wordcount
1、创建输入文件目录
在hadoop安装目录下创建wcinput目录，如我的安装目录是：/opt/module/hadoop-2.7.7
[root@hadoop101 hadoop-2.7.7]# pwd
/opt/module/hadoop-2.7.7
[root@hadoop101 hadoop-2.7.7]#
[root@hadoop101 hadoop-2.7.7]#
[root@hadoop101 hadoop-2.7.7]# mkdir wcinput
2、创建数据源
[root@hadoop101 wcinput]# pwd
/opt/module/hadoop-2.7.7/wcinput
[root@hadoop101 wcinput]#
[root@hadoop101 wcinput]#
[root@hadoop101 wcinput]# touch wc.input
3、输入一些数据
[root@hadoop101 wcinput]# cat wc.input
zhangsan lisi wangwu zhaosi
hh
shendu
zhenghui
aiyou
shendu
zhenghui
[root@hadoop101 wcinput]#
[root@hadoop101 wcinput]#
统计数据
hadoop jar share/hadoop/mapreduce/hadoop-mapreduce-examples-2.7.7.jar wordcount wcinput/ wcoutput
[root@hadoop101 ~]# cd /opt/module/hadoop-2.7.7/
[root@hadoop101 hadoop-2.7.7]#
[root@hadoop101 hadoop-2.7.7]# hadoop jar share/hadoop/mapreduce/hadoop-mapreduce-examples-2.7.7.jar wordcount wcinput/ wcoutput
19/10/03 12:46:22 INFO Configuration.deprecation: session.id is deprecated. Instead, use dfs.metrics.session-id
19/10/03 12:46:22 INFO jvm.JvmMetrics: Initializing JVM Metrics with processName=JobTracker, sessionId=
19/10/03 12:46:23 INFO input.FileInputFormat: Total input paths to process : 1
19/10/03 12:46:23 INFO mapreduce.JobSubmitter: number of splits:1
19/10/03 12:46:23 INFO mapreduce.JobSubmitter: Submitting tokens for job: job_local1891222959_0001
19/10/03 12:46:23 INFO mapreduce.Job: The url to track the job: http://localhost:8080/
19/10/03 12:46:23 INFO mapreduce.Job: Running job: job_local1891222959_0001
19/10/03 12:46:23 INFO mapred.LocalJobRunner: OutputCommitter set in config null
19/10/03 12:46:23 INFO output.FileOutputCommitter: File Output Committer Algorithm version is 1
19/10/03 12:46:23 INFO mapred.LocalJobRunner: OutputCommitter is org.apache.hadoop.mapreduce.lib.output.FileOutputCommitter
19/10/03 12:46:23 INFO mapred.LocalJobRunner: Waiting for map tasks
19/10/03 12:46:23 INFO mapred.LocalJobRunner: Starting task: attempt_local1891222959_0001_m_000000_0
19/10/03 12:46:23 INFO output.FileOutputCommitter: File Output Committer Algorithm version is 1
19/10/03 12:46:23 INFO mapred.Task: Using ResourceCalculatorProcessTree : [ ]
19/10/03 12:46:23 INFO mapred.MapTask: Processing split: file:/opt/module/hadoop-2.7.7/wcinput/wc.input:0+69
19/10/03 12:46:23 INFO mapred.MapTask: (EQUATOR) 0 kvi 26214396(104857584)
19/10/03 12:46:23 INFO mapred.MapTask: mapreduce.task.io.sort.mb: 100
19/10/03 12:46:23 INFO mapred.MapTask: soft limit at 83886080
19/10/03 12:46:23 INFO mapred.MapTask: bufstart = 0; bufvoid = 104857600
19/10/03 12:46:23 INFO mapred.MapTask: kvstart = 26214396; length = 6553600
19/10/03 12:46:23 INFO mapred.MapTask: Map output collector class = org.apache.hadoop.mapred.MapTask$MapOutputBuffer
19/10/03 12:46:23 INFO mapred.LocalJobRunner:
19/10/03 12:46:23 INFO mapred.MapTask: Starting flush of map output
19/10/03 12:46:23 INFO mapred.MapTask: Spilling map output
19/10/03 12:46:23 INFO mapred.MapTask: bufstart = 0; bufend = 109; bufvoid = 104857600
19/10/03 12:46:23 INFO mapred.MapTask: kvstart = 26214396(104857584); kvend = 26214360(104857440); length = 37/6553600
19/10/03 12:46:23 INFO mapred.MapTask: Finished spill 0
19/10/03 12:46:23 INFO mapred.Task: Task:attempt_local1891222959_0001_m_000000_0 is done. And is in the process of committing
19/10/03 12:46:23 INFO mapred.LocalJobRunner: map
19/10/03 12:46:23 INFO mapred.Task: Task 'attempt_local1891222959_0001_m_000000_0' done.
