Hadoop 在Windows7操作系统下使用Eclipse来搭建hadoop开发环境

      
    
  网上有一些都是在Linux下使用安装Eclipse来进行hadoop应用开发，但是大部分Java程序员对linux系统不是那么熟悉，所以需要在windows下开发hadoop程序，所以经过试验，总结了下如何在windows下使用Eclipse来开发hadoop程序代码。

 

1、 需要下载hadoop的专门插件jar包

hadoop版本为2.3.0，hadoop集群搭建在centos6x上面，插件包下载地址为：http://download.csdn.net/detail/mchdba/8267181，jar包名字为hadoop-eclipse-plugin-2.3.0，可以适用于hadoop2x系列软件版本。

 

2、 把插件包放到eclipse/plugins目录下

为了以后方便，我这里把尽可能多的jar包都放进来了，如下图所示：

 

 

3、重启eclipse，配置Hadoop installation directory    

     如果插件安装成功，打开Windows—Preferences后，在窗口左侧会有Hadoop Map/Reduce选项，点击此选项，在窗口右侧设置Hadoop安装路径。

 

 

 

 

4、配置Map/Reduce Locations

     打开Windows-->Open Perspective-->Other

 

 

 

选择Map/Reduce，点击OK，在右下方看到有个Map/Reduce Locations的图标，如下图所示：

 

点击Map/Reduce Location选项卡，点击右边小象图标，打开Hadoop Location配置窗口：

输入Location Name，任意名称即可.配置Map/Reduce Master和DFS Mastrer，Host和Port配置成与core-site.xml的设置一致即可。

去找core-site.xml配置：

<property>                                        <name>fs.default.name</name>                                                                        <value>hdfs://name01:9000</value>                                                                                </property>

在界面配置如下：

 

 

点击"Finish"按钮，关闭窗口。点击左侧的DFSLocations—>myhadoop（上一步配置的location name)，如能看到user，表示安装成功，但是进去看到报错信息：Error: Permission denied: user=root,access=READ_EXECUTE,inode="/tmp";hadoop:supergroup:drwx---------，如下图所示：

 

应该是权限问题：把/tmp/目录下面所有的关于hadoop的文件夹设置成hadoop用户所有然后分配授予777权限。

cd /tmp/

chmod 777 /tmp/

chown -R hadoop.hadoop /tmp/hsperfdata_root

之后重新连接打开DFS Locations就显示正常了。

 

Map/Reduce Master (此处为Hadoop集群的Map/Reduce地址，应该和mapred-site.xml中的mapred.job.tracker设置相同) 

 

（1）：点击报错：

An internal error occurred during: "Connecting to DFS hadoopname01".

java.net.UnknownHostException: name01

 

直接在hostname那一栏里面设置ip地址为：192.168.52.128，即可，这样就正常打开了，如下图所示：

 

 

 

5、新建WordCount项目

    File—>Project，选择Map/Reduce Project，输入项目名称WordCount等。

    在WordCount项目里新建class，名称为WordCount，报错代码如下：Invalid Hadoop Runtime specified; please click 'Configure Hadoop install directory' or fill in library location input field，报错原因是目录选择不对，不能选择在跟目录E:hadoop下，换成E:uhadoop就可以了，如下所示：

 

一路下一步过去，点击Finished按钮，完成工程创建，Eclipse控制台下面出现如下信息：

14-12-9 下午04时03分10秒: Eclipse is running in a JRE, but a JDK is required

  Some Maven plugins may not work when importing projects or updating source folders.

14-12-9 下午04时03分13秒: Refreshing [/WordCount/pom.xml]

14-12-9 下午04时03分14秒: Refreshing [/WordCount/pom.xml]

14-12-9 下午04时03分14秒: Refreshing [/WordCount/pom.xml]

14-12-9 下午04时03分14秒: Updating index central|http://repo1.maven.org/maven2

14-12-9 下午04时04分10秒: Updated index for central|http://repo1.maven.org/maven2

 

6， Lib包导入：
需要添加的hadoop相应jar包有：

/hadoop-2.3.0/share/hadoop/common下所有jar包，及里面的lib目录下所有jar包，
/hadoop-2.3.0/share/hadoop/hdfs下所有jar包，不包括里面lib下的jar包，
/hadoop-2.3.0/share/hadoop/mapreduce下所有jar包，不包括里面lib下的jar包，
/hadoop-2.3.0/share/hadoop/yarn下所有jar包，不包括里面lib下的jar包，
大概18个jar包左右。

