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Posted to common-user@hadoop.apache.org by jagaran das <ja...@yahoo.co.in> on 2011/07/31 23:50:54 UTC

DFSClient Protocol and FileSystem class


What is the difference between DFSClient Protocol and FileSystem class in Hadoop DFS (HDFS). Both of these classes are used for connecting a remote client to the namenode in HDFS. So,

 I wanted to know the advantages of one over the other and which one is suitable for remote-client connection.


Regards,
JD

Re: DFSClient Protocol and FileSystem class

Posted by Tsz Wo Sze <sz...@yahoo.com>.

Hi JD,

FileSystem is a public API but DFSClient is an internal class.  For developing Hadoop applications, we should use FileSystem.

Tsz-Wo



________________________________
From: jagaran das <ja...@yahoo.co.in>
To: "common-user@hadoop.apache.org" <co...@hadoop.apache.org>
Sent: Sunday, July 31, 2011 2:50 PM
Subject: DFSClient Protocol and FileSystem class



What is the difference between DFSClient Protocol and FileSystem class in Hadoop DFS (HDFS). Both of these classes are used for connecting a remote client to the namenode in HDFS. So,

 I wanted to know the advantages of one over the other and which one is suitable for remote-client connection.


Regards,
JD

Max Number of Open Connections

Posted by jagaran das <ja...@yahoo.co.in>.


Hi,

What is the max number of open connections to a namenode?

I am using 

            
FSDataOutputStream out = dfs.create(src);

Cheers,
JD