[大数据]13. Hadoop集群搭建 - 启动HDFS分布式文件系统 - 基于CentOS7 -【连载中】

续上一篇文章：12. Hadoop集群搭建 - 分发并修改文件 - 基于CentOS7 -【连载中】

上一篇文章已经将配置好的环境变量文件以及Hadoop配置文件分发给两台从机，未操作的同学请自行移步至上一篇文章。

请务必查看防火墙状态！
命令如下：
systemctl status firewalld
三台主机都要查看！

格式化两遍主节点master

hdfs namenode -format

例如：

[root@master ~]# hdfs namenode -format

结果：

[root@master ~]# hdfs namenode -format
21/08/12 00:58:59 INFO namenode.NameNode: STARTUP_MSG: 
/************************************************************
STARTUP_MSG: Starting NameNode
STARTUP_MSG:   host = master/192.168.**.***
STARTUP_MSG:   args = [-format]
STARTUP_MSG:   version = 2.7.4
STARTUP_MSG:   classpath = /usr/apps/hadoop/hadoop-2.7.4/etc/hadoop:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/curator-client-2.7.1.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/commons-net-3.1.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/jackson-xc-1.9.13.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/log4j-1.2.17.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/gson-2.2.4.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/hamcrest-core-1.3.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/commons-io-2.4.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/commons-configuration-1.6.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/activation-1.1.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/api-util-1.0.0-M20.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/jets3t-0.9.0.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/apacheds-i18n-2.0.0-M15.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/jetty-util-6.1.26.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/commons-collections-3.2.2.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/zookeeper-3.4.6.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/jackson-core-asl-1.9.13.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/commons-beanutils-core-1.8.0.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/jsch-0.1.54.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/jaxb-impl-2.2.3-1.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/commons-math3-3.1.1.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/servlet-api-2.5.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/commons-logging-1.1.3.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/jsr305-3.0.0.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/commons-beanutils-1.7.0.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/xz-1.0.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/jaxb-api-2.2.2.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/jetty-sslengine-6.1.26.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/curator-recipes-2.7.1.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/snappy-java-1.0.4.1.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/guava-11.0.2.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/httpcore-4.2.5.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/hadoop-auth-2.7.4.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/junit-4.11.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/slf4j-log4j12-1.7.10.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/jackson-jaxrs-1.9.13.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/paranamer-2.3.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/netty-3.6.2.Final.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/jsp-api-2.1.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/asm-3.2.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/stax-api-1.0-2.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/apacheds-kerberos-codec-2.0.0-M15.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/commons-codec-1.4.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/hadoop-annotations-2.7.4.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/jetty-6.1.26.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/htrace-core-3.1.0-incubating.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/commons-lang-2.6.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/commons-compress-1.4.1.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/commons-cli-1.2.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/jettison-1.1.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/curator-framework-2.7.1.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/java-xmlbuilder-0.4.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/slf4j-api-1.7.10.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/commons-digester-1.8.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/httpclient-4.2.5.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/api-asn1-api-1.0.0-M20.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/protobuf-java-2.5.0.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/jersey-server-1.9.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/mockito-all-1.8.5.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/commons-httpclient-3.1.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/jersey-core-1.9.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/xmlenc-0.52.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/jackson-mapper-asl-1.9.13.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/jersey-json-1.9.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/lib/avro-1.7.4.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/hadoop-nfs-2.7.4.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/hadoop-common-2.7.4-tests.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/common/hadoop-common-2.7.4.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/hdfs:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/hdfs/lib/xml-apis-1.3.04.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/hdfs/lib/commons-cli-1.2.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/hdfs/lib/netty-all-4.0.23.Final.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/hdfs/lib/protobuf-java-2.5.0.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/hdfs/lib/jersey-server-1.9.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/hdfs/lib/jersey-core-1.9.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/hdfs/lib/xmlenc-0.52.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/hdfs/lib/jackson-mapper-asl-1.9.13.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/hdfs/lib/leveldbjni-all-1.8.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/hdfs/lib/log4j-1.2.17.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/hdfs/lib/commons-io-2.4.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/hdfs/lib/jetty-util-6.1.26.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/hdfs/lib/jackson-core-asl-1.9.13.