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hadoop - Hadoop 2.9 多节点

问题描述

我有 3 台服务器 Centos 7（防火墙和 selinux 禁用）chadoop1（主）、chadoop2（从）和 chadoop3（从）

当我启动服务时，节点没有启动，我在 jps 上看到，不显示 DataNode 和 NodeManager。

所有配置在节点上都是 rsync（从属除外）

我尝试重新格式化，显示OK，但同样的问题。

我的目录是：/opt/hadoop

配置：

hdfs-site.xml

<configuration>
    <property>
            <name>dfs.data.dir</name>
            <value>/opt/hadoop/dfs/name/data</value>
            <final>true</final>
    </property>
    <property>
            <name>dfs.name.dir</name>
            <value>/opt/hadoop/dfs/name</value>
            <final>true</final>
    </property>
    <property>
            <name>dfs.replication</name>
            <value>2</value>
    </property>

核心站点.xml

<configuration>

<property>
    <name>fs.defaultFS</name>
    <value>hdfs://localhost:8020/</value>
    <description>NameNode URI</description>
</property>

<property>
  <name>io.file.buffer.size</name>
  <value>131072</value>
  <description>Buffer size</description>
</property>

mapred-site.xml

<configuration>

<property>
    <name>mapreduce.framework.name</name>
    <value>yarn</value>
    <description>MapReduce framework name</description>
</property>

<property>
  <name>mapreduce.jobhistory.address</name>
  <value>localhost:10020</value>
  <description>Default port is 10020.</description>
</property>

<property>
  <name>mapreduce.jobhistory.webapp.address</name>
  <value>localhost:19888</value>
  <description>Default port is 19888.</description>
</property>

<property>
  <name>mapreduce.jobhistory.intermediate-done-dir</name>
  <value>/mr-history/tmp</value>
  <description>Directory where history files are written by MapReduce jobs.</description>
</property>

<property>
  <name>mapreduce.jobhistory.done-dir</name>
  <value>/mr-history/done</value>
  <description>Directory where history files are managed by the MR JobHistory Server.</description>
</property>

纱线站点.xml

<configuration>

<property>
    <name>mapreduce.framework.name</name>
    <value>yarn</value>
    <description>MapReduce framework name</description>
</property>

<property>
  <name>mapreduce.jobhistory.address</name>
  <value>localhost:10020</value>
  <description>Default port is 10020.</description>
</property>

<property>
  <name>mapreduce.jobhistory.webapp.address</name>
  <value>localhost:19888</value>
  <description>Default port is 19888.</description>
</property>

<property>
  <name>mapreduce.jobhistory.intermediate-done-dir</name>
  <value>/mr-history/tmp</value>
  <description>Directory where history files are written by MapReduce jobs.</description>
</property>

<property>
  <name>mapreduce.jobhistory.done-dir</name>
  <value>/mr-history/done</value>
  <description>Directory where history files are managed by the MR JobHistory Server.</description>
</property>

从属（仅在主控上，从属有本地主机）

chadoop3
chadoop4

启动服务

[hadoop@chadoop1 hadoop]$ start-dfs.sh
 Starting namenodes on [localhost]
 localhost: starting namenode, logging to /opt/hadoop/logs/hadoop-hadoop- 
 namenode-chadoop1.out
 chadoop4: starting datanode, logging to /opt/hadoop/logs/hadoop-hadoop- 
 datanode-chadoop4.out
 chadoop3: starting datanode, logging to /opt/hadoop/logs/hadoop-hadoop-                    
 datanode-chadoop3.out
 Starting secondary namenodes [0.0.0.0]
 0.0.0.0: starting secondarynamenode, logging to /opt/hadoop/logs/hadoop- 
 hadoop-secondarynamenode-chadoop1.out

 [hadoop@chadoop1 hadoop]$ jps
 5603 Jps
 5492 SecondaryNameNode
 5291 NameNode
 [hadoop@chadoop1 hadoop]$ start-yarn.sh
 starting yarn daemons
 starting resourcemanager, logging to /opt/hadoop/logs/yarn-hadoop-               
 resourcemanager-chadoop1.out
 chadoop3: starting nodemanager, logging to /opt/hadoop/logs/yarn-hadoop- 
 nodemanager-chadoop3.out
 chadoop4: starting nodemanager, logging to /opt/hadoop/logs/yarn-hadoop- 
 nodemanager-chadoop4.out
 [hadoop@chadoop1 hadoop]$ jps
 5492 SecondaryNameNode
 5658 ResourceManager
 5914 Jps
 5291 NameNode

标签： hadoop

解决方案

所有配置在节点上都是 rsync（从属除外）

所有配置必须在所有节点上。

localhost话虽如此，数据节点需要知道 NameNode 在网络上的哪个位置存在，因此如果服务器实际上应该是从站，则该进程无法启动。因此，您必须输入实际的主机名。

YARN 服务也是如此。

我在 jps 上看到，不显示 DataNode 和 NodeManager。

从显示的输出中，您似乎只在主机上启动了服务，而不是存在这些服务的两个从机。

启动脚本只控制一台机器，不控制集群，并且jps只会显示本地机器的Java进程

顺便说一句，Apache Ambari 使安装和管理 Hadoop 集群变得更加容易。

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