hadoop 在windows下安裝配置文章一篇

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

國外的，相當強大，主要是配圖很詳實

 

但是我照著弄還是出了點問題，用的是0.20.2版本

提示CastException:

org.apache.hadoop.mapreduce.lib.input.FileSplit cannot be cast to mapred.InputSplit

 

另外，用內建的eclipse外掛程式運行根本沒反應，用了一個IBM網站找的，又不會用..

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

 

話說在ubuntu下又是另一個問題，NullPointerException，找了下，摘抄一段答疑文字如下，未解決，網上一般認為是版本和hosts的設定問題

 

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 HADOOP-4744 is contained in the hadoop version you're running.
I am reading cdh3b2 source code. Please confirm that *ReduceTask.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