操作系统:CentOS 5.5 Hadoop:hadoop-0.20.203.0 jdk1.7.0_01 namenode主机名:master,namenode的IP:10.10.102.15 datanode主机名:slave1,datanode的IP:10.10.106.8 datanode主机名:slave2,datanode的IP:10.10.106.9 一、hadoop 安装 1、建立用户 useradd...
http://www.srccodes.com/p/article/38/build-install-configure-run-apache-hadoop-2.2.0-microsoft-windows-os...
1 public class GroupComparator implements RawComparatorMyBinaryKey { 2 3 @Override 4 public int compare(MyBinaryKey o1, MyBinaryKey o2) { 5 return o1.toString().compareTo(o2.toString()); 6 } 7 8 @Override 9 public int compare( byte [] b1,...
1 public class TopK extends Configured implements Tool { 2 3 public static class TopKMapper extends MapperObject, Text, NullWritable, LongWritable { 4 5 public static final int K = 100 ; 6 private TreeMapLong, Long tm = new TreeMapLong, Lo...
Following up on my comment, the Javadocs for TaggedInputSplit confirms that you are probably wrongly casting the input split to a FileSplit: /** * An {@link InputSplit} that tags another InputSplit with extra data for use * by {@link Deleg...
1、safemode bin / hadoopfs - put ./ inputinput put : org . apache . hadoop . hdfs . server . namenode . SafeModeException : Cannotcreatedirectory / user / root / input . Namenodeisinsafemode . 解决方法: NameNode在启动的时候首先进入安全模...
1 ############################################ 2 # producer config 3 ############################################ 4 #agent section 5 producer.sources = s 6 producer.channels = c c1 c2 7 producer.sinks = r h es 8 9 #source section 10 produc...
所谓的推测执行,就是当所有task都开始运行之后,Job Tracker会统计所有任务的平均进度,如果某个task所在的task node机器配置比较低或者CPU load很高(原因很多),导致任务执行比总体任务的平均执行要慢,此时Job Tracker会启动一个新的任务(duplicate ta...
Anybody working with Hadoop should have already faced a same common issue: How to add third-party libraries to your MapReduce job. Add libjars option The first solution, maybe the most common one, consists on adding libraries using -libjar...
hadoop 2.x版本 编译: javac -d . -classpath /usr/lib/hadoop/hadoop-common-2.2.0.2.0.6.0-102.jar TestGetPathMark.java (classpath多个jar包用分号分隔 /opt/1.jar:/opt/2.jar) 在com的同级目录上建立manifest.mf 在里面写上Main-Class: com.test.path.m...