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https://issues.apache.org/jira/browse/HDFS-13100?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16349804#comment-16349804
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Yongjun Zhang edited comment on HDFS-13100 at 2/2/18 5:17 AM:
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Hi [~kihwal],
Thanks again for your help!
I attached a patch ([~atm] and I worked out), we tested in real cluster. Would
you please help giving a quick review?
Many thanks.
was (Author: yzhangal):
Hi [~kihwal],
Thanks again for your help!
I attached a patch (ATM and I worked out), we tested in real cluster. Would you
please help giving a quick review?
Many thanks.
> Handle IllegalArgumentException in when GETSERVERDEFAULTS is not implemented
> in webhdfs.
> ----------------------------------------------------------------------------------------
>
> Key: HDFS-13100
> URL: https://issues.apache.org/jira/browse/HDFS-13100
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs, webhdfs
> Reporter: Yongjun Zhang
> Assignee: Yongjun Zhang
> Priority: Major
> Attachments: HDFS-13100.001.patch
>
>
> HDFS-12386 added getserverdefaults call to webhdfs, and expect clusters that
> don't support this to throw UnsupportedOperationException. However, we are
> seeing
> {code}
> hadoop distcp -D ipc.client.fallback-to-simple-auth-allowed=true -m 30 -pb
> -update -skipcrccheck webhdfs://<NN1>:<webhdfsPort>/fileX
> hdfs://<NN2>:8020/scale1/fileY
> ...
> 18/01/05 10:57:33 ERROR tools.DistCp: Exception encountered
> org.apache.hadoop.ipc.RemoteException(java.lang.IllegalArgumentException):
> Invalid value for webhdfs parameter "op": No enum constant
> org.apache.hadoop.hdfs.web.resources.GetOpParam.Op.GETSERVERDEFAULTS
> at
> org.apache.hadoop.hdfs.web.JsonUtilClient.toRemoteException(JsonUtilClient.java:80)
> at
> org.apache.hadoop.hdfs.web.WebHdfsFileSystem.validateResponse(WebHdfsFileSystem.java:498)
> at
> org.apache.hadoop.hdfs.web.WebHdfsFileSystem.access$200(WebHdfsFileSystem.java:126)
> at
> org.apache.hadoop.hdfs.web.WebHdfsFileSystem$AbstractRunner.runWithRetry(WebHdfsFileSystem.java:765)
> at
> org.apache.hadoop.hdfs.web.WebHdfsFileSystem$AbstractRunner.access$100(WebHdfsFileSystem.java:606)
> at
> org.apache.hadoop.hdfs.web.WebHdfsFileSystem$AbstractRunner$1.run(WebHdfsFileSystem.java:637)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:422)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1962)
> at
> org.apache.hadoop.hdfs.web.WebHdfsFileSystem$AbstractRunner.run(WebHdfsFileSystem.java:633)
> at
> org.apache.hadoop.hdfs.web.WebHdfsFileSystem.getServerDefaults(WebHdfsFileSystem.java:1807)
> at
> org.apache.hadoop.hdfs.web.WebHdfsFileSystem.getKeyProviderUri(WebHdfsFileSystem.java:1825)
> at
> org.apache.hadoop.hdfs.web.WebHdfsFileSystem.getKeyProvider(WebHdfsFileSystem.java:1836)
> at
> org.apache.hadoop.hdfs.HdfsKMSUtil.addDelegationTokensForKeyProvider(HdfsKMSUtil.java:72)
> at
> org.apache.hadoop.hdfs.web.WebHdfsFileSystem.addDelegationTokens(WebHdfsFileSystem.java:1627)
> at
> org.apache.hadoop.mapreduce.security.TokenCache.obtainTokensForNamenodesInternal(TokenCache.java:139)
> at
> org.apache.hadoop.mapreduce.security.TokenCache.obtainTokensForNamenodesInternal(TokenCache.java:100)
> at
> org.apache.hadoop.mapreduce.security.TokenCache.obtainTokensForNamenodes(TokenCache.java:80)
> at
> org.apache.hadoop.tools.SimpleCopyListing.validatePaths(SimpleCopyListing.java:199)
> at org.apache.hadoop.tools.CopyListing.buildListing(CopyListing.java:85)
> at
> org.apache.hadoop.tools.GlobbedCopyListing.doBuildListing(GlobbedCopyListing.java:89)
> at org.apache.hadoop.tools.CopyListing.buildListing(CopyListing.java:86)
> at
> org.apache.hadoop.tools.DistCp.createInputFileListing(DistCp.java:368)
> at org.apache.hadoop.tools.DistCp.prepareFileListing(DistCp.java:96)
> at org.apache.hadoop.tools.DistCp.createAndSubmitJob(DistCp.java:205)
> at org.apache.hadoop.tools.DistCp.execute(DistCp.java:182)
> at org.apache.hadoop.tools.DistCp.run(DistCp.java:153)
> at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:76)
> at org.apache.hadoop.tools.DistCp.main(DistCp.java:432)
> {code}
> We either need to make the server throw UnsupportedOperationException, or
> make the client to handle IllegalArgumentException. For backward
> compatibility and easier operation in the field, the latter is preferred.
> But we'd better understand why IllegalArgumentException is thrown instead of
> UnsupportedOperationException is thrown.
> The correct way to do is: check if the operation is supported, and throw the
> UnsurportedOperationExcetion if not; then check if parameter is legal, throw
> IllegalArgumentException is it's not legal. We can do that fix as follow-up
> of this jira.
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