HDP on Windows – Installation Forum

Append Mode Does Not Work ??

  • #44431
    Stephen Bovy

    I am getting an error when trying to use Append Mode. HELP !!

    Open file in append mode:/tmp/appends
    hdfsOpenFile(/tmp/appends): FileSystem#append((Lorg/apache/hadoop/fs/Path;)Lorg/
    apache/hadoop/fs/FSDataOutputStream;) error:
    org.apache.hadoop.ipc.RemoteException: java.io.IOException: Append is not suppor
    ted. Please see the dfs.support.append configuration parameter
    at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.appendFile(FSName
    at org.apache.hadoop.hdfs.server.namenode.NameNode.append(NameNode.java:
    at sun.reflect.GeneratedMethodAccessor21.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:587)
    at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1456)
    at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1452)
    at java.security.AccessController.doPrivileged(Native Method)
    at javax.security.auth.Subject.doAs(Subject.java:396)
    at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInforma
    at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1450)

    at org.apache.hadoop.ipc.Client.call(Client.java:1118)
    at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:229)
    at $Proxy1.append(Unknown Source)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryI
    at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocat
    at $Proxy1.append(Unknown Source)
    at org.apache.hadoop.hdfs.DFSClient.append(DFSClient.java:993)
    at org.apache.hadoop.hdfs.DFSClient.append(DFSClient.java:982)
    at org.apache.hadoop.hdfs.DistributedFileSystem.append(DistributedFileSy
    at org.apache.hadoop.fs.FileSystem.append(FileSystem.java:650)
    Failed to open /tmp/appends for Append/writing!

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  • Author
  • #44836
    Robert Molina

    Hi Stephen,
    Are you using java apis for hdfs? At the moment, append in HDP 1.x for windows is a limitation. This feature is expected for HDP 2.0 for windows.


    Stephen Bovy


    I am working with libhdfs , and I have ported it to compile and run on windows , and I was trying to use the test programs to verify that I did not break anything.

    Thus I was getting the above error when the “append” test was performed.

    I am testing with the 1.1.3 Windows package.

    By googling I discovered how to re-enable the broken “append” support and therefore I was able to successfully complete the test suite.

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