1、下载hadoop-eclipse-plugin-1.2.1.jar，并将之复制到eclipse/plugins下。

2、打开map-reduce视图

在eclipse中，打开window——>open perspetive——>other，选择map/reduce。

3、选择Map/Reduce Locations标签页，新建一个Location

4、在project exploer中，可以浏览刚才定义站点的文件系统

5、准备测试数据，并上传到hdfs中。

liaoliuqingdeMacBook-Air:Downloads liaoliuqing$ hadoop fs -mkdir in

liaoliuqingdeMacBook-Air:Downloads liaoliuqing$ hadoop fs -copyFromLocal maxTemp.txt in

liaoliuqingdeMacBook-Air:Downloads liaoliuqing$ hadoop fs -ls in

Found 1 items

-rw-r--r--   1 liaoliuqing supergroup        953 2014-12-14 09:47 /user/liaoliuqing/in/maxTemp.txt

其中maxTemp.txt的内容如下：

123456798676231190101234567986762311901012345679867623119010123456798676231190101234561+00121534567890356

123456798676231190101234567986762311901012345679867623119010123456798676231190101234562+01122934567890456

123456798676231190201234567986762311901012345679867623119010123456798676231190101234562+02120234567893456

123456798676231190401234567986762311901012345679867623119010123456798676231190101234561+00321234567803456

123456798676231190101234567986762311902012345679867623119010123456798676231190101234561+00429234567903456

123456798676231190501234567986762311902012345679867623119010123456798676231190101234561+01021134568903456

123456798676231190201234567986762311902012345679867623119010123456798676231190101234561+01124234578903456

123456798676231190301234567986762311905012345679867623119010123456798676231190101234561+04121234678903456

123456798676231190301234567986762311905012345679867623119010123456798676231190101234561+00821235678903456

6、准备map-reduce程序

程序请见http://blog.csdn.net/jediael_lu/article/details/37596469

7、运行程序

MaxTemperature.java——>run as——>run configuration

在arguments中填入输入及输出目录，开始run。

此处是在hdfs中运行程序，事实上也可以在本地文件系统中运行程序，此方法可以方便的用于程序调试。

如在参数中填入：

/Users/liaoliuqing/in   /Users/liaoliuqing/out

即可。

8、以下是eclise console中的输出内容

14/12/14 10:52:05 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable

14/12/14 10:52:05 WARN mapred.JobClient: Use GenericOptionsParser for parsing the arguments. Applications should implement Tool for the same.

14/12/14 10:52:05 WARN mapred.JobClient: No job jar file set.  User classes may not be found. See JobConf(Class) or JobConf#setJar(String).

14/12/14 10:52:05 INFO input.FileInputFormat: Total input paths to process : 1

14/12/14 10:52:05 WARN snappy.LoadSnappy: Snappy native library not loaded

14/12/14 10:52:06 INFO mapred.JobClient: Running job: job_local1815770300_0001

14/12/14 10:52:06 INFO mapred.LocalJobRunner: Waiting for map tasks

14/12/14 10:52:06 INFO mapred.LocalJobRunner: Starting task: attempt_local1815770300_0001_m_000000_0

14/12/14 10:52:06 INFO mapred.Task:  Using ResourceCalculatorPlugin : null

14/12/14 10:52:06 INFO mapred.MapTask: Processing split: hdfs://localhost:9000/user/liaoliuqing/in/maxTemp.txt:0+953

14/12/14 10:52:06 INFO mapred.MapTask: io.sort.mb = 100

14/12/14 10:52:06 INFO mapred.MapTask: data buffer = 79691776/99614720

14/12/14 10:52:06 INFO mapred.MapTask: record buffer = 262144/327680

14/12/14 10:52:06 INFO mapred.MapTask: Starting flush of map output

14/12/14 10:52:06 INFO mapred.MapTask: Finished spill 0

14/12/14 10:52:06 INFO mapred.Task: Task:attempt_local1815770300_0001_m_000000_0 is done. And is in the process of commiting

14/12/14 10:52:06 INFO mapred.LocalJobRunner:

14/12/14 10:52:06 INFO mapred.Task: Task 'attempt_local1815770300_0001_m_000000_0' done.

