解决eclipse远程连接MapReduce，提示HADOOP_HOME or hadoop.home.dir are not set.

java.io.IOException: HADOOP_HOME or hadoop.home.dir are not set.

at org.apache.hadoop.util.Shell.checkHadoopHome(Shell.java:302)
at org.apache.hadoop.util.Shell.<clinit>(Shell.java:327)
at org.apache.hadoop.util.GenericOptionsParser.preProcessForWindows(GenericOptionsParser.java:438)
at org.apache.hadoop.util.GenericOptionsParser.parseGeneralOptions(GenericOptionsParser.java:484)
at org.apache.hadoop.util.GenericOptionsParser.<init>(GenericOptionsParser.java:170)
at org.apache.hadoop.util.GenericOptionsParser.<init>(GenericOptionsParser.java:153)
at WordCount.main(WordCount.java:52)
ERROR - Failed to locate the winutils binary in the hadoop binary path
 java.io.IOException: Could not locate executable null\bin\winutils.exe in the Hadoop binaries.
at org.apache.hadoop.util.Shell.getQualifiedBinPath(Shell.java:355)
at org.apache.hadoop.util.Shell.getWinUtilsPath(Shell.java:370)
at org.apache.hadoop.util.Shell.<clinit>(Shell.java:363)
at org.apache.hadoop.util.GenericOptionsParser.preProcessForWindows(GenericOptionsParser.java:438)
at org.apache.hadoop.util.GenericOptionsParser.parseGeneralOptions(GenericOptionsParser.java:484)
at org.apache.hadoop.util.GenericOptionsParser.<init>(GenericOptionsParser.java:170)
at org.apache.hadoop.util.GenericOptionsParser.<init>(GenericOptionsParser.java:153)
at WordCount.main(WordCount.java:52)

解决办法：
在conf对象初始化前添加System.setProperty(“hadoop.home.dir”, “D:\Program Files\hadoop-2.6.4”); 指定hadoop的目录

System.setProperty("hadoop.home.dir", "D:\\Program Files\\hadoop-2.6.4");
Configuration conf = new Configuration();