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From <dar...@ontrenet.com>
Subject RE: Is it possible to access the HDFS via Java OUTSIDE the Cluster?
Date Tue, 06 Sep 2011 13:40:30 GMT

Use the Thrift HDFS API.


On Tue, 6 Sep 2011 19:28:07 +0200, "Ralf Heyde" <ralf.heyde@gmx.de> wrote:
> Yeah it works. ... 
> I just copied the core-site.xml and hdfs-site.xml ... This setup does
not
> work.
> After copying the whole hadoop-installation-folder from the master-node
...
> it works.
> 
> Thanks.
> 
> -----Original Message-----
> From: Uma Maheswara Rao G 72686 [mailto:maheswara@huawei.com] 
> Sent: Montag, 5. September 2011 17:04
> To: common-user@hadoop.apache.org
> Subject: Re: Is it possible to access the HDFS via Java OUTSIDE the
> Cluster?
> 
> Hi,
> 
>  It is very much possible. Infact that is the main use case for Hadoop
:-)
> 
>  You need to put the hadoop-hdfs*.jar hdoop-common*.jar's in your class
>  path
> from where you want to run the client program.
> 
> At client node side use the below sample code
>  
>  Configuration conf=new Configuration(); //you can set the required
> configurations here
>  FileSystem fs =new DistributedFileSystem();
>  fs.initialize(new URI(<Name_Node_URL>), conf); 
> 
>  fs.copyToLocal(srcPath, destPath)
>  fs.copyFromLocal(srcPath,destPath)
>  .....etc
>  There are many API exposed in FileSystem.java class. So, you can make
use
> of them.
> 
> 
> Regards,
> Uma
>  
> 
> ----- Original Message -----
> From: Ralf Heyde <ralf.heyde@gmx.de>
> Date: Monday, September 5, 2011 7:59 pm
> Subject: Is it possible to access the HDFS via Java OUTSIDE the Cluster?
> To: common-user@hadoop.apache.org
> 
>> Hello,
>> 
>> 
>> 
>> I have found a HDFSClient which shows me, how to access my HDFS 
>> from inside
>> the cluster (i.e. running on a Node). 
>> 
>> 
>> 
>> My Idea is, that different processes may write 64M Chunks to HDFS from
>> external Sources/Clients.
>> 
>> Is that possible? 
>> 
>> How that can be done? Does anybody have some Example Code?
>> 
>> 
>> 
>> Thanks,
>> 
>> 
>> 
>> Ralf
>> 
>> 
>> 
>>

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