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HDFS, mail # dev - Cannot communicate


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Re: Cannot communicate
rkevinburton@... 2013-04-22, 17:33

I am on a Ubuntu server. When I go to the link you provided there is a
hyperlink for Ubuntu but it seems like it is the main site. I tried
searching for hadoop native but didn't get any useful results. Is there
some other package that I should install using apt-get?

On Mon, Apr 22, 2013 at 12:02 PM, Vinod Kumar Vavilapalli wrote:

  >
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
<http://hadoop.apache.org/docs/stable/native_libraries.html>  
<http://hadoop.apache.org/docs/stable/native_libraries.html>

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

On Apr 22, 2013, at 9:58 AM, [EMAIL PROTECTED]
<javascript:parent.wgMail.openComposeWindow('[EMAIL PROTECTED]')>
 
<javascript:parent.wgMail.openComposeWindow('[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]
>> <javascript:parent.wgMail.openComposeWindow('[EMAIL PROTECTED]')>  
>> <javascript:parent.wgMail.openComposeWindow('[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]
>>> <javascript:parent.wgMail.openComposeWindow('[EMAIL PROTECTED]')>
>>>  
>>> <javascript:parent.wgMail.openComposeWindow('[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?