Hadoop基础入门以及Hadoop集群搭建

HADOOP

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what is hadoop

Hadoop是用于存储数据和商用硬件集群运行应用程序的开源软件框架，它提供了海量存储任何类型的数据，极大的处理能力和处理几乎无限的并发任务或作业的能力。

What are the benefits of Hadoop

Hadoop博得广大人群眼球的主要原因是它能够存储和处理大两数据的能力，可以支持任何类型的数据，计算快；随着数据量和品种的不断增加，特别是社交媒体和物联网行业，Hadoop是一个重要的考虑因素，其中使用Hadoop的好处如下：

• 计算能力：它的分布式计算模型快速处理大数据，用的越多计算节点，数据的处理能力会更大；

• 灵活性：不同于传统的关系型数据库，你不要存放前必须进行预处理的数据，只要需要使用，可以保存尽可能多的数据，并决定以后怎么使用它，这包括文本、图像和视频的非结构化数据；

• 容错能力：数据和应用程序处理保护，以防止硬件故障，如果一个节点出现故障，作业自动重定向到其他的节点，以确分布式计算不会失败，它会自动存储所有数据的多个副本；

• 低成本：开源框架是免费的，使用商业硬件来存储大量数据；

• 可扩展性：可以轻松简单地通过增加更多的节点增加你的系统。

What components make up Hadoop

• Hadoop Common--其它Hadoop的模块使用的库和工具

• Hadoop Distributed File System (HDFS)--存储在多台计算机的数据，恕不另行组织基于Java的可扩展系统。

• MapReduce--软件编程模型的并行处理大型数据集

• YARN--从分布式应用程序的调度和处理资源请求的资源管理框架。

Other Hadoop-related projects at Apache include:

• Ambari：配置管理和监控的Apache Hadoop集群基于Web的工具，其中包括Hadoop的HDFS，MapReduce的Hadoop的Hive, HCatalog, HBase, ZooKeeper, Oozie, Pig and Sqoop支持，Ambari还提供查看集群运行状态，如热图，并直观地查看MapReduce的Pig和Hive应用非常久远的功能，诊断一个用户友好的方式表现自己的能力特点的仪表板。

• Avro的：数据序列化系统

• Chukwa：用于管理大型分布式系统的数据采集系统。

• HBase的：支持大表结构化数据存储可扩展的分布式数据库。

• Hive：数据仓库基础设施，提供数据汇总和及时查询。

• Mahout：一种可扩展的机器学习和数据挖掘库。

• Pig：并行计算的高级数据流语言和执行框架。

• Spark：Hadoop的数据的快速和通用计算引擎。Spark提供了支持广泛的应用，包括ETL，机器学习，流处理和图形计算的简单和表现的编程模型。

• Tez：广义数据流编程框架，建立在Hadoop的YRAN，它提供了一个强大而灵活的引擎来执行任务的任意DAG来处理批处理和交互式的使用数据情况，TEZ正在通过Hive，pig和Hadoop的生态系统中其他框架，也可以通过其他商业软件（例如：ETL工具）以取代的Hadoop MapReduce的作为底层执行引擎。

• ZooKeeper的：分布式应用的高性能协调服务。

Hadoop集群搭建

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环境准备

1.虚拟服务器环境: (3台相同配置)

[root@webserver ~]# cat /etc/redhat-release 
CentOS release 6.7 (Final)
[root@webserver ~]# uname -r
2.6.32-573.el6.x86_64

2.免密钥配置：

ssh-keygen -t dsa
ssh-copy-id -i .ssh/id_dsa.pub root@localhost(如果ssh不是默认端口需要'-p端口号 用户@主机名或IP')
ssh-copy-id -i .ssh/id_dsa.pub [email protected]
ssh-copy-id -i .ssh/id_dsa.pub [email protected]
ssh-copy-id -i .ssh/id_dsa.pub [email protected]

3.host主机配置：

vim /etc/hosts
172.16.25.82 master
172.16.25.83 slave1
172.16.25.85 slave2
172.16.25.86 slave3