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/hdfs/lib/xercesImpl-2.9.1.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/hdfs/lib/servlet-api-2.5.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/hdfs/lib/commons-logging-1.1.3.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/hdfs/lib/jsr305-3.0.0.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/hdfs/lib/guava-11.0.2.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/hdfs/lib/commons-daemon-1.0.13.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/hdfs/lib/netty-3.6.2.Final.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/hdfs/lib/asm-3.2.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/hdfs/lib/commons-codec-1.4.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/hdfs/lib/jetty-6.1.26.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/hdfs/lib/htrace-core-3.1.0-incubating.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/hdfs/lib/commons-lang-2.6.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/hdfs/hadoop-hdfs-2.7.4.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/hdfs/hadoop-hdfs-2.7.4-tests.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/hdfs/hadoop-hdfs-nfs-2.7.4.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/yarn/lib/commons-lang-2.6.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/yarn/lib/commons-compress-1.4.1.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/yarn/lib/guice-3.0.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/yarn/lib/commons-cli-1.2.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/yarn/lib/jettison-1.1.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/yarn/lib/protobuf-java-2.5.0.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/yarn/lib/jersey-server-1.9.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/yarn/lib/jersey-core-1.9.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/yarn/lib/jackson-mapper-asl-1.9.13.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/yarn/lib/jersey-json-1.9.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/yarn/lib/jackson-xc-1.9.13.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/yarn/lib/leveldbjni-all-1.8.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/yarn/lib/guice-servlet-3.0.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/yarn/lib/log4j-1.2.17.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/yarn/lib/commons-io-2.4.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/yarn/lib/activation-1.1.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/yarn/lib/jetty-util-6.1.26.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/yarn/lib/commons-collections-3.2.2.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/yarn/lib/zookeeper-3.4.6.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/yarn/lib/jersey-guice-1.9.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/yarn/lib/jackson-core-asl-1.9.13.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/yarn/lib/jaxb-impl-2.2.3-1.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/yarn/lib/javax.inject-1.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/yarn/lib/jersey-client-1.9.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/yarn/lib/servlet-api-2.5.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/yarn/lib/commons-logging-1.1.3.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/yarn/lib/jsr305-3.0.0.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/yarn/lib/xz-1.0.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/yarn/lib/jaxb-api-2.2.2.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/yarn/lib/guava-11.0.2.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/yarn/lib/zookeeper-3.4.6-tests.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/yarn/lib/jackson-jaxrs-1.9.13.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/yarn/lib/netty-3.6.2.Final.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/yarn/lib/asm-3.2.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/yarn/lib/stax-api-1.0-2.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/yarn/lib/aopalliance-1.0.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/yarn/lib/commons-codec-1.4.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/yarn/lib/jetty-6.1.26.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/yarn/hadoop-yarn-client-2.7.4.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/yarn/hadoop-yarn-server-resourcemanager-2.7.4.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/yarn/hadoop-yarn-common-2.7.4.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/yarn/hadoop-yarn-applications-distributedshell-2.7.4.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/yarn/hadoop-yarn-applications-unmanaged-am-launcher-2.7.4.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/yarn/hadoop-yarn-api-2.7.4.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/yarn/hadoop-yarn-server-tests-2.7.4.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/yarn/hadoop-yarn-server-web-proxy-2.7.4.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/yarn/hadoop-yarn-server-sharedcachemanager-2.7.4.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/yarn/hadoop-yarn-server-common-2.7.4.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/yarn/hadoop-yarn-server-nodemanager-2.7.4.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/yarn/hadoop-yarn-server-applicationhistoryservice-2.7.4.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/yarn/hadoop-yarn-registry-2.7.4.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/mapreduce/lib/commons-compress-1.4.1.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/mapreduce/lib/guice-3.0.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/mapreduce/lib/protobuf-java-2.5.0.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/mapreduce/lib/jersey-server-1.9.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/mapreduce/lib/jersey-core-1.9.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/mapreduce/lib/jackson-mapper-asl-1.9.13.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/mapreduce/lib/avro-1.7.4.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/mapreduce/lib/leveldbjni-all-1.8.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/mapreduce/lib/guice-servlet-3.0.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/mapreduce/lib/log4j-1.2.17.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/mapreduce/lib/hamcrest-core-1.3.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/mapreduce/lib/commons-io-2.4.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/mapreduce/lib/jersey-guice-1.9.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/mapreduce/lib/jackson-core-asl-1.9.13.