 

7，Eclipse直接提交mapreduce任务所需要环境配置代码如下所示：

 

1. package wc;
2. import java.io.IOException;
3. import java.util.StringTokenizer;
4. import org.apache.hadoop.conf.Configuration;
5. import org.apache.hadoop.fs.Path;
6. import org.apache.hadoop.io.IntWritable;
7. import org.apache.hadoop.io.Text;
8. import org.apache.hadoop.mapreduce.Job;
9. import org.apache.hadoop.mapreduce.Mapper;
10. import org.apache.hadoop.mapreduce.Reducer;
11. import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
12. import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
13. import org.apache.hadoop.util.GenericOptionsParser;
14.  
15. public class W2 {
16.  
17.     public static class TokenizerMapper extends
18.             Mapper<Object, Text, Text, IntWritable> {
19.         private final static IntWritable one = new IntWritable(1);
20.         private Text word = new Text();
21.         public void map(Object key, Text value, Context context)
22.                 throws IOException, InterruptedException {
23.             StringTokenizer itr = new StringTokenizer(value.toString());
24.             while (itr.hasMoreTokens()) {
25.                 word.set(itr.nextToken());
26.                 context.write(word, one);
27.             }
28.         }
29.     }
30.  
31.     public static class IntSumReducer extends
32.             Reducer<Text, IntWritable, Text, IntWritable> {
33.         private IntWritable result = new IntWritable();
34.         public void reduce(Text key, Iterable<IntWritable> values,
35.                 Context context) throws IOException, InterruptedException {
36.             int sum = 0;
37.             for (IntWritable val : values) {
38.                 sum += val.get();
39.             }
40.             result.set(sum);
41.             context.write(key, result);
42.         }
43.     }
44.  
45.     public static void main(String[] args) throws Exception {
46.  
47.         Configuration conf = new Configuration(); System.setProperty(

 

 

8、运行

 8.1、在HDFS上创建目录input

 [hadoop@name01 hadoop-2.3.0]$ hadoop fs -ls /

[hadoop@name01 hadoop-2.3.0]$  hadoop fs -mkdir input

mkdir: `input': No such file or directory

[hadoop@name01 hadoop-2.3.0]$ PS：fs需要全目录的方式来创建文件夹

如果Apache hadoop版本是0.x 或者1.x,

  bin/hadoop hdfs fs -mkdir -p /in

  bin/hadoop hdfs fs  -put /home/du/input   /in

 

如果Apache hadoop版本是2.x.

  bin/hdfs  dfs  -mkdir -p /in

  bin/hdfs  dfs   -put /home/du/input   /in

 

如果是发行版的hadoop,比如Cloudera CDH,IBM BI,Hortonworks HDP 则第一种命令即可。要注意创建目录的全路径。另外hdfs的根目录是 /

 

 

2、拷贝本地README.txt到HDFS的input里

[hadoop@name01 hadoop-2.3.0]$ find . -name README.txt

./share/doc/hadoop/common/README.txt

[hadoop@name01 ~]$ hadoop fs -copyFromLocal ./src/hadoop-2.3.0/share/doc/hadoop/common/README.txt /data/input

[hadoop@name01 ~]$

 [hadoop@name01 ~]$ hadoop fs -ls /
Found 2 items
drwxr-xr-x   - hadoop supergroup          0 2014-12-15 23:34 /data
-rw-r--r--   3 hadoop supergroup         88 2014-08-26 02:21 /input
You have new mail in /var/spool/mail/root
[hadoop@name01 ~]$
 

3，运行hadoop结束后，查看输出结果
（1），直接在hadoop服务器上面查看
[hadoop@name01 ~]$ hadoop fs -ls /data/
Found 2 items
drwxr-xr-x   - hadoop supergroup          0 2014-12-15 23:29 /data/input
drwxr-xr-x   - hadoop supergroup          0 2014-12-15 23:34 /data/output
[hadoop@name01 ~]$ 

