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