at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.apache.hadoop.util.RunJar.main(RunJar.java:160)
解决方法：
hadoop@namenode:~/hadoop-1.2.1$ hadoop dfsadmin -safemode leave
Warning: $HADOOP_HOME is deprecated.
Safe mode is OFF
3.再次测试
hadoop@namenode:~/hadoop-1.2.1$ hadoop jar hadoop-examples-1.2.1.jar wordcount in out
Warning: $HADOOP_HOME is deprecated.
14/09/12 08:48:26 INFO input.FileInputFormat: Total input paths to process : 2
14/09/12 08:48:26 INFO util.NativeCodeLoader: Loaded the native-hadoop library
14/09/12 08:48:26 WARN snappy.LoadSnappy: Snappy native library not loaded
14/09/12 08:48:28 INFO mapred.JobClient: Running job: job_201409120827_0003
14/09/12 08:48:29 INFO mapred.JobClient: map 0% reduce 0%
14/09/12 08:48:47 INFO mapred.JobClient: map 50% reduce 0%
14/09/12 08:48:48 INFO mapred.JobClient: map 100% reduce 0%
14/09/12 08:48:57 INFO mapred.JobClient: map 100% reduce 33%
14/09/12 08:48:59 INFO mapred.JobClient: map 100% reduce 100%
14/09/12 08:49:02 INFO mapred.JobClient: Job complete: job_201409120827_0003
14/09/12 08:49:02 INFO mapred.JobClient: Counters: 30
14/09/12 08:49:02 INFO mapred.JobClient: Job Counters
14/09/12 08:49:02 INFO mapred.JobClient: Launched reduce tasks=1
14/09/12 08:49:02 INFO mapred.JobClient: SLOTS_MILLIS_MAPS=27285
14/09/12 08:49:02 INFO mapred.JobClient: Total time spent by all reduces waiting after reserving slots (ms)=0
14/09/12 08:49:02 INFO mapred.JobClient: Total time spent by all maps waiting after reserving slots (ms)=0
14/09/12 08:49:02 INFO mapred.JobClient: Rack-local map tasks=1
14/09/12 08:49:02 INFO mapred.JobClient: Launched map tasks=2
14/09/12 08:49:02 INFO mapred.JobClient: Data-local map tasks=1
14/09/12 08:49:02 INFO mapred.JobClient: SLOTS_MILLIS_REDUCES=12080
14/09/12 08:49:02 INFO mapred.JobClient: File Output Format Counters
14/09/12 08:49:02 INFO mapred.JobClient: Bytes Written=48
14/09/12 08:49:02 INFO mapred.JobClient: FileSystemCounters
14/09/12 08:49:02 INFO mapred.JobClient: FILE_BYTES_READ=104
14/09/12 08:49:02 INFO mapred.JobClient: HDFS_BYTES_READ=265
14/09/12 08:49:02 INFO mapred.JobClient: FILE_BYTES_WRITTEN=177680
14/09/12 08:49:02 INFO mapred.JobClient: HDFS_BYTES_WRITTEN=48
14/09/12 08:49:02 INFO mapred.JobClient: File Input Format Counters
14/09/12 08:49:02 INFO mapred.JobClient: Bytes Read=45
14/09/12 08:49:02 INFO mapred.JobClient: Map-Reduce Framework
14/09/12 08:49:02 INFO mapred.JobClient: Map output materialized bytes=110
14/09/12 08:49:02 INFO mapred.JobClient: Map input records=2
14/09/12 08:49:02 INFO mapred.JobClient: Reduce shuffle bytes=110
14/09/12 08:49:02 INFO mapred.JobClient: Spilled Records=18
14/09/12 08:49:02 INFO mapred.JobClient: Map output bytes=80
14/09/12 08:49:02 INFO mapred.JobClient: Total committed heap usage (bytes)=248127488
14/09/12 08:49:02 INFO mapred.JobClient: CPU time spent (ms)=8560
14/09/12 08:49:02 INFO mapred.JobClient: Combine input records=9
14/09/12 08:49:02 INFO mapred.JobClient: SPLIT_RAW_BYTES=220
14/09/12 08:49:02 INFO mapred.J