Eric Yang created HADOOP-16356:
----------------------------------
Summary: 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
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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