19/10/03 12:46:23 INFO mapred.Task: Final Counters for attempt_local1891222959_0001_m_000000_0: Counters: 18
File System Counters
FILE: Number of bytes read=296278
FILE: Number of bytes written=589524
FILE: Number of read operations=0
FILE: Number of large read operations=0
FILE: Number of write operations=0
Map-Reduce Framework
Map input records=7
Map output records=10
Map output bytes=109
Map output materialized bytes=107
Input split bytes=111
Combine input records=10
Combine output records=8
Spilled Records=8
Failed Shuffles=0
Merged Map outputs=0
GC time elapsed (ms)=0
Total committed heap usage (bytes)=197132288
File Input Format Counters
Bytes Read=69
19/10/03 12:46:23 INFO mapred.LocalJobRunner: Finishing task: attempt_local1891222959_0001_m_000000_0
19/10/03 12:46:23 INFO mapred.LocalJobRunner: map task executor complete.
19/10/03 12:46:23 INFO mapred.LocalJobRunner: Waiting for reduce tasks
19/10/03 12:46:23 INFO mapred.LocalJobRunner: Starting task: attempt_local1891222959_0001_r_000000_0
19/10/03 12:46:23 INFO output.FileOutputCommitter: File Output Committer Algorithm version is 1
19/10/03 12:46:23 INFO mapred.Task: Using ResourceCalculatorProcessTree : [ ]
19/10/03 12:46:23 INFO mapred.ReduceTask: Using ShuffleConsumerPlugin: org.apache.hadoop.mapreduce.task.reduce.Shuffle@c5d1342
19/10/03 12:46:23 INFO reduce.MergeManagerImpl: MergerManager: memoryLimit=334338464, maxSingleShuffleLimit=83584616, mergeThreshold=220663392, ioSortFactor=10, memToMemMergeOutputsThreshold=10
19/10/03 12:46:23 INFO reduce.EventFetcher: attempt_local1891222959_0001_r_000000_0 Thread started: EventFetcher for fetching Map Completion Events
19/10/03 12:46:23 INFO reduce.LocalFetcher: localfetcher#1 about to shuffle output of map attempt_local1891222959_0001_m_000000_0 decomp: 103 len: 107 to MEMORY
19/10/03 12:46:23 INFO reduce.InMemoryMapOutput: Read 103 bytes from map-output for attempt_local1891222959_0001_m_000000_0
19/10/03 12:46:23 INFO reduce.MergeManagerImpl: closeInMemoryFile -> map-output of size: 103, inMemoryMapOutputs.size() -> 1, commitMemory -> 0, usedMemory ->103
19/10/03 12:46:23 INFO reduce.EventFetcher: EventFetcher is interrupted.. Returning
19/10/03 12:46:23 INFO mapred.LocalJobRunner: 1 / 1 copied.
19/10/03 12:46:23 INFO reduce.MergeManagerImpl: finalMerge called with 1 in-memory map-outputs and 0 on-disk map-outputs
19/10/03 12:46:23 INFO mapred.Merger: Merging 1 sorted segments
19/10/03 12:46:23 INFO mapred.Merger: Down to the last merge-pass, with 1 segments left of total size: 95 bytes
19/10/03 12:46:23 INFO reduce.MergeManagerImpl: Merged 1 segments, 103 bytes to disk to satisfy reduce memory limit
19/10/03 12:46:23 INFO reduce.MergeManagerImpl: Merging 1 files, 107 bytes from disk
19/10/03 12:46:23 INFO reduce.MergeManagerImpl: Merging 0 segments, 0 bytes from memory into reduce
19/10/03 12:46:23 INFO mapred.Merger: Merging 1 sorted segments
19/10/03 12:46:23 INFO mapred.Merger: Down to the last merge-pass, with 1 segments left of total size: 95 bytes
19/10/03 12:46:23 INFO mapred.LocalJobRunner: 1 / 1 copied.
