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From Suresh Srinivas <sur...@hortonworks.com>
Subject Re: compatibility between new client and old server
Date Wed, 18 Dec 2013 18:56:57 GMT
2.x is a new major release. 1.x and 2.x are not compatible.

In 1.x, the RPC wire protocol used java serialization. In 2.x, the RPC wire
protocol uses protobuf. A client must be compiled against 2.x and should
use appropriate jars from 2.x to work with 2.x.


On Wed, Dec 18, 2013 at 10:45 AM, Ken Been <Ken.Been@twosigma.com> wrote:

>  I am trying to make a 2.2.0 Java client work with a 1.1.2 server.  The
> error I am currently getting is below.  I’d like to know if my problem is
> because I have configured something wrong or because the versions are
> simply not compatible for what I want to do.  Thanks in advance for any
> help.
>
>
>
> Ken
>
>
>
>         at org.apache.hadoop.net.NetUtils.wrapException(NetUtils.java:764)
>
>         at org.apache.hadoop.ipc.Client.call(Client.java:1351)
>
>         at org.apache.hadoop.ipc.Client.call(Client.java:1300)
>
>         at
> org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:206)
>
>         at com.sun.proxy.$Proxy18.getFileInfo(Unknown Source)
>
>         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>
>         at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
>
>         at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>
>         at java.lang.reflect.Method.invoke(Method.java:601)
>
>         at
> org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:186)
>
>         at
> org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:102)
>
>         at com.sun.proxy.$Proxy18.getFileInfo(Unknown Source)
>
>         at
> org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.getFileInfo(ClientNamenodeProtocolTranslatorPB.java:651)
>
>         at
> org.apache.hadoop.hdfs.DFSClient.getFileInfo(DFSClient.java:1679)
>
>         at
> org.apache.hadoop.hdfs.DistributedFileSystem$17.doCall(DistributedFileSystem.java:1106)
>
>         at
> org.apache.hadoop.hdfs.DistributedFileSystem$17.doCall(DistributedFileSystem.java:1102)
>
>         at
> org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
>
>        at
> org.apache.hadoop.hdfs.DistributedFileSystem.getFileStatus(DistributedFileSystem.java:1102)
>
>         at my code...
>
> Caused by: java.io.EOFException
>
>         at java.io.DataInputStream.readInt(DataInputStream.java:392)
>
>         at
> org.apache.hadoop.ipc.Client$Connection.receiveRpcResponse(Client.java:995)
>
>         at org.apache.hadoop.ipc.Client$Connection.run(Client.java:891)
>



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