（2），去Eclipse下查看


（3），在控制台上查看信息

<code>2014-12-16 15:34:01,303 INFO?[main]?Configuration.deprecation?(Configuration.java:warnOnceIfDeprecated(996))?-?session.id is deprecated.?Instead,?use dfs.metrics.session-id
2014-12-16 15:34:01,309 INFO?[main]?jvm.JvmMetrics?(JvmMetrics.java:init(76))?-?Initializing JVM Metrics with processName=JobTracker,?sessionId=
2014-12-16 15:34:02,047 INFO?[main]?input.FileInputFormat?(FileInputFormat.java:listStatus(287))?-?Total input paths to process?:?1
2014-12-16 15:34:02,120 INFO?[main]?mapreduce.JobSubmitter?(JobSubmitter.java:submitJobInternal(396))?-?number?of?splits:1
2014-12-16 15:34:02,323 INFO?[main]?mapreduce.JobSubmitter?(JobSubmitter.java:printTokens(479))?-?Submitting tokens?for?job:?job_local1764589720_0001
2014-12-16 15:34:02,367 WARN?[main]?conf.Configuration?(Configuration.java:loadProperty(2345))?-?file:/tmp/hadoop-hadoop/mapred/staging/hadoop1764589720/.staging/job_local1764589720_0001/job.xml:an attempt to override final parameter:?mapreduce.job.end-notification.max.retry.interval;?Ignoring.
2014-12-16 15:34:02,368 WARN?[main]?conf.Configuration?(Configuration.java:loadProperty(2345))?-?file:/tmp/hadoop-hadoop/mapred/staging/hadoop1764589720/.staging/job_local1764589720_0001/job.xml:an attempt to override final parameter:?mapreduce.job.end-notification.max.attempts;?Ignoring.
2014-12-16 15:34:02,682 WARN?[main]?conf.Configuration?(Configuration.java:loadProperty(2345))?-?file:/tmp/hadoop-hadoop/mapred/local/localRunner/hadoop/job_local1764589720_0001/job_local1764589720_0001.xml:an attempt to override final parameter:?mapreduce.job.end-notification.max.retry.interval;?Ignoring.
2014-12-16 15:34:02,682 WARN?[main]?conf.Configuration?(Configuration.java:loadProperty(2345))?-?file:/tmp/hadoop-hadoop/mapred/local/localRunner/hadoop/job_local1764589720_0001/job_local1764589720_0001.xml:an attempt to override final parameter:?mapreduce.job.end-notification.max.attempts;?Ignoring.
2014-12-16 15:34:02,703 INFO?[main]?mapreduce.Job?(Job.java:submit(1289))?-?The url to track the job:?http://localhost:8080/
2014-12-16 15:34:02,704 INFO?[main]?mapreduce.Job?(Job.java:monitorAndPrintJob(1334))?-?Running job:?job_local1764589720_0001
2014-12-16 15:34:02,707 INFO?[Thread-4]?mapred.LocalJobRunner?(LocalJobRunner.java:createOutputCommitter(471))?-?OutputCommitter set?in?config null
2014-12-16 15:34:02,719 INFO?[Thread-4]?mapred.LocalJobRunner?(LocalJobRunner.java:createOutputCommitter(489))?-?OutputCommitter is?org.apache.hadoop.mapreduce.lib.output.FileOutputCommitter
2014-12-16 15:34:02,853 INFO?[Thread-4]?mapred.LocalJobRunner?(LocalJobRunner.java:runTasks(448))?-?Waiting?for?map tasks
2014-12-16 15:34:02,857 INFO?[LocalJobRunner Map Task Executor #0]?mapred.LocalJobRunner?(LocalJobRunner.java:run(224))?-?Starting task:?attempt_local1764589720_0001_m_000000_0
2014-12-16 15:34:02,919 INFO?[LocalJobRunner Map Task Executor #0]?util.ProcfsBasedProcessTree?(ProcfsBasedProcessTree.java:isAvailable(129))?-?ProcfsBasedProcessTree currently is supported only on Linux.
2014-12-16 15:34:03,281 INFO?[LocalJobRunner Map Task Executor #0]?mapred.Task?(Task.java:initialize(581))?-?Using ResourceCalculatorProcessTree?:?org.apache.hadoop.yarn.util.WindowsBasedProcessTree@2e1022ec
