hadoop 开发&调试
写好的hadoop任务打成jar后，可以在服务器上用命令hadoop jar 提交。但开发阶段总不能一直用这种方式来调试，最好是在本机的ide 上可以直接debug。
如果在wiindow上配置一套开发调试环境，说实话真是觉得很不爽。为了以后方便，整理了一下windows 下hadoop开发环境的配置和调试过程。
首先本地下载一个和服务器相同版本的hadoop安装包。
然后配置一个HADOOPHOME环境变量
还要去网上下载window的工具包，需要有下面两个文件。下载的时候要注意，如果你是安装的32位Jdk 那么下32位的工具包。
把下后的两个文件拷贝到HADOOPHOME bin目录下。
到这里配置还没有完，除了上面几个配置外，不同的场景还需要不同的配置。（我也是很无语）。
为了便于区分，接下来，我将列出本地Hadoop开发调试的四种场景。
1，本机访问Hdfs数据
如果只是访问远程hdfs目录和文件，需要有%HADOOP_HOME%，还有%HADOOP_HOME%\bin\winutils.exe就可以了。
另外运行的时候会有访问权限的问题。主要是纠结hadoop 服务器的用户名和你本地机器用户名不一样。
解决办法有两种
方法1：hdfs-site.xml 加上如下配置，重启。
<property> <name>dfs.permissions</name> <value>false</value> </property>
方法2：加一个环境变量HADOOP_USER_NAME = 你的hadoop用户名。
访问路径的问题：
如果目录不加hdfs:"/user/rihai/logdata/tmp" 默认会访问你本地目录。
如果想访问hdfs 目录则需要在project resource目录下放置core-site.xml。
<?xml version="1.0" encoding="UTF-8"?> <configuration> <property> <name>fs.defaultFS</name> <value>hdfs://master:9000</value> </property> <property> <name>hadoop.tmp.dir</name> <value>/home/rihai/hadoop/tmp</value> </property> </configuration>
或者代码里指定Configuration
conf.set("fs.default.name", "hdfs://master:9000")
2，本机MapReduce，本地目录做数据源
方便说明，写一个简单的例子，我用的IDE是 IntelliJ IDEA，先创建一个Maven project.
pom.xml 配置
?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.rihai.hadoop</groupId> <artifactId>demo</artifactId> <packaging>pom</packaging> <version>1.0-SNAPSHOT</version> <modules> <module>hdfs</module> <module>job</module> </modules> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> </properties> <dependencies> <dependency> <groupId>org.apache.hadoop</groupId> <artifactId>hadoop-client</artifactId> <version>2.6.0</version> </dependency> </project>
代码如下：
1 package com.rihai.hadoop.job; 2 3 import org.apache.hadoop.conf.Configuration; 4 import org.apache.hadoop.fs.FileSystem; 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 import org.apache.hadoop.yarn.util.SystemClock; 15 import org.apache.hadoop.yarn.webapp.ResponseInfo; 16 17 import java.io.IOException; 18 import java.util.StringTokenizer; 19 20 21 /** 22 * Created by rihaizhang on 2016/9/21. 23 */ 24 public class MrDebug { 25 26 /** 27 * mapper 28 */ 29 public static class TokenizerMapper extends Mapper<Object, Text, Text, IntWritable> { 30 31 private final static IntWritable one = new IntWritable(1); 32 private Text word = new Text(); 33 34 @Override 35 public void map(Object key, Text value, Context context) throws IOException, InterruptedException { 36 37 StringTokenizer stk = new StringTokenizer(value.toString()); 38 39 while (stk.hasMoreTokens()) { 40 word.set(stk.nextToken()); 41 context.write(word, one); 42 } 43 } 44 45 } 46 47 /** 48 * reducer 49 */ 50 public static class IntSumReducer extends Reducer<Text, IntWritable, Text, IntWritable> { 51 52 private final static