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https://issues.apache.org/jira/browse/HDFS-6616?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14065382#comment-14065382
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Jing Zhao commented on HDFS-6616:
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bq. We should also change WebHdfsFileSystem to use the exclude datanode feature
so that it will retry will different datanodes.
Yeah, I have the same comment. And the excludedatanodes should only be used by
the internal retry logic in webhdfsfilesystem instead of an external API.
> bestNode shouldn't always return the first DataNode
> ---------------------------------------------------
>
> Key: HDFS-6616
> URL: https://issues.apache.org/jira/browse/HDFS-6616
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: webhdfs
> Reporter: zhaoyunjiong
> Assignee: zhaoyunjiong
> Priority: Minor
> Attachments: HDFS-6616.1.patch, HDFS-6616.patch
>
>
> When we are doing distcp between clusters, job failed:
> 014-06-30 20:56:28,430 INFO org.apache.hadoop.tools.DistCp: FAIL
> part-r-00101.avro : java.net.NoRouteToHostException: No route to host
> at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
> at
> sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
> at
> sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
> at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
> at
> sun.net.www.protocol.http.HttpURLConnection$6.run(HttpURLConnection.java:1491)
> at java.security.AccessController.doPrivileged(Native Method)
> at
> sun.net.www.protocol.http.HttpURLConnection.getChainedException(HttpURLConnection.java:1485)
> at
> sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1139)
> at
> java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:379)
> at org.apache.hadoop.hdfs.HftpFileSystem.open(HftpFileSystem.java:322)
> at org.apache.hadoop.fs.FileSystem.open(FileSystem.java:427)
> at org.apache.hadoop.tools.DistCp$CopyFilesMapper.copy(DistCp.java:419)
> at org.apache.hadoop.tools.DistCp$CopyFilesMapper.map(DistCp.java:547)
> at org.apache.hadoop.tools.DistCp$CopyFilesMapper.map(DistCp.java:314)
> at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:50)
> at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:429)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:365)
> at org.apache.hadoop.mapred.Child$4.run(Child.java:255)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:396)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1232)
> at org.apache.hadoop.mapred.Child.main(Child.java:249)
> The root reason is one of the DataNode can't access from outside, but inside
> cluster, it's health.
> In NamenodeWebHdfsMethods.java:bestNode, it always return the first DataNode,
> so even after the distcp retries, it still failed.
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