4.jdk环境配置：

cd /home/hadoop/tools
tar xf jdk-8u60-linux-x64.tar.gz -C /usr/local/
ln -s /usr/local/jdk1.8.0HOME=/usr/local/jdk\nexport PATH=$JAVAHOME/jre/lib:$JAVA_HOME/lib/tools.jar' /etc/profile
source /etc/profile
java -version

hadoop安装

1 上传安装包，解压做软链接

[hadoop@master tools]$tar xf hadoop-2.6.0.tar.gz -C /usr/local
[hadoop@master local]$ln -s /usr/local/hadoop-2.6.0 /usr/local/hadoop

2.修改配置文件

环境变量配置

[hadoop@master local]$ sudo vim /etc/profile
export HADOOPHOME=/usr/local/jdk1.8.0HOME=/usr/local/jdk1.8.0_60

主配置文件修改： /usr/local/hadoop/etc/hadoop

[hadoop@master hadoop]$ cat core-site.xml 


fs.default.name
hdfs://master:9000


 io.file.buffer.size
4096


hadoop.tmp.dir
/usr/local/hadoop/tmp



[hadoop@master hadoop]$ cat hdfs-site.xml 


dfs.replication
3


dfs.namenode.name.dir
file:/usr/local/hadoop/dfs/name


dfs.datanode.data.dir
file:/usr/local/hadoop/dfs/data


    dfs.namenode.secondary.http-address
    master:9001
  

  dfs.permissions
  false
  

dfs.webhdfs.enabled
    true



[hadoop@master hadoop]$ cat yarn-site.xml
    


yarn.nodemanager.aux-services
mapreduce_shuffle


yarn.nodemanager.aux-services.mapreduce.shuffle.class
org.apache.hadoop.mapred.ShuffleHandler


