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https://issues.apache.org/jira/browse/HDFS-3367?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13268341#comment-13268341
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Daryn Sharp commented on HDFS-3367:
-----------------------------------
Is this inconsistent with other filesystems? I think they also use the current
user, but I haven't tested.
> WebHDFS doesn't use the logged in user when opening connections
> ---------------------------------------------------------------
>
> Key: HDFS-3367
> URL: https://issues.apache.org/jira/browse/HDFS-3367
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 1.0.2
> Reporter: Jakob Homan
>
> Something along the lines of
> {noformat}
> UserGroupInformation.loginUserFromKeytab(<blah blah>)
> Filesystem fs = FileSystem.get(new URI("webhdfs://blah"), conf)
> {noformat}
> doesn't work as webhdfs doesn't use the correct context and the user shows up
> to the spnego filter without kerberos credentials:
> {noformat}Exception in thread "main" java.io.IOException: Authentication
> failed,
> url=http://<NN>:50070/webhdfs/v1/?op=GETDELEGATIONTOKEN&user.name=<USER>
> at
> org.apache.hadoop.hdfs.web.WebHdfsFileSystem.getHttpUrlConnection(WebHdfsFileSystem.java:337)
> at
> org.apache.hadoop.hdfs.web.WebHdfsFileSystem.httpConnect(WebHdfsFileSystem.java:347)
> at
> org.apache.hadoop.hdfs.web.WebHdfsFileSystem.run(WebHdfsFileSystem.java:403)
> at
> org.apache.hadoop.hdfs.web.WebHdfsFileSystem.getDelegationToken(WebHdfsFileSystem.java:675)
> at
> org.apache.hadoop.hdfs.web.WebHdfsFileSystem.initDelegationToken(WebHdfsFileSystem.java:176)
> at
> org.apache.hadoop.hdfs.web.WebHdfsFileSystem.initialize(WebHdfsFileSystem.java:160)
> at
> org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:1386)
> ...
> Caused by:
> org.apache.hadoop.security.authentication.client.AuthenticationException:
> GSSException: No valid credentials provided (Mechanism level: Failed to find
> any Kerberos tgt)
> at
> org.apache.hadoop.security.authentication.client.KerberosAuthenticator.doSpnegoSequence(KerberosAuthenticator.java:232)
> at
> org.apache.hadoop.security.authentication.client.KerberosAuthenticator.authenticate(KerberosAuthenticator.java:141)
> at
> org.apache.hadoop.security.authentication.client.AuthenticatedURL.openConnection(AuthenticatedURL.java:217)
> at
> org.apache.hadoop.hdfs.web.WebHdfsFileSystem.getHttpUrlConnection(WebHdfsFileSystem.java:332)
> ... 16 more
> Caused by: GSSException: No valid credentials provided (Mechanism level:
> Failed to find any Kerberos tgt)
> at
> sun.security.jgss.krb5.Krb5InitCredential.getInstance(Krb5InitCredential.java:130)
> ...{noformat}
> Explicitly getting the current user's context via a doAs block works, but
> this should be done by webhdfs.
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