IntWritable sum = new IntWritable(1); 53 54 @Override 55 public void reduce(Text key, Iterable<IntWritable> values, Context context) throws IOException, InterruptedException { 56 57 int temp = 0; 58 for (IntWritable val : values) { 59 temp += val.get(); 60 } 61 sum.set(temp); 62 context.write(key, sum); 63 } 64 } 65 66 private static void deleteOutput(Configuration conf, String path) throws IOException { 67 try( FileSystem fs = FileSystem.get(conf)) { 68 Path outPath = new Path(path); 69 if (fs.exists(outPath)) { 70 boolean delResult = fs.delete(outPath, true); 71 if (delResult) { 72 System.out.println(path + " deleted."); 73 } else { 74 System.out.println(path + " delete failed."); 75 } 76 } 77 } 78 79 } 80 81 public static void main(String[] args) throws IOException, ClassNotFoundException, InterruptedException { 82 83 System.out.println("begin"); 84 Configuration conf = new Configuration(); 85 86 String[] otherArgs = new GenericOptionsParser(conf, args).getRemainingArgs(); 87 88 if (otherArgs.length < 2) { 89 System.err.println("Usage: wordcount <in> [<in>...] <out>"); 90 System.exit(2); 91 } 92 93 deleteOutput(conf,otherArgs[otherArgs.length - 1]); 94 95 Job job = Job.getInstance(conf, "mrdebug"); 96 job.setJarByClass(MrDebug.class); 97 job.setMapperClass(TokenizerMapper.class); 98 job.setCombinerClass(IntSumReducer.class); 99 job.setReducerClass(IntSumReducer.class); 100 job.setOutputKeyClass(Text.class); 101 job.setOutputValueClass(IntWritable.class); 102 103 for (int i = 0; i < otherArgs.length - 1; i++) { 104 FileInputFormat.addInputPath(job, new Path(otherArgs[i])); 105 } 106 FileOutputFormat.setOutputPath(job, new Path(otherArgs[otherArgs.length - 1])); 107 108 System.exit(job.waitForCompletion(true) ? 0 : 1); 109 110 } 111 112 }
在resources 加上Log4j的配置，不然会有警告。
log4j.rootLogger=INFO, stdout log4j.appender.stdout=org.apache.log4j.ConsoleAppender log4j.appender.stdout.layout=org.apache.log4j.PatternLayout log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE
调试前还得PATH环境变量追加;%HADOOP_HOME%\bin，因为要用到上面工具包的两个文件。注意：Ide 需要重启
设置运行参数为本地目录：
然后运行：
D:\Java\jdk1.7.0_65\bin\java -Didea.launcher.port=7533 "-Didea.launcher.bin.path=C:\Program Files (x86)\JetBrains\IntelliJ IDEA 2016.2\bin" -Dfile.encoding=UTF-8 -classpath "D:\Java\jdk1.7.0_65\jre\lib\charsets.jar;D:\Java\jdk1.7.0_65\jre\lib\deploy.jar;D:\Java\jdk1.7.0_65\jre\lib\ext\access-bridge-32.jar;D:\Java\jdk1.7.0_65\jre\lib\ext\dnsns.jar;D:\Java\jdk1.7.0_65\jre\lib\ext\jaccess.jar;D:\Java\jdk1.7.0_65\jre\lib\ext\localedata.jar;D:\Java\jdk1.7.0_65\jre\lib\ext\sunec.jar;D:\Java\jdk1.7.0_65\jre\lib\ext\sunjce_provider.jar;D:\Java\jdk1.7.0_65\jre\lib\ext\sunmscapi.jar;D:\Java\jdk1.7.0_65\jre\lib\ext\sunpkcs11.jar;D:\Java\jdk1.7.0_65\jre\lib\ext\zipfs.jar;D:\Java\jdk1.7.0_65\jre\lib\javaws.jar;D:\Java\jdk1.7.0_65\jre\lib\jce.jar;D:\Java\jdk1.7.0_65\jre\lib\jfr.jar;D:\Java\jdk1.7.0_65\jre\lib\jfxrt.jar;D:\Java\jdk1.7.0_65\jre\lib\jsse.jar;D:\Java\jdk1.7.0_65\jre\lib\management-agent.jar;D:\Java\jdk1.7.0_65\jre\lib\plugin.jar;D:\Java\jdk1.7.0_65\jre\lib\resources.jar;D:\Java\jdk1.7.0_65\jre\lib\rt.jar;D:\IdeaProjects\hadoop-demo\job\target\classes;D:\Java\maven\org\apache\hadoop\hadoop-client\2.6.0\hadoop-client-2.6.0.jar;D:\Java\maven\org\apache\hadoop\hadoop-common\2.6.0\hadoop-common-2.6.0.jar;D:\Java\maven\org\apache\hadoop\hadoop-annotations\2.6.0\hadoop-annotations-2.6.0.jar;D:\Java\maven\com\google\guava\guava\11.0.2\guava-11.0.2.jar;D:\Java\maven\com\google\code\findbugs\jsr305\1.3.9\jsr305-1.3.9.jar;D:\Java\maven\commons-cli\commons-cli\1.2\commons-cli-1.2.jar;D:\Java\maven\org\apache\commons\commons-math3\3.1.1\commons-math3-3.1.1.jar;D:\Java\maven\xmlenc\xmlenc\0.52\xmlenc-0.52.jar;D:\Java\maven\commons-httpclient\commons-httpclient\3.1\commons-httpclient-3.1.jar;D:\Java\maven\commons-logging\commons-logging\1.1.3\commons-logging-1.1.3.jar;D:\Java\maven\commons-codec\commons-codec\1.4\commons-codec-1.4.jar;D:\Java\maven\commons-io\commons-io\2.4\commons-io-2.4.jar;D:\Java\maven\commons-net\commons-net\3.1\commons-net-3.1.jar;D:\Java\maven\commons-collections\commons-collections\3.2.1\commons-collections-3.2.1.jar;D:\Java\maven\log4j\log4j\1.2.17\log4j-1.2.17.jar;D:\Java\maven\commons-lang\commons-lang\2.6\commons-lang-2.6.jar;D:\Java\maven\commons-configuration\commons-configuration\1.6\commons-configuration-1.6.jar;D:\Java\maven\commons-digester\commons-digester\1.8\commons-digester-1.8.jar;D:\Java\maven\commons-beanutils\commons-beanutils\1.7.0\commons-beanutils-1.7.0.jar;D:\Java\maven\commons-beanutils\commons-beanutils-core\1.8.0\commons-beanutils-core-1.8.0.jar;D:\Java\maven\org\slf4j\slf4j-api\1.7.5\slf4j-api-1.7.5.jar;D:\Java\maven\org\slf4j\slf4j-log4j12\1.7.5\slf4j-log4j12-1.7.5.jar;D:\Java\maven\org\codehaus\jackson\jackson-core-asl\1.9.13\jackson-core-asl-1.9.13.jar;D:\Java\maven\org\codehaus\jackson\jackson-mapper-asl\1.9.13\jackson-mapper-asl-1.9.13.jar;D:\Java\maven\org\apache\avro\avro\1.7.4\avro-1.7.4.jar;D:\Java\maven\com\thoughtworks\paranamer\paranamer\2.3\paranamer-2.3.jar;D:\Java\maven\org\xerial\snappy\snappy-java\1.0.4.1\snappy-java-1.0.4.1.jar;D:\Java\maven\org\apache\commons\commons-compress\1.4.1\commons-compress-1.4.1.jar;D:\Java\maven\com\google\protobuf\protobuf-java\2.5.0\protobuf-java-2.5.0.jar;D:\Java\maven\com\google\code\gson\gson\2.2.4\gson-2.2.4.jar;D:\Java\maven\org\apache\hadoop\hadoop-auth\2.6.0\hadoop-auth-2.6.0.jar;D:\Java\maven\org\apache\httpcomponents\httpclient\4.2.5\httpclient-4.2.5.jar;D:\Java\maven\org\apache\httpcomponents\httpcore\4.2.4\httpcore-4.2.4.jar;D:\Java\maven\org\apache\directory\server\apacheds-kerberos-codec\2.0.0-M15\apacheds-kerberos-codec-2.0.0-M15.jar;D:\Java\maven\org\apache\directory\server\apacheds-i18n\2.0.0-M15\apacheds-i18n-2.0.0-M15.jar;D:\Java\maven\org\apache\directory\api\api-asn1-api\1.0.0-M20\api-asn1-api-1.0.0-M20.jar;D:\Java\maven\org\apache\directory\api\api-util\1.0.0-M20\api-util-1.0.0-M20.jar;D:\Java\maven\org\apache\zookeeper\zookeeper\3.4.6\zookeeper-3.4.6.jar;D:\Java\maven\org\apache\curator\curator-framework\2.6.0\curator-framework-2.6.0.jar;D:\Java\maven\org\apache\curator\curator-client\2.6.0\curator-client-2.6.0.jar;D:\Java\maven\org\apache\curator\curator-recipes\2.6.0\curator-recipes-2.6.0.jar;D:\Java\maven\org\htrace\htrace-core\3.0.4\htrace-core-3.0.4.jar;D:\Java\maven\io\netty\netty\3.6.2.Final\netty-3.6.2.Final.jar;D:\Java\maven\org\tukaani\xz\1.0\xz-1.0.jar;D:\Java\maven\org\apache\hadoop\hadoop-hdfs\2.6.0\hadoop-hdfs-2.6.0.jar;D:\Java\maven\org\mortbay\jetty\jetty-util\6.1.26\jetty-util-6.1.26.jar;D:\Java\maven\xerces\xercesImpl\2.9.1\xercesImpl-2.9.1.jar;D:\Java\maven\xml-apis\xml-apis\1.3.04\xml-apis-1.3.04.jar;D:\Java\maven\org\apache\hadoop\hadoop-mapreduce-client-app\2.6.0\hadoop-mapreduce-client-app-2.6.0.jar;D:\Java\maven\org\apache\hadoop\hadoop-mapreduce-client-common\2.6.0\hadoop-mapreduce-client-common-2.6.0.jar;D:\Java\maven\org\apache\hadoop\hadoop-yarn-common\2.6.0\hadoop-yarn-common-2.6.0.jar;D:\Java\maven\org\apache\hadoop\hadoop-yarn-client\2.6.0\hadoop-yarn-client-2.6.0.jar;D:\Java\maven\org\apache\hadoop\hadoop-yarn-api\2.6.0\hadoop-yarn-api-2.6.0.jar;D:\Java\maven\org\apache\hadoop\hadoop-mapreduce-client-core\2.6.0\hadoop-mapreduce-client-core-2.6.0.jar;D:\Java\maven\org\apache\hadoop\hadoop-yarn-server-common\2.6.0\hadoop-yarn-server-common-2.6.0.jar;D:\Java\maven\org\fusesource\leveldbjni\leveldbjni-all\1.8\leveldbjni-all-1.8.jar;D:\Java\maven\org\apache\hadoop\hadoop-mapreduce-client-shuffle\2.6.0\hadoop-mapreduce-client-shuffle-2.6.0.jar;D:\Java\maven\javax\xml\bind\jaxb-api\2.2.2\jaxb-api-2.2.2.jar;D:\Java\maven\javax\xml\stream\stax-api\1.0-2\stax-api-1.0-2.jar;D:\Java\maven\javax\activation\activation\1.1\activation-1.1.jar;D:\Java\maven\javax\servlet\servlet-api\2.5\servlet-api-2.5.jar;D:\Java\maven\com\sun\jersey\jersey-core\1.9\jersey-core-1.9.jar;D:\Java\maven\com\sun\jersey\jersey-client\1.9\jersey-client-1.9.jar;D:\Java\maven\org\codehaus\jackson\jackson-jaxrs\1.9.13\jackson-jaxrs-1.9.13.jar;D:\Java\maven\org\codehaus\jackson\jackson-xc\1.9.13\jackson-xc-1.9.13.jar;D:\Java\maven\org\apache\hadoop\hadoop-mapreduce-client-jobclient\2.6.0\hadoop-mapreduce-client-jobclient-2.6.0.jar;C:\Program Files (x86)\JetBrains\IntelliJ IDEA 2016.2\lib\idea_rt.jar" com.intellij.rt.execution.application.AppMain com.rihai.hadoop.job.MrDebug E:\hello.txt E:\output\ begin E:\output\ deleted. 