问题描述
我在Ubuntu 16.04上安装了Hadoop 2.7.4。我试图在伪模式下运行它。
我为所有的hadoop文件，NameNode和DataNode文件装载了'/ hadoop'分区。
I have Hadoop 2.7.4 installed on Ubuntu 16.04. I'm trying to run it in Pseudo Mode.I have a '/hadoop' partition mounted for all my hadoop files, NameNode and DataNode files.
我的core-site.xml是：
My core-site.xml is:
<configuration>
<property>
<name>fs.defaultFS</name>
<value>hdfs://localhost:9000</value>
</property>
</configuration>
我的hdfs-site.xml是：
My hdfs-site.xml is:
<configuration>
<property>
<name>dfs.replication</name>
<value>1</value>
</property>
<property>
<name>dfs.name.dir</name>
<value>/hadoop/nodes/namenode</value>
</property>
<property>
<name>dfs.data.dir</name>
<value>/hadoop/nodes/datanode</value>
</property>
</configuration>
我的mapred-site.xml是：
My mapred-site.xml is:
<configuration>
<property>
<name>Map-Reduce.framework.name</name>
<value>yarn</value>
</property>
</configuration>
我的yarn-site.xml是：
My yarn-site.xml is:
<configuration>
<property>
<name>yarn.nodemanager.aux-services</name>
<value>Map-Reduce_shuffle</value>
</property>
</configuration>
运行后
After running
$ start-dfs.sh
$ start-yarn.sh
$ jps
$
I get the following daemons running.
2800 ResourceManager
2290 NameNode
4242 Jps
2440 DataNode
2634 SecondaryNameNode
start-yarn.sh给我：
start-yarn.sh gives me:
$ start-yarn.sh
starting yarn daemons
starting resourcemanager, logging to /hadoop/hadoop-2.7.4/logs/yarn-abdy-resourcemanager-abdy-hadoop.out
localhost: starting nodemanager, logging to /hadoop/hadoop-2.7.4/logs/yarn-abdy-nodemanager-abdy-hadoop.out
nodemanager守护程序似乎根本不会启动。
我已经尝试了2天来解决这个问题，但我似乎无法找到解决办法。有人请指导我。
The nodemanager daemon does not seem to start at all.I've tried for 2 days to fix this issue but I cannot seem to find a fix. Someone please guide me.
推荐答案
如果您第一次启动hadoop守护进程，那么
首先，您必须格式化您的namenode：
If your going to start hadoop daemons for the first time.
First you have to format your namenode :
hadoop namenode -format
然后执行：
Then you execute:
hadoop namenode -format
一旦格式化了namenode
Once formatting of namenode is done.
you execute following commands.
start-dfs.sh
start-yarn.sh
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