yarn.resourcemanager.address
master:8032


yarn.resourcemanager.scheduler.address
master:8030


yarn.resourcemanager.resource-tracker.address
master:8031


yarn.resourcemanager.admin.address
master:8033


yarn.resourcemanager.webapp.address
master:8088



[hadoop@master hadoop]$ cat mapred-site.xml 


mapreduce.framework.name
yarn


mapreduce.jobhistory.address
master:10020


mapreduce.jobhistory.webapp.address
master:19888



[root@master hadoop]# cat slaves 
web01
dbserver01

3.在master上格式化hdfs文件

[root@dbserver ~]# /home/hadoop/hadoop/bin/hdfs namenode -format
16/06/01 13:33:36 INFO namenode.NameNode: STARTUP_MSG: 
/************************************************************
STARTUP_MSG: Starting NameNode
STARTUP_MSG:   host = dbserver/10.0.0.4
STARTUP_MSG:   args = [-format]
STARTUP_MSG:   version = 2.6.0
STARTUP_MSG:   classpath = /home/hadoop/hadoop/etc/hadoop:/home/hadoop/hadoop/share/hadoop/common/lib/jasper-runtime-5.5.23.jar:/home/hadoop/hadoop/share/hadoop/common/lib/gson-2.2.4.jar:/home/hadoop/hadoop/share/hadoop/common/lib/apacheds-kerberos-codec-2.0.0-M15.jar:/home/hadoop/hadoop/share/hadoop/common/lib/jackson-xc-1.9.13.jar:/home/hadoop/hadoop/share/hadoop/common/lib/log4j-1.2.17.jar:/home/hadoop/hadoop/share/hadoop/common/lib/commons-compress-1.4.1.jar:/home/hadoop/hadoop/share/hadoop/common/lib/api-util-1.0.0-M20.jar:/home/hadoop/hadoop/share/hadoop/common/lib/commons-lang-2.6.jar:/home/hadoop/hadoop/share/hadoop/common/lib/junit-4.11.jar:/home/hadoop/hadoop/share/hadoop/common/lib/commons-collections-3.2.1.jar:/home/hadoop/hadoop/share/hadoop/common/lib/protobuf-java-2.5.0.jar:/home/hadoop/hadoop/share/hadoop/common/lib/activation-1.1.jar:/home/hadoop/hadoop/share/hadoop/common/lib/apacheds-i18n-2.0.0-M15.jar:/home/hadoop/hadoop/share/hadoop/common/lib/commons-cli-1.2.jar:/home/hadoop/hadoop/share/hadoop/common/lib/commons-configuration-1.6.jar:/home/hadoop/hadoop/share/hadoop/common/lib/commons-math3-3.1.1.jar:/home/hadoop/hadoop/share/hadoop/common/lib/curator-client-2.6.0.jar:/home/hadoop/hadoop/share/hadoop/common/lib/jetty-6.1.26.jar:/home/hadoop/hadoop/share/hadoop/common/lib/httpcore-4.2.5.jar:/home/hadoop/hadoop/share/hadoop/common/lib/jettison-1.1.jar:/home/hadoop/hadoop/share/hadoop/common/lib/slf4j-log4j12-1.7.5.jar:/home/hadoop/hadoop/share/hadoop/common/lib/commons-digester-1.8.jar:/home/hadoop/hadoop/share/hadoop/common/lib/commons-logging-1.1.3.jar:/home/hadoop/hadoop/share/hadoop/common/lib/jersey-server-1.9.jar:/home/hadoop/hadoop/share/hadoop/common/lib/paranamer-2.3.jar:/home/hadoop/hadoop/share/hadoop/common/lib/avro-1.7.4.jar:/home/hadoop/hadoop/share/hadoop/common/lib/jersey-json-1.9.jar:/home/hadoop/hadoop/share/hadoop/common/lib/jackson-jaxrs-1.9.13.jar:/home/hadoop/hadoop/share/hadoop/common/lib/jackson-core-asl-1.9.13.jar:/home/hadoop/hadoop/share/hadoop/common/lib/httpclient-4.2.5.jar:/home/hadoop/hadoop/share/hadoop/common/lib/commons-httpclient-3.1.jar:/home/hadoop/hadoop/share/hadoop/common/lib/jets3t-0.9.0.jar:/