2014-12-16 15:34:03,287 INFO?[LocalJobRunner Map Task Executor #0]?mapred.MapTask?(MapTask.java:runNewMapper(733))?-?Processing split:?hdfs://192.168.52.128:9000/data/input/README.txt:0+1366
2014-12-16 15:34:03,304 INFO?[LocalJobRunner Map Task Executor #0]?mapred.MapTask?(MapTask.java:createSortingCollector(388))?-?Map output collector class?=?org.apache.hadoop.mapred.MapTask$MapOutputBuffer
2014-12-16 15:34:03,340 INFO?[LocalJobRunner Map Task Executor #0]?mapred.MapTask?(MapTask.java:setEquator(1181))?-?(EQUATOR)?0 kvi 26214396(104857584)
2014-12-16 15:34:03,341 INFO?[LocalJobRunner Map Task Executor #0]?mapred.MapTask?(MapTask.java:init(975))?-?mapreduce.task.io.sort.mb:?100
2014-12-16 15:34:03,341 INFO?[LocalJobRunner Map Task Executor #0]?mapred.MapTask?(MapTask.java:init(976))?-?soft limit at 83886080
2014-12-16 15:34:03,341 INFO?[LocalJobRunner Map Task Executor #0]?mapred.MapTask?(MapTask.java:init(977))?-?bufstart?=?0;?bufvoid?=?104857600
2014-12-16 15:34:03,341 INFO?[LocalJobRunner Map Task Executor #0]?mapred.MapTask?(MapTask.java:init(978))?-?kvstart?=?26214396;?length?=?6553600
2014-12-16 15:34:03,708 INFO?[main]?mapreduce.Job?(Job.java:monitorAndPrintJob(1355))?-?Job job_local1764589720_0001 running?in?uber mode?:?false
2014-12-16 15:34:03,710 INFO?[main]?mapreduce.Job?(Job.java:monitorAndPrintJob(1362))?-?map 0% reduce 0%
2014-12-16 15:34:04,121 INFO?[LocalJobRunner Map Task Executor #0]?mapred.LocalJobRunner?(LocalJobRunner.java:statusUpdate(591))?-?
2014-12-16 15:34:04,128 INFO?[LocalJobRunner Map Task Executor #0]?mapred.MapTask?(MapTask.java:flush(1435))?-?Starting flush?of?map output
2014-12-16 15:34:04,128 INFO?[LocalJobRunner Map Task Executor #0]?mapred.MapTask?(MapTask.java:flush(1453))?-?Spilling map output
2014-12-16 15:34:04,128 INFO?[LocalJobRunner Map Task Executor #0]?mapred.MapTask?(MapTask.java:flush(1454))?-?bufstart?=?0;?bufend?=?2055;?bufvoid?=?104857600
2014-12-16 15:34:04,128 INFO?[LocalJobRunner Map Task Executor #0]?mapred.MapTask?(MapTask.java:flush(1456))?-?kvstart?=?26214396(104857584);?kvend?=?26213684(104854736);?length?=?713/6553600
2014-12-16 15:34:04,179 INFO?[LocalJobRunner Map Task Executor #0]?mapred.MapTask?(MapTask.java:sortAndSpill(1639))?-?Finished spill 0
2014-12-16 15:34:04,194 INFO?[LocalJobRunner Map Task Executor #0]?mapred.Task?(Task.java:done(995))?-?Task:attempt_local1764589720_0001_m_000000_0 is done.?And?is?in?the process?of?committing
2014-12-16 15:34:04,207 INFO?[LocalJobRunner Map Task Executor #0]?mapred.LocalJobRunner?(LocalJobRunner.java:statusUpdate(591))?-?map
2014-12-16 15:34:04,208 INFO?[LocalJobRunner Map Task Executor #0]?mapred.Task?(Task.java:sendDone(1115))?-?Task 'attempt_local1764589720_0001_m_000000_0'?done.
2014-12-16 15:34:04,208 INFO?[LocalJobRunner Map Task Executor #0]?mapred.LocalJobRunner?(LocalJobRunner.java:run(249))?-?Finishing task:?attempt_local1764589720_0001_m_000000_0
2014-12-16 15:34:04,208 INFO?[Thread-4]?mapred.LocalJobRunner?(LocalJobRunner.java:runTasks(456))?-?map task executor complete.
2014-12-16 15:34:04,211 INFO?[Thread-4]?mapred.LocalJobRunner?(LocalJobRunner.java:runTasks(448))?-?Waiting?for?reduce tasks
2014-12-16 15:34:04,211 INFO?[pool-6-thread-1]?mapred.LocalJobRunner?(LocalJobRunner.java:run(302))?-?Starting task:?attempt_local1764589720_0001_r_000000_0
