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https://issues.apache.org/jira/browse/HDFS-6776?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14120758#comment-14120758
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Aaron T. Myers commented on HDFS-6776:
--------------------------------------
[~wheat9] - I'm assuming you're saying it's fragile because the latest patch is
parsing some exception text. I agree that that sort of thing is in general
fragile, and should be avoided. However, in this case, the alternative is to
require that the remote cluster have its software upgraded to the newer version
that contains the changed behavior. In my opinion (and, it seems, Tucu's and
Yongjun's, as well) having to do that is so onerous for the operator as to
warrant this (admittedly somewhat hacky) message parsing solution.
Do you have some alternative that will allow for this fixed distcp to work with
a cluster which is not running this change? Because if not, I think we should
go ahead and go with this solution, fragile as it may be, so as to potentially
save users a whole heck of a lot of pain.
> distcp from insecure cluster (source) to secure cluster (destination) doesn't
> work via webhdfs
> ----------------------------------------------------------------------------------------------
>
> Key: HDFS-6776
> URL: https://issues.apache.org/jira/browse/HDFS-6776
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 2.3.0, 2.5.0
> Reporter: Yongjun Zhang
> Assignee: Yongjun Zhang
> Attachments: HDFS-6776.001.patch, HDFS-6776.002.patch,
> HDFS-6776.003.patch, HDFS-6776.004.patch, HDFS-6776.004.patch,
> HDFS-6776.005.patch, HDFS-6776.006.NullToken.patch,
> HDFS-6776.006.NullToken.patch, HDFS-6776.007.patch, HDFS-6776.008.patch,
> HDFS-6776.009.patch, HDFS-6776.010.patch, dummy-token-proxy.js
>
>
> Issuing distcp command at the secure cluster side, trying to copy stuff from
> insecure cluster to secure cluster, and see the following problem:
> {code}
> hadoopuser@yjc5u-1 ~]$ hadoop distcp webhdfs://<insure-cluster>:<port>/tmp
> hdfs://<sure-cluster>:8020/tmp/tmptgt
> 14/07/30 20:06:19 INFO tools.DistCp: Input Options:
> DistCpOptions{atomicCommit=false, syncFolder=false, deleteMissing=false,
> ignoreFailures=false, maxMaps=20, sslConfigurationFile='null',
> copyStrategy='uniformsize', sourceFileListing=null,
> sourcePaths=[webhdfs://<insecure-cluster>:<port>/tmp],
> targetPath=hdfs://<secure-cluster>:8020/tmp/tmptgt, targetPathExists=true}
> 14/07/30 20:06:19 INFO client.RMProxy: Connecting to ResourceManager at
> <secure-clister>:8032
> 14/07/30 20:06:20 WARN ssl.FileBasedKeyStoresFactory: The property
> 'ssl.client.truststore.location' has not been set, no TrustStore will be
> loaded
> 14/07/30 20:06:20 WARN security.UserGroupInformation:
> PriviledgedActionException as:[email protected] (auth:KERBEROS)
> cause:java.io.IOException: Failed to get the token for hadoopuser,
> user=hadoopuser
> 14/07/30 20:06:20 WARN security.UserGroupInformation:
> PriviledgedActionException as:[email protected] (auth:KERBEROS)
> cause:java.io.IOException: Failed to get the token for hadoopuser,
> user=hadoopuser
> 14/07/30 20:06:20 ERROR tools.DistCp: Exception encountered
> java.io.IOException: Failed to get the token for hadoopuser, user=hadoopuser
> at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
> at
> sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
> at
> sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
> at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
