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:\u\hadoop\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： package wc; import java.io.IOException; import java.util.StringTokenizer; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.fs.Path; import org.apache.hadoop.io.IntWritable; import org.apache.hadoop.io.Text; import org.apache.hadoop.mapreduce.Job; import org.apache.hadoop.mapreduce.Mapper; import org.apache.hadoop.mapreduce.Reducer; import org.apache.hadoop.mapreduce.lib.input.FileInputFormat; import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat; import org.apache.hadoop.util.GenericOptionsParser; public class W2 { public static class TokenizerMapper extends Mapper<Object, Text, Text, IntWritable> { private final static IntWritable one = new IntWritable(1); private Text word = new Text(); public void map(Object key, Text value, Context context) throws IOException, InterruptedException { StringTokenizer itr = new StringTokenizer(value.toString()); while (itr.hasMoreTokens()) { word.set(itr.nextToken()); context.write(word, one); } } } public static class IntSumReducer extends Reducer<Text, IntWritable, Text, IntWritable> { private IntWritable result = new IntWritable(); public void reduce(Text key, Iterable<IntWritable> values, Context context) throws IOException, InterruptedException { int sum = 0; for (IntWritable val : values) { sum += val.get(); } result.set(sum); context.write(key, result); } } public static void main(String[] args) throws Exception { 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 itemsdrwxr-xr-x - hadoop supergroup 0 2014-12-15 23:34 /data-rw-r--r-- 3 hadoop supergroup 88 2014-08-26 02:21 /inputYou 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 itemsdrwxr-xr-x - hadoop supergroup 0 2014-12-15 23:29 /data/inputdrwxr-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 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 of map 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 ----------------------------------------------------------------------------------------------------------------<版权所有，文章允许转载，但必须以链接方式注明源地址，否则追究法律责任!>原博客地址： http://blog.itpub.net/26230597/viewspace-1370205/原作者：黄杉 (mchdba)----------------------------------------------------------------------------------------------------------------