home/hadoop/hadoop/share/hadoop/common/lib/curator-recipes-2.6.0.jar:/home/hadoop/hadoop/share/hadoop/common/lib/jackson-mapper-asl-1.9.13.jar:/home/hadoop/hadoop/share/hadoop/common/lib/xmlenc-0.52.jar:/home/hadoop/hadoop/share/hadoop/common/lib/asm-3.2.jar:/home/hadoop/hadoop/share/hadoop/common/lib/java-xmlbuilder-0.4.jar:/home/hadoop/hadoop/share/hadoop/common/lib/jsp-api-2.1.jar:/home/hadoop/hadoop/share/hadoop/common/lib/hadoop-annotations-2.6.0.jar:/home/hadoop/hadoop/share/hadoop/common/lib/snappy-java-1.0.4.1.jar:/home/hadoop/hadoop/share/hadoop/common/lib/commons-beanutils-core-1.8.0.jar:/home/hadoop/hadoop/share/hadoop/common/lib/jetty-util-6.1.26.jar:/home/hadoop/hadoop/share/hadoop/common/lib/commons-net-3.1.jar:/home/hadoop/hadoop/share/hadoop/common/lib/hadoop-auth-2.6.0.jar:/home/hadoop/hadoop/share/hadoop/common/lib/slf4j-api-1.7.5.jar:/home/hadoop/hadoop/share/hadoop/common/lib/jaxb-api-2.2.2.jar:/home/hadoop/hadoop/share/hadoop/common/lib/jsch-0.1.42.jar:/home/hadoop/hadoop/share/hadoop/common/lib/netty-3.6.2.Final.jar:/home/hadoop/hadoop/share/hadoop/common/lib/guava-11.0.2.jar:/home/hadoop/hadoop/share/hadoop/common/lib/servlet-api-2.5.jar:/home/hadoop/hadoop/share/hadoop/common/lib/commons-io-2.4.jar:/home/hadoop/hadoop/share/hadoop/common/lib/commons-beanutils-1.7.0.jar:/home/hadoop/hadoop/share/hadoop/common/lib/api-asn1-api-1.0.0-M20.jar:/home/hadoop/hadoop/share/hadoop/common/lib/curator-framework-2.6.0.jar:/home/hadoop/hadoop/share/hadoop/common/lib/jasper-compiler-5.5.23.jar:/home/hadoop/hadoop/share/hadoop/common/lib/hamcrest-core-1.3.jar:/home/hadoop/hadoop/share/hadoop/common/lib/zookeeper-3.4.6.jar:/home/hadoop/hadoop/share/hadoop/common/lib/xz-1.0.jar:/home/hadoop/hadoop/share/hadoop/common/lib/stax-api-1.0-2.jar:/home/hadoop/hadoop/share/hadoop/common/lib/mockito-all-1.8.5.jar:/home/hadoop/hadoop/share/hadoop/common/lib/jersey-core-1.9.jar:/home/hadoop/hadoop/share/hadoop/common/lib/commons-codec-1.4.jar:/home/hadoop/hadoop/share/hadoop/common/lib/htrace-core-3.0.4.jar:/home/hadoop/hadoop/share/hadoop/common/lib/jaxb-impl-2.2.3-1.jar:/home/hadoop/hadoop/share/hadoop/common/lib/jsr305-1.3.9.jar:/home/hadoop/hadoop/share/hadoop/common/lib/commons-el-1.0.jar:/home/hadoop/hadoop/share/hadoop/common/hadoop-nfs-2.6.0.jar:/home/hadoop/hadoop/share/hadoop/common/hadoop-common-2.6.0-tests.jar:/home/hadoop/hadoop/share/hadoop/common/hadoop-common-2.6.0.jar:/home/hadoop/hadoop/share/hadoop/hdfs:/home/hadoop/hadoop/share/hadoop/hdfs/lib/jasper-runtime-5.5.23.jar:/home/hadoop/hadoop/share/hadoop/hdfs/lib/log4j-1.2.17.jar:/home/hadoop/hadoop/share/hadoop/hdfs/lib/commons-lang-2.6.jar:/home/hadoop/hadoop/share/hadoop/hdfs/lib/protobuf-java-2.5.0.jar:/home/hadoop/hadoop/share/hadoop/hdfs/lib/commons-cli-1.2.jar:/home/hadoop/hadoop/share/hadoop/hdfs/lib/jetty-6.1.26.jar:/home/hadoop/hadoop/share/hadoop/hdfs/lib/commons-logging-1.1.3.jar:/home/hadoop/hadoop/share/hadoop/hdfs/lib/jersey-server-1.9.jar:/home/hadoop/hadoop/share/hadoop/hdfs/lib/xml