2014-12-16 15:34:04,221 INFO?[pool-6-thread-1]?util.ProcfsBasedProcessTree?(ProcfsBasedProcessTree.java:isAvailable(129))?-?ProcfsBasedProcessTree currently is supported only on Linux.
2014-12-16 15:34:04,478 INFO?[pool-6-thread-1]?mapred.Task?(Task.java:initialize(581))?-?Using ResourceCalculatorProcessTree?:?org.apache.hadoop.yarn.util.WindowsBasedProcessTree@36154615
2014-12-16 15:34:04,483 INFO?[pool-6-thread-1]?mapred.ReduceTask?(ReduceTask.java:run(362))?-?Using ShuffleConsumerPlugin:?org.apache.hadoop.mapreduce.task.reduce.Shuffle@e2b02a3
2014-12-16 15:34:04,500 INFO?[pool-6-thread-1]?reduce.MergeManagerImpl?(MergeManagerImpl.java:<init>(193))?-?MergerManager:?memoryLimit=949983616,?maxSingleShuffleLimit=237495904,?mergeThreshold=626989184,?ioSortFactor=10,?memToMemMergeOutputsThreshold=10
2014-12-16 15:34:04,503 INFO?[EventFetcher?for?fetching Map Completion Events]?reduce.EventFetcher?(EventFetcher.java:run(61))?-?attempt_local1764589720_0001_r_000000_0 Thread started:?EventFetcher?for?fetching Map Completion Events
2014-12-16 15:34:04,543 INFO?[localfetcher#1]?reduce.LocalFetcher?(LocalFetcher.java:copyMapOutput(140))?-?localfetcher#1 about to shuffle output?ofmap attempt_local1764589720_0001_m_000000_0 decomp:?1832 len:?1836 to MEMORY
2014-12-16 15:34:04,548 INFO?[localfetcher#1]?reduce.InMemoryMapOutput?(InMemoryMapOutput.java:shuffle(100))?-?Read 1832 bytes from map-output?for?attempt_local1764589720_0001_m_000000_0
2014-12-16 15:34:04,553 INFO?[localfetcher#1]?reduce.MergeManagerImpl?(MergeManagerImpl.java:closeInMemoryFile(307))?-?closeInMemoryFile?->?map-output?of?size:?1832,?inMemoryMapOutputs.size()?->?1,?commitMemory?->?0,?usedMemory?->1832
2014-12-16 15:34:04,564 INFO?[EventFetcher?for?fetching Map Completion Events]?reduce.EventFetcher?(EventFetcher.java:run(76))?-?EventFetcher is interrupted..?Returning
2014-12-16 15:34:04,566 INFO?[pool-6-thread-1]?mapred.LocalJobRunner?(LocalJobRunner.java:statusUpdate(591))?-?1 / 1 copied.
2014-12-16 15:34:04,566 INFO?[pool-6-thread-1]?reduce.MergeManagerImpl?(MergeManagerImpl.java:finalMerge(667))?-?finalMerge called with 1?in-memory map-outputs?and?0 on-disk map-outputs
2014-12-16 15:34:04,585 INFO?[pool-6-thread-1]?mapred.Merger?(Merger.java:merge(589))?-?Merging 1 sorted segments
2014-12-16 15:34:04,585 INFO?[pool-6-thread-1]?mapred.Merger?(Merger.java:merge(688))?-?Down to the last merge-pass,?with 1 segments left?of?total?size:?1823 bytes
2014-12-16 15:34:04,605 INFO?[pool-6-thread-1]?reduce.MergeManagerImpl?(MergeManagerImpl.java:finalMerge(742))?-?Merged 1 segments,?1832 bytes to disk to satisfy reduce memory limit
2014-12-16 15:34:04,605 INFO?[pool-6-thread-1]?reduce.MergeManagerImpl?(MergeManagerImpl.java:finalMerge(772))?-?Merging 1 files,?1836 bytes from disk
2014-12-16 15:34:04,606 INFO?[pool-6-thread-1]?reduce.MergeManagerImpl?(MergeManagerImpl.java:finalMerge(787))?-?Merging 0 segments,?0 bytes from memory?into?reduce
2014-12-16 15:34:04,607 INFO?[pool-6-thread-1]?mapred.Merger?(Merger.java:merge(589))?-?Merging 1 sorted segments
2014-12-16 15:34:04,608 INFO?[pool-6-thread-1]?mapred.Merger?(Merger.java:merge(688))?-?Down to the last merge-pass,?with 1 segments left?of?total?size:?1823 bytes
2014-12-16 15:34:04,608 INFO?[pool-6-thread-1]?mapred.LocalJobRunner?(LocalJobRunner.java:statusUpdate(591))?-?1 / 1 copied.