10:51:04,371 | INFO | main | deprecation | apache.hadoop.conf.Configuration 1049 | session.id is deprecated. Instead, use dfs.metrics.session-id 10:51:04,371 | INFO | main | JvmMetrics | he.hadoop.metrics.jvm.JvmMetrics 76 | Initializing JVM Metrics with processName=JobTracker, sessionId= 10:51:04,465 | WARN | main | JobSubmitter | he.hadoop.mapreduce.JobSubmitter 261 | No job jar file set. User classes may not be found. See Job or Job#setJar(String). 10:51:04,481 | INFO | main | FileInputFormat | reduce.lib.input.FileInputFormat 281 | Total input paths to process : 1 10:51:04,496 | INFO | main | JobSubmitter | he.hadoop.mapreduce.JobSubmitter 494 | number of splits:1 10:51:04,559 | INFO | main | JobSubmitter | he.hadoop.mapreduce.JobSubmitter 583 | Submitting tokens for job: job_local742415139_0001 10:51:04,668 | INFO | main | Job | org.apache.hadoop.mapreduce.Job 1300 | The url to track the job: http://localhost:8080/ 10:51:04,668 | INFO | main | Job | org.apache.hadoop.mapreduce.Job 1345 | Running job: job_local742415139_0001 10:51:04,668 | INFO | Thread-3 | LocalJobRunner | hadoop.mapred.LocalJobRunner$Job 471 | OutputCommitter set in config null 10:51:04,668 | INFO | Thread-3 | LocalJobRunner | hadoop.mapred.LocalJobRunner$Job 489 | OutputCommitter is org.apache.hadoop.mapreduce.lib.output.FileOutputCommitter 10:51:04,699 | INFO | Thread-3 | LocalJobRunner | hadoop.mapred.LocalJobRunner$Job 448 | Waiting for map tasks 10:51:04,699 | INFO | Task Executor #0 | LocalJobRunner | calJobRunner$Job$MapTaskRunnable 224 | Starting task: attempt_local742415139_0001_m_000000_0 10:51:04,715 | INFO | Task Executor #0 | ProcfsBasedProcessTree | yarn.util.ProcfsBasedProcessTree 181 | ProcfsBasedProcessTree currently is supported only on Linux. 10:51:04,731 | INFO | Task Executor #0 | Task | org.apache.hadoop.mapred.Task 587 | Using ResourceCalculatorProcessTree : org.apache.hadoop.yarn.util.WindowsBasedProcessTree@102ead5 10:51:04,746 | INFO | Task Executor #0 | MapTask | org.apache.hadoop.mapred.MapTask 753 | Processing split: file:/E:/hello.txt:0+43 10:51:04,809 | INFO | Task Executor #0 | MapTask | p.mapred.MapTask$MapOutputBuffer 1202 | (EQUATOR) 0 kvi 26214396(104857584) 10:51:04,809 | INFO | Task Executor #0 | MapTask | p.mapred.MapTask$MapOutputBuffer 995 | mapreduce.task.io.sort.mb: 100 10:51:04,809 | INFO | Task Executor #0 | MapTask | p.mapred.MapTask$MapOutputBuffer 996 | soft limit at 83886080 10:51:04,809 | INFO | Task Executor #0 | MapTask | p.mapred.MapTask$MapOutputBuffer 997 | bufstart = 0; bufvoid = 104857600 10:51:04,809 | INFO | Task Executor #0 | MapTask | p.mapred.MapTask$MapOutputBuffer 998 | kvstart = 26214396; length = 6553600 10:51:04,824 | INFO | Task Executor #0 | MapTask | org.apache.hadoop.mapred.MapTask 402 | Map output collector class = org.apache.hadoop.mapred.MapTask$MapOutputBuffer 10:51:04,824 | INFO | Task Executor #0 | LocalJobRunner | hadoop.mapred.LocalJobRunner$Job 591 | 10:51:04,824 | INFO | Task Executor #0 | MapTask | p.mapred.MapTask$MapOutputBuffer 1457 | Starting flush of map output 10:51:04,824 | INFO | Task Executor #0 | MapTask | p.mapred.MapTask$MapOutputBuffer 1475 | Spilling map output 10:51:04,824 | INFO | Task Executor #0 | MapTask | p.mapred.MapTask$MapOutputBuffer 1476 | bufstart = 0; bufend = 70; bufvoid = 104857600 10:51:04,824 | INFO | Task Executor #0 | MapTask | p.mapred.MapTask$MapOutputBuffer 1478 | kvstart = 26214396(104857584); kvend = 26214372(104857488); length = 25/6553600 10:51:04,856 | INFO | Task Executor #0 | MapTask | p.mapred.MapTask$MapOutputBuffer 1660 | Finished spill 0 10:51:04,856 | INFO | Task Executor #0 | Task | org.apache.hadoop.mapred.Task 1001 | Task:attempt_local742415139_0001_m_000000_0 is done. And is in the process of committing 10:51:04,856 | INFO | Task Executor #0 | LocalJobRunner | hadoop.mapred.LocalJobRunner$Job 591 | map 10:51:04,856 | INFO | Task Executor #0 | Task | org.apache.hadoop.mapred.Task 1121 | Task 'attempt_local742415139_0001_m_000000_0' done. 10:51:04,856 | INFO | Task Executor #0 | LocalJobRunner | calJobRunner$Job$MapTaskRunnable 249 | Finishing task: attempt_local742415139_0001_m_000000_0 10:51:04,856 | INFO | Thread-3 | LocalJobRunner | hadoop.mapred.LocalJobRunner$Job 456 | map task executor complete. 10:51:04,856 | INFO | Thread-3 | LocalJobRunner | hadoop.mapred.LocalJobRunner$Job 448 | Waiting for reduce tasks 10:51:04,856 | INFO | pool-3-thread-1 | LocalJobRunner | JobRunner$Job$ReduceTaskRunnable 302 | Starting task: attempt_local742415139_0001_r_000000_0 10:51:04,871 | INFO | pool-3-thread-1 | ProcfsBasedProcessTree | yarn.util.ProcfsBasedProcessTree 181 | ProcfsBasedProcessTree currently is supported only on Linux. 10:51:04,887 | INFO | pool-3-thread-1 | Task | org.apache.hadoop.mapred.Task 587 | Using ResourceCalculatorProcessTree : org.apache.hadoop.yarn.util.WindowsBasedProcessTree@1b77ca0 10:51:04,887 | INFO | pool-3-thread-1 | ReduceTask | .apache.hadoop.mapred.ReduceTask 362 | Using ShuffleConsumerPlugin: org.apache.hadoop.mapreduce.task.reduce.Shuffle@1c17ff9 10:51:04,903 | INFO | pool-3-thread-1 | MergeManagerImpl | uce.task.reduce.MergeManagerImpl 196 | MergerManager: memoryLimit=181665792, maxSingleShuffleLimit=45416448, mergeThreshold=119899424, ioSortFactor=10, memToMemMergeOutputsThreshold=10 10:51:04,903 | INFO | ompletion Events | EventFetcher | preduce.task.reduce.EventFetcher 61 | attempt_local742415139_0001_r_000000_0 Thread started: EventFetcher for fetching Map Completion Events 10:51:04,918 | INFO | localfetcher#1 | LocalFetcher | preduce.task.reduce.LocalFetcher 141 | localfetcher#1 about to shuffle output of map attempt_local742415139_0001_m_000000_0 decomp: 38 len: 42 to MEMORY 10:51:04,934 | INFO | localfetcher#1 | InMemoryMapOutput | ce.task.reduce.InMemoryMapOutput 100 | Read 38 bytes from map-output for attempt_local742415139_0001_m_000000_0 10:51:04,949 | INFO | localfetcher#1 | MergeManagerImpl | uce.task.reduce.MergeManagerImpl 314 | closeInMemoryFile -> map-output of size: 38, inMemoryMapOutputs.size() -> 1, commitMemory -> 0, usedMemory ->38 10:51:04,949 | INFO | ompletion Events | EventFetcher | preduce.task.reduce.EventFetcher 76 | EventFetcher is interrupted.. Returning 10:51:04,949 | INFO | pool-3-thread-1 | LocalJobRunner | hadoop.mapred.LocalJobRunner$Job 591 | 1 / 1 copied. 10:51:04,949 | INFO | pool-3-thread-1 | MergeManagerImpl | uce.task.reduce.MergeManagerImpl 674 | finalMerge called with 1 in-memory map-outputs and 0 on-disk map-outputs 10:51:04,949 | INFO | pool-3-thread-1 | Merger | .hadoop.mapred.Merger$MergeQueue 597 | Merging 1 sorted segments 10:51:04,949 | INFO | pool-3-thread-1 | Merger | .hadoop.mapred.Merger$MergeQueue 696 | Down to the last merge-pass, with 1 segments left of total size: 30 bytes 10:51:04,965 | INFO | pool-3-thread-1 | MergeManagerImpl | uce.task.reduce.MergeManagerImpl 751 | Merged 1 segments, 38 bytes to disk to satisfy reduce memory limit 10:51:04,965 | INFO | pool-3-thread-1 | MergeManagerImpl | uce.task.reduce.MergeManagerImpl 781 | Merging 1 files, 42 bytes from disk 10:51:04,965 | INFO | pool-3-thread-1 | MergeManagerImpl | uce.task.reduce.MergeManagerImpl 796 | Merging 0 segments, 0 bytes from memory into reduce 10:51:04,965 | INFO | pool-3-thread-1 | Merger | .hadoop.mapred.Merger$MergeQueue 597 | Merging 1 sorted segments 10:51:04,965 | INFO | pool-3-thread-1 | Merger | .hadoop.mapred.Merger$MergeQueue 696 | Down to the last merge-pass, with 1 segments left of total size: 30 bytes 10:51:04,965 | INFO | pool-3-thread-1 | LocalJobRunner | hadoop.mapred.LocalJobRunner$Job 591 | 1 / 1 copied. 10:51:04,965 | INFO | pool-3-thread-1 | deprecation | apache.hadoop.conf.Configuration 1049 | mapred.skip.on is deprecated. Instead, use mapreduce.job.skiprecords 10:51:04,965 | INFO | pool-3-thread-1 | Task | org.apache.hadoop.mapred.Task 1001 | Task:attempt_local742415139_0001_r_000000_0 is done. And is in the process of committing 10:51:04,965 | INFO | pool-3-thread-1 | LocalJobRunner | hadoop.mapred.LocalJobRunner$Job 591 | 1 / 1 copied. 