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/mapreduce/lib/javax.inject-1.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/mapreduce/lib/xz-1.0.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/mapreduce/lib/snappy-java-1.0.4.1.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/mapreduce/lib/junit-4.11.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/mapreduce/lib/paranamer-2.3.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/mapreduce/lib/netty-3.6.2.Final.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/mapreduce/lib/asm-3.2.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/mapreduce/lib/aopalliance-1.0.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/mapreduce/lib/hadoop-annotations-2.7.4.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/mapreduce/hadoop-mapreduce-client-hs-plugins-2.7.4.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/mapreduce/hadoop-mapreduce-client-jobclient-2.7.4.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/mapreduce/hadoop-mapreduce-client-app-2.7.4.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/mapreduce/hadoop-mapreduce-client-common-2.7.4.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/mapreduce/hadoop-mapreduce-client-jobclient-2.7.4-tests.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/mapreduce/hadoop-mapreduce-client-core-2.7.4.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/mapreduce/hadoop-mapreduce-client-hs-2.7.4.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.7.4.jar:/usr/apps/hadoop/hadoop-2.7.4/share/hadoop/mapreduce/hadoop-mapreduce-client-shuffle-2.7.4.jar:/usr/apps/hadoop/hadoop-2.7.4/contrib/capacity-scheduler/*.jar
STARTUP_MSG:   build = https://shv@git-wip-us.apache.org/repos/asf/hadoop.git -r cd915e1e8d9d0131462a0b7301586c175728a282; compiled by 'kshvachk' on 2017-08-01T00:29Z
STARTUP_MSG:   java = 1.8.0_161
************************************************************/
21/08/12 00:58:59 INFO namenode.NameNode: registered UNIX signal handlers for [TERM, HUP, INT]
21/08/12 00:58:59 INFO namenode.NameNode: createNameNode [-format]
[Fatal Error] yarn-site.xml:16:3: The content of elements must consist of well-formed character data or markup.
21/08/12 00:58:59 FATAL conf.Configuration: error parsing conf yarn-site.xml
org.xml.sax.SAXParseException; systemId: file:/usr/apps/hadoop/hadoop-2.7.4/etc/hadoop/yarn-site.xml; lineNumber: 16; columnNumber: 3; The content of elements must consist of well-formed character data or markup.
	at org.apache.xerces.parsers.DOMParser.parse(Unknown Source)
	at org.apache.xerces.jaxp.DocumentBuilderImpl.parse(Unknown Source)
	at javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:150)
	at org.apache.hadoop.conf.Configuration.parse(Configuration.java:2482)
	at org.apache.hadoop.conf.Configuration.parse(Configuration.java:2470)
	at org.apache.hadoop.conf.Configuration.loadResource(Configuration.java:2541)
	at org.apache.hadoop.conf.Configuration.loadResources(Configuration.java:2494)
	at org.apache.hadoop.conf.Configuration.getProps(Configuration.java:2407)
	at org.apache.hadoop.conf.Configuration.get(Configuration.java:981)
	at org.apache.hadoop.conf.Configuration.getTrimmed(Configuration.java:1031)
	at org.apache.hadoop.conf.Configuration.getLong(Configuration.java:1304)
	at org.apache.hadoop.security.Groups.<init>(Groups.java:86)
	at org.apache.hadoop.security.Groups.<init>(Groups.java:74)
	at org.apache.hadoop.security.Groups.getUserToGroupsMappingService(Groups.java:303)
	at org.apache.hadoop.security.UserGroupInformation.initialize(UserGroupInformation.java:285)
	at org.apache.hadoop.security.UserGroupInformation.ensureInitialized(UserGroupInformation.java:262)
	at org.apache.hadoop.security.UserGroupInformation.isAuthenticationMethodEnabled(UserGroupInformation.java:339)
	at org.apache.hadoop.security.UserGroupInformation.isSecurityEnabled(UserGroupInformation.java:333)
	at org.apache.hadoop.hdfs.server.namenode.NameNode.format(NameNode.java:968)
	at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1441)
	at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1566)
21/08/12 00:58:59 ERROR namenode.NameNode: Failed to start namenode.
java.lang.RuntimeException: org.xml.sax.SAXParseException; systemId: file:/usr/apps/hadoop/hadoop-2.7.4/etc/hadoop/yarn-site.xml; lineNumber: 16; columnNumber: 3; The content of elements must consist of well-formed character data or markup.
	at org.apache.hadoop.conf.Configuration.loadResource(Configuration.java:2647)
	at org.apache.hadoop.conf.Configuration.loadResources(Configuration.java:2494)
	at org.apache.hadoop.conf.Configuration.getProps(Configuration.java:2407)
	at org.apache.hadoop.conf.Configuration.get(Configuration.java:981)
	at org.apache.hadoop.conf.Configuration.getTrimmed(Configuration.java:1031)
	at org.apache.hadoop.conf.Configuration.getLong(Configuration.java:1304)
	at org.apache.hadoop.security.Groups.<init>(Groups.java:86)
	at org.apache.hadoop.security.Groups.<init>(Groups.java:74)
	at org.apache.hadoop.security.Groups.getUserToGroupsMappingService(Groups.java:303)
	at org.apache.hadoop.security.UserGroupInformation.initialize(UserGroupInformation.java:285)
	at org.apache.hadoop.security.UserGroupInformation.ensureInitialized(UserGroupInformation.java:262)
	at org.apache.hadoop.security.UserGroupInformation.isAuthenticationMethodEnabled(UserGroupInformation.java:339)
	at org.apache.hadoop.security.UserGroupInformation.isSecurityEnabled(UserGroupInformation.java:333)
	at org.apache.hadoop.hdfs.server.namenode.NameNode.format(NameNode.java:968)
	at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1441)
	at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1566)
Caused by: org.xml.sax.SAXParseException; systemId: file:/usr/apps/hadoop/hadoop-2.7.4/etc/hadoop/yarn-site.xml; lineNumber: 16; columnNumber: 3; The content of elements must consist of well-formed character data or markup.
	at org.apache.xerces.parsers.DOMParser.parse(Unknown Source)
	at org.apache.xerces.jaxp.DocumentBuilderImpl.parse(Unknown Source)
	at javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:150)
	at org.apache.hadoop.conf.Configuration.parse(Configuration.java:2482)
	at org.apache.hadoop.conf.Configuration.parse(Configuration.java:2470)
	at org.apache.hadoop.conf.Configuration.loadResource(Configuration.java:2541)
	... 15 more
21/08/12 00:58:59 INFO util.ExitUtil: Exiting with status 1
21/08/12 00:58:59 INFO namenode.NameNode: SHUTDOWN_MSG: 
/************************************************************
SHUTDOWN_MSG: Shutting down NameNode at master/192.168.**.***
************************************************************/
[root@master ~]# 