-apis-1.3.04.jar:/home/hadoop/hadoop/share/hadoop/hdfs/lib/jackson-core-asl-1.9.13.jar:/home/hadoop/hadoop/share/hadoop/hdfs/lib/jackson-mapper-asl-1.9.13.jar:/home/hadoop/hadoop/share/hadoop/hdfs/lib/xmlenc-0.52.jar:/home/hadoop/hadoop/share/hadoop/hdfs/lib/asm-3.2.jar:/home/hadoop/hadoop/share/hadoop/hdfs/lib/jsp-api-2.1.jar:/home/hadoop/hadoop/share/hadoop/hdfs/lib/xercesImpl-2.9.1.jar:/home/hadoop/hadoop/share/hadoop/hdfs/lib/jetty-util-6.1.26.jar:/home/hadoop/hadoop/share/hadoop/hdfs/lib/commons-daemon-1.0.13.jar:/home/hadoop/hadoop/share/hadoop/hdfs/lib/netty-3.6.2.Final.jar:/home/hadoop/hadoop/share/hadoop/hdfs/lib/guava-11.0.2.jar:/home/hadoop/hadoop/share/hadoop/hdfs/lib/servlet-api-2.5.jar:/home/hadoop/hadoop/share/hadoop/hdfs/lib/commons-io-2.4.jar:/home/hadoop/hadoop/share/hadoop/hdfs/lib/jersey-core-1.9.jar:/home/hadoop/hadoop/share/hadoop/hdfs/lib/commons-codec-1.4.jar:/home/hadoop/hadoop/share/hadoop/hdfs/lib/htrace-core-3.0.4.jar:/home/hadoop/hadoop/share/hadoop/hdfs/lib/jsr305-1.3.9.jar:/home/hadoop/hadoop/share/hadoop/hdfs/lib/commons-el-1.0.jar:/home/hadoop/hadoop/share/hadoop/hdfs/hadoop-hdfs-2.6.0.jar:/home/hadoop/hadoop/share/hadoop/hdfs/hadoop-hdfs-nfs-2.6.0.jar:/home/hadoop/hadoop/share/hadoop/hdfs/hadoop-hdfs-2.6.0-tests.jar:/home/hadoop/hadoop/share/hadoop/yarn/lib/guice-servlet-3.0.jar:/home/hadoop/hadoop/share/hadoop/yarn/lib/jackson-xc-1.9.13.jar:/home/hadoop/hadoop/share/hadoop/yarn/lib/log4j-1.2.17.jar:/home/hadoop/hadoop/share/hadoop/yarn/lib/commons-compress-1.4.1.jar:/home/hadoop/hadoop/share/hadoop/yarn/lib/commons-lang-2.6.jar:/home/hadoop/hadoop/share/hadoop/yarn/lib/commons-collections-3.2.1.jar:/home/hadoop/hadoop/share/hadoop/yarn/lib/protobuf-java-2.5.0.jar:/home/hadoop/hadoop/share/hadoop/yarn/lib/activation-1.1.jar:/home/hadoop/hadoop/share/hadoop/yarn/lib/commons-cli-1.2.jar:/home/hadoop/hadoop/share/hadoop/yarn/lib/leveldbjni-all-1.8.jar:/home/hadoop/hadoop/share/hadoop/yarn/lib/jetty-6.1.26.jar:/home/hadoop/hadoop/share/hadoop/yarn/lib/jettison-1.1.jar:/home/hadoop/hadoop/share/hadoop/yarn/lib/commons-logging-1.1.3.jar:/home/hadoop/hadoop/share/hadoop/yarn/lib/jersey-server-1.9.jar:/home/hadoop/hadoop/share/hadoop/yarn/lib/jersey-guice-1.9.jar:/home/hadoop/hadoop/share/hadoop/yarn/lib/jersey-json-1.9.jar:/home/hadoop/hadoop/share/hadoop/yarn/lib/jackson-jaxrs-1.9.13.jar:/home/hadoop/hadoop/share/hadoop/yarn/lib/jackson-core-asl-1.9.13.jar:/home/hadoop/hadoop/share/hadoop/yarn/lib/commons-httpclient-3.1.jar:/home/hadoop/hadoop/share/hadoop/yarn/lib/aopalliance-1.0.jar:/home/hadoop/hadoop/share/hadoop/yarn/lib/guice-3.0.jar:/home/hadoop/hadoop/share/hadoop/yarn/lib/jackson-mapper-asl-1.9.13.jar:/home/hadoop/hadoop/share/hadoop/yarn/lib/asm-3.2.jar:/home/hadoop/hadoop/share/hadoop/yarn/lib/jetty-util-6.1.26.jar:/home/hadoop/hadoop/share/hadoop/yarn/lib/javax.inject-1.jar:/home/hadoop/hadoop/share/hadoop/yarn/lib/jaxb-api-2.2.2.jar:/home/hadoop/hadoop/share/hadoop/yarn/lib/jline-0.9.94.jar:/home/hadoop/hadoop/share/hadoop/yarn/lib/netty-3.6.2.Final.jar:/home/hadoop/hadoop/share/hadoop/yarn/lib/guava-11.0.2.jar:/home/hadoop/hadoop/share/hadoop/yarn/lib/servlet-api-2.5.jar:/home/hadoop/hadoop/share/hadoop/yarn/lib/commons-io-2.4.jar:/home/hadoop/hadoop/share/hadoop/yarn/lib/zookeeper-3.4.6.jar:/home/hadoop/hadoop/share/hadoop/yarn/lib/xz-1.0.jar:/home/hadoop/hadoop/share/hadoop/yarn/lib/stax-api-1.0-2.jar:/home/hadoop/hadoop/share/hadoop/yarn/lib/jersey-core-1.9.jar:/home/hadoop/hadoop/share/hadoop/yarn/lib/commons-codec-1.4.jar:/home/hadoop/hadoop/share/hadoop/yarn/lib/jaxb-impl-2.2.3-1.jar:/home/hadoop/hadoop/share/hadoop/yarn/lib/jersey-client-1.9.jar:/home/hadoop/hadoop/share/hadoop/yarn/lib/jsr305-1.3.9.jar:/home/hadoop/hadoop/share/hadoop/yarn/hadoop-yarn-server-common-2.6.0.jar:/home/hadoop/hadoop/share/hadoop/yarn/hadoop-yarn-server-tests-2.6.0.jar:/home/hadoop/hadoop/share/hadoop/yarn/hadoop-yarn-common-2.6.0.jar:/home/hadoop/hadoop/share/hadoop/yarn/hadoop-yarn-client-2.6.0.jar:/home/hadoop/hadoop/share/hadoop/yarn/hadoop-yarn-server-nodemanager-2.6.0.jar:/home/hadoop/hadoop/share/hadoop/yarn/hadoop-yarn-server-resourcemanager-2.6.0.jar:/home/hadoop/hadoop/share/hadoop/yarn/hadoop-yarn-api-2.6.0.jar:/home/hadoop/hadoop/share/hadoop/yarn/hadoop-yarn-applications-distributedshell-2.6.0.jar:/home/hadoop/hadoop/share/hadoop/yarn/hadoop-yarn-server-applicationhistoryservice-2.6.0.jar:/home/hadoop/hadoop/share/hadoop/yarn/hadoop-yarn-applications-unmanaged-am-launcher-2.6.0.jar:/home/hadoop/hadoop/share/hadoop/yarn/hadoop-yarn-registry-2.6.0.jar:/home/hadoop/hadoop/share/hadoop/yarn/hadoop-yarn-server-web-proxy-2.6.0.jar:/home/hadoop/hadoop/share/hadoop/mapreduce/lib/guice-servlet-3.0.jar:/home/hadoop/hadoop/share/hadoop/mapreduce/lib/log4j-1.2.17.jar:/home/hadoop/hadoop/share/hadoop/mapreduce/lib/commons-compress-1.4.1.jar:/home/hadoop/hadoop/share/hadoop/mapreduce/lib/junit-4.11.jar:/home/hadoop/hadoop/share/hadoop/mapreduce/lib/protobuf-java-2.5.0.jar:/home/hadoop/hadoop/share/hadoop/mapreduce/lib/leveldbjni-all-1.8.jar:/home/hadoop/hadoop/share/hadoop/mapreduce/lib/jersey-server-1.9.jar:/home/hadoop/hadoop/share/hadoop/mapreduce/lib/paranamer-2.3.jar:/home/hadoop/hadoop/share/hadoop/mapreduce/lib/jersey-guice-1.9.jar:/home/hadoop/hadoop/share/hadoop/mapreduce/lib/avro-1.7.4.jar:/home/hadoop/hadoop/share/hadoop/mapreduce/lib/jackson-core-asl-1.9.13.jar:/home/hadoop/hadoop/share/hadoop/mapreduce/lib/aopalliance-1.0.jar:/home/hadoop/hadoop/share/hadoop/mapreduce/lib/guice-3.0.jar:/home/hadoop/hadoop/share/hadoop/mapreduce/lib/jackson-mapper-asl-1.9.13.jar:/home/hadoop/hadoop/share/hadoop/mapreduce/lib/asm-3.2.jar:/home/hadoop/hadoop/share/hadoop/mapreduce/lib/hadoop-annotations-2.6.0.jar:/home/hadoop/hadoop/share/hadoop/mapreduce/lib/snappy-java-1.0.4.1.jar:/home/hadoop/hadoop/share/hadoop/mapreduce/lib/javax.inject-1.jar:/home/hadoop/hadoop/share/hadoop/mapreduce/lib/netty-3.6.2.Final.jar:/home/hadoop/hadoop/share/hadoop/mapreduce/lib/commons-io-2.4.jar:/home/hadoop/