10:51:04,965 | INFO | pool-3-thread-1 | Task | org.apache.hadoop.mapred.Task 1162 | Task attempt_local742415139_0001_r_000000_0 is allowed to commit now 10:51:04,965 | INFO | pool-3-thread-1 | FileOutputCommitter | e.lib.output.FileOutputCommitter 439 | Saved output of task 'attempt_local742415139_0001_r_000000_0' to file:/E:/output/_temporary/0/task_local742415139_0001_r_000000 10:51:04,965 | INFO | pool-3-thread-1 | LocalJobRunner | hadoop.mapred.LocalJobRunner$Job 591 | reduce > reduce 10:51:04,965 | INFO | pool-3-thread-1 | Task | org.apache.hadoop.mapred.Task 1121 | Task 'attempt_local742415139_0001_r_000000_0' done. 10:51:04,965 | INFO | pool-3-thread-1 | LocalJobRunner | JobRunner$Job$ReduceTaskRunnable 325 | Finishing task: attempt_local742415139_0001_r_000000_0 10:51:04,965 | INFO | Thread-3 | LocalJobRunner | hadoop.mapred.LocalJobRunner$Job 456 | reduce task executor complete. 10:51:05,668 | INFO | main | Job | org.apache.hadoop.mapreduce.Job 1366 | Job job_local742415139_0001 running in uber mode : false 10:51:05,668 | INFO | main | Job | org.apache.hadoop.mapreduce.Job 1373 | map 100% reduce 100% 10:51:05,668 | INFO | main | Job | org.apache.hadoop.mapreduce.Job 1384 | Job job_local742415139_0001 completed successfully 10:51:05,668 | INFO | main | Job | org.apache.hadoop.mapreduce.Job 1391 | Counters: 33 File System Counters FILE: Number of bytes read=476 FILE: Number of bytes written=508250 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=3 Map output records=7 Map output bytes=70 Map output materialized bytes=42 Input split bytes=83 Combine input records=7 Combine output records=3 Reduce input groups=3 Reduce shuffle bytes=42 Reduce input records=3 Reduce output records=3 Spilled Records=6 Shuffled Maps =1 Failed Shuffles=0 Merged Map outputs=1 GC time elapsed (ms)=28 CPU time spent (ms)=0 Physical memory (bytes) snapshot=0 Virtual memory (bytes) snapshot=0 Total committed heap usage (bytes)=242360320 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=43 File Output Format Counters Bytes Written=36 Process finished with exit code 0
3，本机MapReduce，远程Hdfs目录做数据源
访问的是hdfs的数据，但MapReduce在本机，相当于单机版的MR，这样我信可以直接在Ide 上debug。
代码增加如下配置：
conf.set("fs.default.name", "hdfs://master:9000");
设置运行参数为Hdfs目录：
运行结果：
4，本地提交MapReduce 到远程hadoop 服务器
真正的MapReduce 是一个分布式任务，提交到hadoop集群上，在本地Ide是无法debug的。
代码增加如下配置：
conf.set("fs.default.name", "hdfs://master:9000");
conf.set("mapreduce.framework.name", "yarn");
conf.set("yarn.resourcemanager.hostname", "master");
conf.set("mapreduce.app-submission.cross-platform","true");
conf.set("mapreduce.job.jar", "D:\\IdeaProjects\\hadoop-demo\\job\\target\\demo-job-1.0-SNAPSHOT.jar");
代码还需要指定最终的编译的Jar包地址
运行结果：
查看Job 管理页面 http://192.168.56.101:8088/
可以看到这个Job是直接提交到远程服务器运行的。
总结：弄清楚了上面的各种配置场景之后，我们还可以通过在resource目录增加Hadoop配置文件的方式，来灵活控制我们的调试。
作者:张日海
