> org.apache.hadoop.hdfs.web.WebHdfsFileSystem.access$200(WebHdfsFileSystem.java:136)
> at
> org.apache.hadoop.hdfs.web.WebHdfsFileSystem$AbstractRunner.connect(WebHdfsFileSystem.java:760)
> at
> org.apache.hadoop.hdfs.web.WebHdfsFileSystem$AbstractRunner.runWithRetry(WebHdfsFileSystem.java:835)
> at
> org.apache.hadoop.hdfs.web.WebHdfsFileSystem$AbstractRunner.access$100(WebHdfsFileSystem.java:663)
> at
> org.apache.hadoop.hdfs.web.WebHdfsFileSystem$AbstractRunner$1.run(WebHdfsFileSystem.java:701)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:422)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1891)
> at
> org.apache.hadoop.hdfs.web.WebHdfsFileSystem$AbstractRunner.run(WebHdfsFileSystem.java:697)
> at
> org.apache.hadoop.hdfs.web.WebHdfsFileSystem.getHdfsFileStatus(WebHdfsFileSystem.java:1095)
> at
> org.apache.hadoop.hdfs.web.WebHdfsFileSystem.getFileStatus(WebHdfsFileSystem.java:1106)
> at org.apache.hadoop.tools.mapred.CopyMapper.setup(CopyMapper.java:124)
> at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:143)
> at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:799)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:347)
> at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:178)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:422)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1891)
> at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:172)
> {code}
> There are two proposals:
> 1. Have a API to issue delegation token to pass along to webhdfs to maintain
> backward compatibility.
> 2. Have mapreduce task login to kerberos then perform webhdfs fetching.
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