19/10/03 12:46:23 INFO Configuration.deprecation: mapred.skip.on is deprecated. Instead, use mapreduce.job.skiprecords
19/10/03 12:46:23 INFO mapred.Task: Task:attempt_local1891222959_0001_r_000000_0 is done. And is in the process of committing
19/10/03 12:46:23 INFO mapred.LocalJobRunner: 1 / 1 copied.
19/10/03 12:46:23 INFO mapred.Task: Task attempt_local1891222959_0001_r_000000_0 is allowed to commit now
19/10/03 12:46:23 INFO output.FileOutputCommitter: Saved output of task 'attempt_local1891222959_0001_r_000000_0' to file:/opt/module/hadoop-2.7.7/wcoutput/_temporary/0/task_local1891222959_0001_r_000000
19/10/03 12:46:23 INFO mapred.LocalJobRunner: reduce > reduce
19/10/03 12:46:23 INFO mapred.Task: Task 'attempt_local1891222959_0001_r_000000_0' done.
19/10/03 12:46:23 INFO mapred.Task: Final Counters for attempt_local1891222959_0001_r_000000_0: Counters: 24
File System Counters
FILE: Number of bytes read=296524
FILE: Number of bytes written=589712
FILE: Number of read operations=0
FILE: Number of large read operations=0
FILE: Number of write operations=0
Map-Reduce Framework
Combine input records=0
Combine output records=0
Reduce input groups=8
Reduce shuffle bytes=107
Reduce input records=8
Reduce output records=8
Spilled Records=8
Shuffled Maps =1
Failed Shuffles=0
Merged Map outputs=1
GC time elapsed (ms)=0
Total committed heap usage (bytes)=197132288
Shuffle Errors
BAD_ID=0
CONNECTION=0
IO_ERROR=0
WRONG_LENGTH=0
WRONG_MAP=0
WRONG_REDUCE=0
File Output Format Counters
Bytes Written=81
19/10/03 12:46:23 INFO mapred.LocalJobRunner: Finishing task: attempt_local1891222959_0001_r_000000_0
19/10/03 12:46:23 INFO mapred.LocalJobRunner: reduce task executor complete.
19/10/03 12:46:24 INFO mapreduce.Job: Job job_local1891222959_0001 running in uber mode : false
19/10/03 12:46:24 INFO mapreduce.Job: map 100% reduce 100%
19/10/03 12:46:24 INFO mapreduce.Job: Job job_local1891222959_0001 completed successfully
19/10/03 12:46:24 INFO mapreduce.Job: Counters: 30
File System Counters
FILE: Number of bytes read=592802
FILE: Number of bytes written=1179236
FILE: Number of read operations=0
FILE: Number of large read operations=0
FILE: Number of write operations=0
Map-Reduce Framework
Map input records=7
Map output records=10
Map output bytes=109
Map output materialized bytes=107
Input split bytes=111
Combine input records=10
Combine output records=8
Reduce input groups=8
Reduce shuffle bytes=107
Reduce input records=8
Reduce output records=8
Spilled Records=16
Shuffled Maps =1
Failed Shuffles=0
Merged Map outputs=1
GC time elapsed (ms)=0
Total committed heap usage (bytes)=394264576
Shuffle Errors
BAD_ID=0
CONNECTION=0
IO_ERROR=0
WRONG_LENGTH=0
WRONG_MAP=0
WRONG_REDUCE=0
File Input Format Counters
Bytes Read=69
File Output Format Counters
Bytes Written=81
[root@hadoop101 hadoop-2.7.7]#
查看统计结果
[root@hadoop101 hadoop-2.7.7]# cat wcoutput/part-r-00000
aiyou 1
hh 1
lisi 1
shendu 2
wangwu 1
zhangsan 1
zhaosi 1
zhenghui 2
[root@hadoop101 hadoop-2.7.7]#
[root@hadoop101 hadoop-2.7.7]#
