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From Robert Evans <ev...@yahoo-inc.com>
Subject Re: Compiling programs with Hadoop 0.21.0
Date Wed, 31 Aug 2011 22:00:56 GMT
You should be able to use hadoop-common-0.21.0.jar for accessing HDFS APIS and use hadoop-mapred.0.21.0.jar
for accessing the mapreduce APIs.  I cannot really comment further on compilation errors without
seeing the code/error messages.

--Bobby Evans

On 8/31/11 4:34 PM, "Arko Provo Mukherjee" <arkoprovomukherjee@gmail.com> wrote:

Hello,

I am trying to learn Hadoop and doing a project on it.

I need to update some files in my project and hence wanted to use version 0.21.0

However, I am confused as to how I can compile my programs on version 0.21.0 as it doesn't
have any hadoop-core-0.21.0.jar file. What option should I have to give in the -classpath
option?
I can see three different JAR files namely hadoop-common-0.21.0.jar, hadoop-hdfs-0.21.0.jar
& hadoop-mapred-0.21.0.jar.

I am getting compilation errors which using the the common jar file.

Also I would like to learn the FileContext Library as the docs that I have read says that
it has a simpler interface than the FileSystem. However, I cannot find any links to some example
code which can help me to grasp the API. Request you to kindly share any link / code snippet
to demonstrate the use of the new API.

Many thanks in advance for your kind response.

Warm regards
Arko


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