hadoop/share/hadoop/mapreduce/lib/hamcrest-core-1.3.jar:/home/hadoop/hadoop/share/hadoop/mapreduce/lib/xz-1.0.jar:/home/hadoop/hadoop/share/hadoop/mapreduce/lib/jersey-core-1.9.jar:/home/hadoop/hadoop/share/hadoop/mapreduce/hadoop-mapreduce-client-jobclient-2.6.0-tests.jar:/home/hadoop/hadoop/share/hadoop/mapreduce/hadoop-mapreduce-client-common-2.6.0.jar:/home/hadoop/hadoop/share/hadoop/mapreduce/hadoop-mapreduce-client-hs-2.6.0.jar:/home/hadoop/hadoop/share/hadoop/mapreduce/hadoop-mapreduce-client-core-2.6.0.jar:/home/hadoop/hadoop/share/hadoop/mapreduce/hadoop-mapreduce-client-hs-plugins-2.6.0.jar:/home/hadoop/hadoop/share/hadoop/mapreduce/hadoop-mapreduce-client-shuffle-2.6.0.jar:/home/hadoop/hadoop/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.6.0.jar:/home/hadoop/hadoop/share/hadoop/mapreduce/hadoop-mapreduce-client-app-2.6.0.jar:/home/hadoop/hadoop/share/hadoop/mapreduce/hadoop-mapreduce-client-jobclient-2.6.0.jar:/contrib/capacity-scheduler/*.jar
STARTUP_MSG:   build = https://git-wip-us.apache.org/repos/asf/hadoop.git -r e3496499ecb8d220fba99dc5ed4c99c8f9e33bb1; compiled by 'jenkins' on 2014-11-13T21:10Z
STARTUP_MSG:   java = 1.8.0_60
************************************************************/
16/06/01 13:33:36 INFO namenode.NameNode: registered UNIX signal handlers for [TERM, HUP, INT]
16/06/01 13:33:36 INFO namenode.NameNode: createNameNode [-format]
16/06/01 13:33:36 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
Formatting using clusterid: CID-06b119b1-d2d3-40f1-a04e-69e3a4e13526
16/06/01 13:33:36 INFO namenode.FSNamesystem: No KeyProvider found.
16/06/01 13:33:36 INFO namenode.FSNamesystem: fsLock is fair:true
16/06/01 13:33:36 INFO blockmanagement.DatanodeManager: dfs.block.invalidate.limit=1000
16/06/01 13:33:36 INFO blockmanagement.DatanodeManager: dfs.namenode.datanode.registration.ip-hostname-check=true
16/06/01 13:33:36 INFO blockmanagement.BlockManager: dfs.namenode.startup.delay.block.deletion.sec is set to 000:00:00:00.000
16/06/01 13:33:36 INFO blockmanagement.BlockManager: The block deletion will start around 2016 Jun 01 13:33:36
16/06/01 13:33:36 INFO util.GSet: Computing capacity for map BlocksMap
16/06/01 13:33:36 INFO util.GSet: VM type       = 64-bit
16/06/01 13:33:36 INFO util.GSet: 2.0% max memory 966.7 MB = 19.3 MB
16/06/01 13:33:36 INFO util.GSet: capacity      = 2^21 = 2097152 entries
16/06/01 13:33:36 INFO blockmanagement.BlockManager: dfs.block.access.token.enable=false
16/06/01 13:33:36 INFO blockmanagement.BlockManager: defaultReplication         = 2
16/06/01 13:33:36 INFO blockmanagement.BlockManager: maxReplication             = 512
16/06/01 13:33:36 INFO blockmanagement.BlockManager: minReplication             = 1
16/06/01 13:33:36 INFO blockmanagement.BlockManager: maxReplicationStreams      = 2
16/06/01 13:33:36 INFO blockmanagement.BlockManager: shouldCheckForEnoughRacks  = false
16/06/01 13:33:36 INFO blockmanagement.BlockManager: replicationRecheckInterval = 3000
