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HDFS, mail # dev - Cannot communicate


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Re: Cannot communicate
Vinod Kumar Vavilapalli 2013-04-22, 17:02

It means what it says: that hadoop native library isn't available for some reason. See http://hadoop.apache.org/docs/stable/native_libraries.html

Thanks,
+Vinod Kumar Vavilapalli
Hortonworks Inc.
http://hortonworks.com/

On Apr 22, 2013, at 9:58 AM, [EMAIL PROTECTED] wrote:

> I was able to add the appropriate Maven dependencies and it "works". I have one last question on this thread. With the added dependencies I am getting the warning:
>
> 13/04/22 11:53:18 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
> What does this mean? Can it be avoided?
>
> Thanks again.
>
>
> On Mon, Apr 22, 2013 at 11:17 AM, Kevin Burton wrote:
>
>> What dependency for the Maven project should I use?
>>
>> On Apr 22, 2013, at 10:02 AM, Ted Yu <[EMAIL PROTECTED]> wrote:
>>
>>> The exception was due to incompatible RPC versions between Apache maven
>>> artifacts and CDH4.
>>>
>>> I suggest you build the project with same hadoop version as in your cluster.
>>>
>>> On Mon, Apr 22, 2013 at 7:50 AM, Kevin Burton <[EMAIL PROTECTED]>wrote:
>>>
>>>> I am relatively new to Hadoop and am working through a Manning publication
>>>> "Hadoop in Action". One of the first program in the book (page 44) gives me
>>>> a Java exception: org.apache.hadoop.ipc.RemoteException: Server IPC version
>>>> 7 cannot communicate with client version 3.
>>>>
>>>> My Hadoop distribution is CDH4. The Java Maven project takes its
>>>> dependency from Apache. The exception comes from a line involving the
>>>> "Configuration" class.
>>>>
>>>> Any idea on how to avoid this exception?