【3】运行第一个自带的测试用例:计算PI的值 A22811459:/home/longhui/hadoop/hadoop-1.2.1 # hadoop jar hadoop-examples-1.2.1.jar pi 2 5 Number of Maps? = 2 Samples per Map = 5 Wrote input for Map #0 Wrote input for Map #1 Starting Job 16/12/15 14:06:04 INFO mapred.FileInputFormat: Total input paths to process : 2 16/12/15 14:06:04 INFO mapred.JobClient: Running job: job_201612151254_0001 16/12/15 14:06:05 INFO mapred.JobClient:? map 0% reduce 0% 16/12/15 14:06:10 INFO mapred.JobClient:? map 100% reduce 0% 16/12/15 14:06:18 INFO mapred.JobClient:? map 100% reduce 33% 16/12/15 14:06:19 INFO mapred.JobClient:? map 100% reduce 100% 16/12/15 14:06:19 INFO mapred.JobClient: Job complete: job_201612151254_0001 16/12/15 14:06:19 INFO mapred.JobClient: Counters: 30 16/12/15 14:06:19 INFO mapred.JobClient:?? Job Counters 16/12/15 14:06:19 INFO mapred.JobClient:???? Launched reduce tasks=1 16/12/15 14:06:19 INFO mapred.JobClient:???? SLOTS_MILLIS_MAPS=6864 16/12/15 14:06:19 INFO mapred.JobClient:???? Total time spent by all reduces waiting after reserving slots (ms)=0 16/12/15 14:06:19 INFO mapred.JobClient:???? Total time spent by all maps waiting after reserving slots (ms)=0 16/12/15 14:06:19 INFO mapred.JobClient:???? Launched map tasks=2 16/12/15 14:06:19 INFO mapred.JobClient:???? Data-local map tasks=2 16/12/15 14:06:19 INFO mapred.JobClient:???? SLOTS_MILLIS_REDUCES=8661 16/12/15 14:06:19 INFO mapred.JobClient:?? File Input Format Counters 16/12/15 14:06:19 INFO mapred.JobClient:???? Bytes Read=236 16/12/15 14:06:19 INFO mapred.JobClient:?? File Output Format Counters 16/12/15 14:06:19 INFO mapred.JobClient:???? Bytes Written=97 16/12/15 14:06:19 INFO mapred.JobClient:?? FileSystemCounters 16/12/15 14:06:19 INFO mapred.JobClient:???? FILE_BYTES_READ=50 16/12/15 14:06:19 INFO mapred.JobClient:???? HDFS_BYTES_READ=478 16/12/15 14:06:19 INFO mapred.JobClient:???? FILE_BYTES_WRITTEN=160889 16/12/15 14:06:19 INFO mapred.JobClient:???? HDFS_BYTES_WRITTEN=215 16/12/15 14:06:19 INFO mapred.JobClient:?? Map-Reduce Framework 16/12/15 14:06:19 INFO mapred.JobClient:???? Map output materialized bytes=56 16/12/15 14:06:19 INFO mapred.JobClient:???? Map input records=2 16/12/15 14:06:19 INFO mapred.JobClient:???? Reduce shuffle bytes=56 16/12/15 14:06:19 INFO mapred.JobClient:???? Spilled Records=8 16/12/15 14:06:19 INFO mapred.JobClient:???? Map output bytes=36 16/12/15 14:06:19 INFO mapred.JobClient:???? Total committed heap usage (bytes)=377028608 16/12/15 14:06:19 INFO mapred.JobClient:???? CPU time spent (ms)=3100 16/12/15 14:06:19 INFO mapred.JobClient:???? Map input bytes=48 16/12/15 14:06:19 INFO mapred.JobClient:???? SPLIT_RAW_BYTES=242 16/12/15 14:06:19 INFO mapred.JobClient:???? Combine input records=0 16/12/15 14:06:19 INFO mapred.JobClient:???? Reduce input records=4 16/12/15 14:06:19 INFO mapred.JobClient:???? Reduce input groups=4 16/12/15 14:06:19 INFO mapred.JobClient:???? Combine output records=0 16/12/15 14:06:19 INFO mapred.JobClient:???? Physical memory (bytes) snapshot=376963072 16/12/15 14:06:19 INFO mapred.JobClient:???? Reduce output records=0 16/12/15 14:06:19 INFO mapred.JobClient:???? Virtual memory (bytes) snapshot=1132392448 16/12/15 14:06:19 INFO mapred.JobClient:???? Map output records=4 Job Finished in 15.585 seconds Estimated value of Pi is 3.60000000000000000000