16/06/01 13:33:36 INFO blockmanagement.BlockManager: encryptDataTransfer        = false
16/06/01 13:33:36 INFO blockmanagement.BlockManager: maxNumBlocksToLog          = 1000
16/06/01 13:33:36 INFO namenode.FSNamesystem: fsOwner             = root (auth:SIMPLE)
16/06/01 13:33:36 INFO namenode.FSNamesystem: supergroup          = supergroup
16/06/01 13:33:36 INFO namenode.FSNamesystem: isPermissionEnabled = false
16/06/01 13:33:36 INFO namenode.FSNamesystem: HA Enabled: false
16/06/01 13:33:36 INFO namenode.FSNamesystem: Append Enabled: true
16/06/01 13:33:37 INFO util.GSet: Computing capacity for map INodeMap
16/06/01 13:33:37 INFO util.GSet: VM type       = 64-bit
16/06/01 13:33:37 INFO util.GSet: 1.0% max memory 966.7 MB = 9.7 MB
16/06/01 13:33:37 INFO util.GSet: capacity      = 2^20 = 1048576 entries
16/06/01 13:33:37 INFO namenode.NameNode: Caching file names occuring more than 10 times
16/06/01 13:33:37 INFO util.GSet: Computing capacity for map cachedBlocks
16/06/01 13:33:37 INFO util.GSet: VM type       = 64-bit
16/06/01 13:33:37 INFO util.GSet: 0.25% max memory 966.7 MB = 2.4 MB
16/06/01 13:33:37 INFO util.GSet: capacity      = 2^18 = 262144 entries
16/06/01 13:33:37 INFO namenode.FSNamesystem: dfs.namenode.safemode.threshold-pct = 0.9990000128746033
16/06/01 13:33:37 INFO namenode.FSNamesystem: dfs.namenode.safemode.min.datanodes = 0
16/06/01 13:33:37 INFO namenode.FSNamesystem: dfs.namenode.safemode.extension     = 30000
16/06/01 13:33:37 INFO namenode.FSNamesystem: Retry cache on namenode is enabled
16/06/01 13:33:37 INFO namenode.FSNamesystem: Retry cache will use 0.03 of total heap and retry cache entry expiry time is 600000 millis
16/06/01 13:33:37 INFO util.GSet: Computing capacity for map NameNodeRetryCache
16/06/01 13:33:37 INFO util.GSet: VM type       = 64-bit
16/06/01 13:33:37 INFO util.GSet: 0.029999999329447746% max memory 966.7 MB = 297.0 KB
16/06/01 13:33:37 INFO util.GSet: capacity      = 2^15 = 32768 entries
16/06/01 13:33:37 INFO namenode.NNConf: ACLs enabled? false
16/06/01 13:33:37 INFO namenode.NNConf: XAttrs enabled? true
16/06/01 13:33:37 INFO namenode.NNConf: Maximum size of an xattr: 16384
16/06/01 13:33:37 INFO namenode.FSImage: Allocated new BlockPoolId: BP-1092351684-10.0.0.4-1464759217255
16/06/01 13:33:37 INFO common.Storage: Storage directory /home/hadoop/hadoop/dfs/name has been successfully formatted.
16/06/01 13:33:37 INFO namenode.NNStorageRetentionManager: Going to retain 1 p_w_picpaths with txid >= 0
16/06/01 13:33:37 INFO util.ExitUtil: Exiting with status 0
16/06/01 13:33:37 INFO namenode.NameNode: SHUTDOWN_MSG: 
/************************************************************
SHUTDOWN_MSG: Shutting down NameNode at dbserver/10.0.0.4
************************************************************/

4.启动Hadoop

[root@dbserver ~]# /home/hadoop/hadoop/sbin/start-all.sh

5.启动成功

主Hadoop：

[root@dbserver ~]# jps
10818 SecondaryNameNode
11206 Jps
10952 ResourceManager
10649 NameNode

从Hadoop：

[root@gitlab hadoop]# jps
4547 Jps
4437 NodeManager
4342 DataNode