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https://issues.apache.org/jira/browse/HDFS-13404?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16440310#comment-16440310
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Takanobu Asanuma commented on HDFS-13404:
-----------------------------------------

Hi, [~szetszwo]. Could you please advise me about WebHDFS?

>From HDFS-13353 and this jira, WebHDFS seems to have a little latency to 
>complete some operations after executing the APIs. Is this the specification 
>of WebHDFS or not desired behavior? I added 
>{{fs.contract.create-visibility-delayed=true}} to the contract of WebHDFS in 
>HDFS-13353. But on second thought, it might be wrong.

> RBF: TestRouterWebHDFSContractAppend.testRenameFileBeingAppended fails
> ----------------------------------------------------------------------
>
>                 Key: HDFS-13404
>                 URL: https://issues.apache.org/jira/browse/HDFS-13404
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Takanobu Asanuma
>            Assignee: Takanobu Asanuma
>            Priority: Major
>         Attachments: detailed_error.log
>
>
> This is reported by [~elgoiri].
> {noformat}
> java.io.FileNotFoundException: 
> Failed to append to non-existent file /test/test/target for client 127.0.0.1
>       at 
> org.apache.hadoop.hdfs.server.namenode.FSDirAppendOp.appendFile(FSDirAppendOp.java:104)
>       at 
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.appendFile(FSNamesystem.java:2621)
>       at 
> org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.append(NameNodeRpcServer.java:805)
>       at 
> org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.append(ClientNamenodeProtocolServerSideTranslatorPB.java:485)
>       at 
> org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:523)
>       at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:991)
>       at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:869)
>       at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:815)
>       at javax.security.auth.Subject.doAs(Subject.java:422)
>       at 
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1682)
>       at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2675)
> ...
>       at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
>       at 
> sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
>       at 
> sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
>       at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
>       at 
> org.apache.hadoop.ipc.RemoteException.instantiateException(RemoteException.java:121)
>       at 
> org.apache.hadoop.ipc.RemoteException.unwrapRemoteException(RemoteException.java:110)
>       at 
> org.apache.hadoop.hdfs.web.WebHdfsFileSystem.toIOException(WebHdfsFileSystem.java:549)
>       at 
> org.apache.hadoop.hdfs.web.WebHdfsFileSystem.validateResponse(WebHdfsFileSystem.java:527)
>       at 
> org.apache.hadoop.hdfs.web.WebHdfsFileSystem.access$200(WebHdfsFileSystem.java:136)
>       at 
> org.apache.hadoop.hdfs.web.WebHdfsFileSystem$FsPathOutputStreamRunner$1.close(WebHdfsFileSystem.java:1013)
>       at 
> org.apache.hadoop.fs.contract.AbstractContractAppendTest.testRenameFileBeingAppended(AbstractContractAppendTest.java:139)
> {noformat}



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