Hadoop : Starting Datanode doesn't seem to respond

Question

我的测试环境

我正在尝试在我的测试环境中部署一个基于 3 个节点的 Hadoop 集群:

• 1 个名称节点(主节点:172.30.10.64)
• 2 个数据节点(slave1:172.30.10.72 和 slave2:172.30.10.62)

我将具有主属性的文件配置到我的名称节点中，并将具有从属属性的文件配置到我的数据节点中。

硕士文件

主持人:

127.0.0.1       localhost
172.30.10.64    master
172.30.10.62    slave2
172.30.10.72    slave1

# The following lines are desirable for IPv6 capable hosts
::1     localhost ip6-localhost ip6-loopback
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters

hdfs-site.xml :

<configuration>
    <property>
        <name>dfs.replication</name>
        <value>2</value>
    </property>
    <property>
        <name>dfs.namenode.name.dir</name>
        <value>file:/usr/local/hadoop_tmp/hdfs/namenode</value>
    </property>
</configuration>

核心网站.xml :

<configuration>
    <property>
        <name>fs.default.name</name>
        <value>hdfs://master:9000</value>
    </property>
</configuration>

yarn 网站.xml:

<configuration>
    <property>
        <name>yarn.resourcemanager.resource-tracker.address</name>
        <value>master:8025</value>
    </property>
    <property>
        <name>yarn.resourcemanager.scheduler.address</name>
        <value>master:8030</value>
    </property>
    <property>
        <name>yarn.resourcemanager.address</name>
        <value>master:8050</value>
    </property>
</configuration>

mapred-site.xml :

<configuration>
    <property> 
        <name>mapreduce.framework.name</name> 
        <value>yarn</value>
    </property> 
    <property>
        <name>mapreduce.jobhistory.address</name> 
        <value>master:10020</value> 
    </property>
</configuration>

我有奴隶文件:

slave1
slave2

母版文件:

master

从属文件:

我只添加了根据主文件更改的文件。

hdfs-site.xml :

<configuration>
    <property>
        <name>dfs.replication</name>
        <value>2</value>
    </property>
    <property>
        <name>dfs.datanode.data.dir</name>
        <value>file:/usr/local/hadoop_tmp/hdfs/datanode</value>
    </property>
</configuration>

我的问题

我从 /usr/local/hadoop/sbin 启动:

./start-dfs.sh && ./start-yarn.sh

这是我得到的:

hduser@master:/usr/local/hadoop/sbin$ ./start-dfs.sh && ./start-yarn.sh 
18/03/14 10:45:50 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
Starting namenodes on [master]
hduser@master's password: 
master: starting namenode, logging to /usr/local/hadoop-2.7.5/logs/hadoop-hduser-namenode-master.out
hduser@slave2's password: hduser@slave1's password: 
slave2: starting datanode, logging to /usr/local/hadoop-2.7.5/logs/hadoop-hduser-datanode-slave2.out

所以我从我的 slave2 打开了日志文件:

2018-03-14 10:46:05,494 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: master/172.30.10.64:9000. Already tried 0 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECOND$
2018-03-14 10:46:06,495 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: master/172.30.10.64:9000. Already tried 1 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECOND$
2018-03-14 10:46:07,496 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: master/172.30.10.64:9000. Already tried 2 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECOND$

我做了什么

我尝试了一些东西，但到目前为止都没有效果:

• 从主站到从站以及从站之间 ping 正常
• ssh 从主站到从站以及从站之间工作正常
• hdfs namenode -format 在我的主节点
• 重新创建 Namenode 和 Datanaode 文件夹
• 在我的主虚拟机中打开端口 9000
• 防火墙已禁用:sudo ufw status --> 已禁用

我有点迷茫，因为一切似乎都很好，我不知道为什么我不克服启动我的 hadoop 集群。

Answer 1

我也许会找到答案:

我从主节点重新生成 ssh key ，然后复制到从节点。它现在似乎可以工作了。

#Generate a ssh key for hduser
$ ssh-keygen -t rsa -P ""

#Authorize the key to enable password less ssh 
$ cat /home/hduser/.ssh/id_rsa.pub >> /home/hduser/.ssh/authorized_keys
$ chmod 600 authorized_keys

#Copy this key to slave1 to enable password less ssh and slave2 too
$ ssh-copy-id -i ~/.ssh/id_rsa.pub slave1
$ ssh-copy-id -i ~/.ssh/id_rsa.pub slave2