2014-12-16 15:34:04,643 INFO?[pool-6-thread-1]?Configuration.deprecation?(Configuration.java:warnOnceIfDeprecated(996))?-?mapred.skip.on is deprecated.?Instead,?use mapreduce.job.skiprecords
2014-12-16 15:34:04,714 INFO?[main]?mapreduce.Job?(Job.java:monitorAndPrintJob(1362))?-?map 100% reduce 0%
2014-12-16 15:34:04,842 INFO?[pool-6-thread-1]?mapred.Task?(Task.java:done(995))?-?Task:attempt_local1764589720_0001_r_000000_0 is done.?And?is?in?the process?of?committing
2014-12-16 15:34:04,850 INFO?[pool-6-thread-1]?mapred.LocalJobRunner?(LocalJobRunner.java:statusUpdate(591))?-?1 / 1 copied.
2014-12-16 15:34:04,850 INFO?[pool-6-thread-1]?mapred.Task?(Task.java:commit(1156))?-?Task attempt_local1764589720_0001_r_000000_0 is allowed to commit now
2014-12-16 15:34:04,881 INFO?[pool-6-thread-1]?output.FileOutputCommitter?(FileOutputCommitter.java:commitTask(439))?-?Saved output?of?task 'attempt_local1764589720_0001_r_000000_0'?to hdfs://192.168.52.128:9000/data/output/_temporary/0/task_local1764589720_0001_r_000000
2014-12-16 15:34:04,884 INFO?[pool-6-thread-1]?mapred.LocalJobRunner?(LocalJobRunner.java:statusUpdate(591))?-?reduce?>?reduce
2014-12-16 15:34:04,884 INFO?[pool-6-thread-1]?mapred.Task?(Task.java:sendDone(1115))?-?Task 'attempt_local1764589720_0001_r_000000_0'?done.
2014-12-16 15:34:04,885 INFO?[pool-6-thread-1]?mapred.LocalJobRunner?(LocalJobRunner.java:run(325))?-?Finishing task:?attempt_local1764589720_0001_r_000000_0
2014-12-16 15:34:04,885 INFO?[Thread-4]?mapred.LocalJobRunner?(LocalJobRunner.java:runTasks(456))?-?reduce task executor complete.
2014-12-16 15:34:05,714 INFO?[main]?mapreduce.Job?(Job.java:monitorAndPrintJob(1362))?-?map 100% reduce 100%
2014-12-16 15:34:05,714 INFO?[main]?mapreduce.Job?(Job.java:monitorAndPrintJob(1373))?-?Job job_local1764589720_0001 completed successfully
2014-12-16 15:34:05,733 INFO?[main]?mapreduce.Job?(Job.java:monitorAndPrintJob(1380))?-?Counters:?38
????File System Counters
????????FILE:?Number?of?bytes read=34542
????????FILE:?Number?of?bytes written=470650
????????FILE:?Number?of?read operations=0
????????FILE:?Number?of?large read operations=0
????????FILE:?Number?of?write operations=0
????????HDFS:?Number?of?bytes read=2732
????????HDFS:?Number?of?bytes written=1306
????????HDFS:?Number?of?read operations=15
????????HDFS:?Number?of?large read operations=0
????????HDFS:?Number?of?write operations=4
????Map-Reduce Framework
????????Map input records=31
????????Map output records=179
????????Map output bytes=2055
????????Map output materialized bytes=1836
????????Input split bytes=113
????????Combine input records=179
????????Combine output records=131
????????Reduce input groups=131
????????Reduce shuffle bytes=1836
????????Reduce input records=131
????????Reduce output records=131
????????Spilled Records=262
????????Shuffled Maps?=1
????????Failed Shuffles=0
????????Merged Map outputs=1
????????GC time elapsed?(ms)=13
????????CPU time spent?(ms)=0
????????Physical memory?(bytes)?snapshot=0
????????Virtual memory?(bytes)?snapshot=0
????????Total committed heap usage?(bytes)=440664064
????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=1366
????File Output Format Counters?
????????Bytes Written=1306</code>

 

 

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