14/12/14 10:52:06 INFO mapred.LocalJobRunner: Finishing task: attempt_local1815770300_0001_m_000000_0

14/12/14 10:52:06 INFO mapred.LocalJobRunner: Map task executor complete.

14/12/14 10:52:06 INFO mapred.Task:  Using ResourceCalculatorPlugin : null

14/12/14 10:52:06 INFO mapred.LocalJobRunner:

14/12/14 10:52:06 INFO mapred.Merger: Merging 1 sorted segments

14/12/14 10:52:06 INFO mapred.Merger: Down to the last merge-pass, with 1 segments left of total size: 90 bytes

14/12/14 10:52:06 INFO mapred.LocalJobRunner:

14/12/14 10:52:06 INFO mapred.Task: Task:attempt_local1815770300_0001_r_000000_0 is done. And is in the process of commiting

14/12/14 10:52:06 INFO mapred.LocalJobRunner:

14/12/14 10:52:06 INFO mapred.Task: Task attempt_local1815770300_0001_r_000000_0 is allowed to commit now

14/12/14 10:52:06 INFO output.FileOutputCommitter: Saved output of task 'attempt_local1815770300_0001_r_000000_0' to hdfs://localhost:9000/user/liaoliuqing/out

14/12/14 10:52:06 INFO mapred.LocalJobRunner: reduce > reduce

14/12/14 10:52:06 INFO mapred.Task: Task 'attempt_local1815770300_0001_r_000000_0' done.

14/12/14 10:52:07 INFO mapred.JobClient:  map 100% reduce 100%

14/12/14 10:52:07 INFO mapred.JobClient: Job complete: job_local1815770300_0001

14/12/14 10:52:07 INFO mapred.JobClient: Counters: 19

14/12/14 10:52:07 INFO mapred.JobClient:   File Output Format Counters

14/12/14 10:52:07 INFO mapred.JobClient:     Bytes Written=43

14/12/14 10:52:07 INFO mapred.JobClient:   File Input Format Counters

14/12/14 10:52:07 INFO mapred.JobClient:     Bytes Read=953

14/12/14 10:52:07 INFO mapred.JobClient:   FileSystemCounters

14/12/14 10:52:07 INFO mapred.JobClient:     FILE_BYTES_READ=450

14/12/14 10:52:07 INFO mapred.JobClient:     HDFS_BYTES_READ=1906

14/12/14 10:52:07 INFO mapred.JobClient:     FILE_BYTES_WRITTEN=135618

14/12/14 10:52:07 INFO mapred.JobClient:     HDFS_BYTES_WRITTEN=43

14/12/14 10:52:07 INFO mapred.JobClient:   Map-Reduce Framework

14/12/14 10:52:07 INFO mapred.JobClient:     Reduce input groups=5

14/12/14 10:52:07 INFO mapred.JobClient:     Map output materialized bytes=94

14/12/14 10:52:07 INFO mapred.JobClient:     Combine output records=0

14/12/14 10:52:07 INFO mapred.JobClient:     Map input records=9

14/12/14 10:52:07 INFO mapred.JobClient:     Reduce shuffle bytes=0

14/12/14 10:52:07 INFO mapred.JobClient:     Reduce output records=5

14/12/14 10:52:07 INFO mapred.JobClient:     Spilled Records=16

14/12/14 10:52:07 INFO mapred.JobClient:     Map output bytes=72

14/12/14 10:52:07 INFO mapred.JobClient:     Total committed heap usage (bytes)=329252864

14/12/14 10:52:07 INFO mapred.JobClient:     SPLIT_RAW_BYTES=118

14/12/14 10:52:07 INFO mapred.JobClient:     Map output records=8

14/12/14 10:52:07 INFO mapred.JobClient:     Combine input records=0

14/12/14 10:52:07 INFO mapred.JobClient:     Reduce input records=8

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