> at
> org.apache.hadoop.ipc.RemoteException.instantiateException(RemoteException.java:106)
> at
> org.apache.hadoop.ipc.RemoteException.unwrapRemoteException(RemoteException.java:95)
> at
> org.apache.hadoop.hdfs.web.WebHdfsFileSystem.toIOException(WebHdfsFileSystem.java:365)
> at
> org.apache.hadoop.hdfs.web.WebHdfsFileSystem.access$600(WebHdfsFileSystem.java:84)
> at
> org.apache.hadoop.hdfs.web.WebHdfsFileSystem$AbstractRunner.shouldRetry(WebHdfsFileSystem.java:618)
> at
> org.apache.hadoop.hdfs.web.WebHdfsFileSystem$AbstractRunner.runWithRetry(WebHdfsFileSystem.java:584)
> at
> org.apache.hadoop.hdfs.web.WebHdfsFileSystem$AbstractRunner.access$100(WebHdfsFileSystem.java:438)
> at
> org.apache.hadoop.hdfs.web.WebHdfsFileSystem$AbstractRunner$1.run(WebHdfsFileSystem.java:466)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:415)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1554)
> at
> org.apache.hadoop.hdfs.web.WebHdfsFileSystem$AbstractRunner.run(WebHdfsFileSystem.java:462)
> at
> org.apache.hadoop.hdfs.web.WebHdfsFileSystem.getDelegationToken(WebHdfsFileSystem.java:1132)
> at
> org.apache.hadoop.hdfs.web.WebHdfsFileSystem.getDelegationToken(WebHdfsFileSystem.java:218)
> at
> org.apache.hadoop.hdfs.web.WebHdfsFileSystem.getAuthParameters(WebHdfsFileSystem.java:403)
> at
> org.apache.hadoop.hdfs.web.WebHdfsFileSystem.toUrl(WebHdfsFileSystem.java:424)
> at
> org.apache.hadoop.hdfs.web.WebHdfsFileSystem$AbstractFsPathRunner.getUrl(WebHdfsFileSystem.java:640)
> at
> org.apache.hadoop.hdfs.web.WebHdfsFileSystem$AbstractRunner.runWithRetry(WebHdfsFileSystem.java:565)
> at
> org.apache.hadoop.hdfs.web.WebHdfsFileSystem$AbstractRunner.access$100(WebHdfsFileSystem.java:438)
> at
> org.apache.hadoop.hdfs.web.WebHdfsFileSystem$AbstractRunner$1.run(WebHdfsFileSystem.java:466)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:415)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1554)
> at
> org.apache.hadoop.hdfs.web.WebHdfsFileSystem$AbstractRunner.run(WebHdfsFileSystem.java:462)
> at
> org.apache.hadoop.hdfs.web.WebHdfsFileSystem.getHdfsFileStatus(WebHdfsFileSystem.java:781)
> at
> org.apache.hadoop.hdfs.web.WebHdfsFileSystem.getFileStatus(WebHdfsFileSystem.java:796)
> at org.apache.hadoop.fs.Globber.getFileStatus(Globber.java:57)
> at org.apache.hadoop.fs.Globber.glob(Globber.java:248)
> at org.apache.hadoop.fs.FileSystem.globStatus(FileSystem.java:1623)
> at
> org.apache.hadoop.tools.GlobbedCopyListing.doBuildListing(GlobbedCopyListing.java:77)
> at org.apache.hadoop.tools.CopyListing.buildListing(CopyListing.java:81)
> at
> org.apache.hadoop.tools.DistCp.createInputFileListing(DistCp.java:342)
> at org.apache.hadoop.tools.DistCp.execute(DistCp.java:154)
> at org.apache.hadoop.tools.DistCp.run(DistCp.java:121)
> at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
> at org.apache.hadoop.tools.DistCp.main(DistCp.java:390)
> Caused by: org.apache.hadoop.ipc.RemoteException(java.io.IOException): Failed
> to get the token for hadoopuser, user=hadoopuser
> at
> org.apache.hadoop.hdfs.web.JsonUtil.toRemoteException(JsonUtil.java:159)
> at
> org.apache.hadoop.hdfs.web.WebHdfsFileSystem.validateResponse(WebHdfsFileSystem.java:334)
> at
> org.apache.hadoop.hdfs.web.WebHdfsFileSystem.access$200(WebHdfsFileSystem.java:84)
> at
> org.apache.hadoop.hdfs.web.WebHdfsFileSystem$AbstractRunner.runWithRetry(WebHdfsFileSystem.java:570)
> ... 30 more
> [hadoopuser@yjc5u-1 ~]$
> {code}
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