Hadoop installation and configuration in Windows

Http://ebiquity.umbc.edu/Tutorials/Hadoop/00%20-%20Intro.html

It is quite powerful outside China, mainly because it has a detailed picture

 

However, I still encountered some problems, using version 0.20.2.

The following error occurs:

Org. Apache. hadoop. mapreduce. Lib. Input. filesplit cannot be cast to mapred. inputsplit

 

In addition, running with the built-in Eclipse plug-in does not respond at all. I found it on an IBM website and won't use it ..

Http://www.alphaworks.ibm.com/tech/mapreducetools/download

 

It is another problem in Ubuntu. nullpointerexception. I found it and excerpted the following text to answer the question. It has not been resolved. It is generally considered to be a problem of version and hosts settings on the Internet.

 

Have you looked at https://issues.apache.org/jira/browse/MAPREDUCE-969?
It points to https://issues.apache.org/jira/browse/HADOOP-4744
See if the HADOOP-4744 is contained in the hadoop version you're running.
I am reading cdh3b2 source code. Please confirm that * cetask. Java: 2683 * is
This line:
List loc = maplocations. Get (host );
If so, you can print the value of host, or value of Uri U which host is
Derived.
Cheers