Hadoop:启动Datanode似乎没有响应

Question

我正试图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）

我在namenode中配置了主属性文件，在datananodes中配置了从属性文件。

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站点。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>

核心站点。xml:

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

yarn-site.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

主文件：

master

我只添加了与主文件不同的文件。

hdfs站点。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>

我从/usr/本地/hadoop/sbin启动：

/启动dfs。嘘

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$

我尝试了一些东西，但到目前为止没有效果：

• 从主人到奴隶以及奴隶之间的“平”效果很好
• 从主服务器到从服务器以及从服务器之间的ssh工作正常
• hdfs namenode-在我的主节点中格式化
• 重新创建Namenode和Datanaode文件夹
• 在我的主VM中打开端口9000
• 防火墙已禁用：sudo ufw status--

我有点不知所措，因为一切似乎都很好，我不知道为什么我不能克服困难启动我的hadoop集群。

Answer 1

我可能会找到答案：

我从主节点重新生成ssh密钥，然后复制到从节点。它现在似乎起作用了。

#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