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启动dfs服务

start-dfs.sh

例如：

[root@master ~]# start-dfs.sh

实际结果：

[root@master ~]# start-dfs.sh 
Starting namenodes on [master]
master: starting namenode, logging to /usr/apps/hadoop/hadoop-2.7.4/logs/hadoop-root-namenode-master.out
slave2: starting datanode, logging to /usr/apps/hadoop/hadoop-2.7.4/logs/hadoop-root-datanode-slave2.out
slave1: starting datanode, logging to /usr/apps/hadoop/hadoop-2.7.4/logs/hadoop-root-datanode-slave1.out
Starting secondary namenodes [0.0.0.0]
0.0.0.0: starting secondarynamenode, logging to /usr/apps/hadoop/hadoop-2.7.4/logs/hadoop-root-secondarynamenode-master.out
[root@master ~]# 

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启动yarn服务

start-yarn.sh

例如：

[root@master ~]# start-yarn.sh

结果：

[root@master ~]# start-yarn.sh 
starting yarn daemons
starting resourcemanager, logging to /usr/apps/hadoop/hadoop-2.7.4/logs/yarn-root-resourcemanager-master.out
slave1: starting nodemanager, logging to /usr/apps/hadoop/hadoop-2.7.4/logs/yarn-root-nodemanager-slave1.out
slave2: starting nodemanager, logging to /usr/apps/hadoop/hadoop-2.7.4/logs/yarn-root-nodemanager-slave2.out
[root@master ~]# 

查看进程

• 三台主机输入：

jps

Master主机：

[root@master ~]# jps
5424 SecondaryNameNode
5569 ResourceManager
5891 Jps
5243 NameNode
[root@master ~]# 

Slave1主机：

[root@slave1 ~]# jps
4977 Jps
4765 DataNode
4863 NodeManager
[root@slave1 ~]# 

Salve2主机：

[root@slave2 ~]# jps
12411 DataNode
12509 NodeManager
12637 Jps

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