Hadoop configuration (5)--Start yarn

Newer versions of Hadoop use the new MapReduce framework (MapReduce V2, also known as Yarn,yet another Resource negotiator).

YARN is isolated from MapReduce and is responsible for resource management and task scheduling. YARN runs on MapReduce, providing high availability and scalability.

The above-mentioned adoption./sbin/start-dfs.shstart Hadoop, just start the MapReduce environment, we can start yarn, let yarn to be responsible for resource management and task scheduling.

config mapr-site.xml file  

 
   
  

  
    
   
mv ./etc/hadoop/mapred-site.xml.template ./etc/hadoop/mapred-site.xml
 
   
  

  
 

   
  

  
<configuration>
   
  

  
        <property>
   
  

  
             <name>mapreduce.framework.name</name>
   
  

  
             <value>yarn</value>
   
  

  
        </property>
   
  

  
</configuration>
  
 

Modifying a configuration file Yarn-site.xml :

  
 

   
  

  
<configuration>
   
  

  
        <property>
   
  

  
             <name>yarn.nodemanager.aux-services</name>
   
  

  
             <value>mapreduce_shuffle</value>
   
  

  
            </property>
   
  

  
</configuration>
  
 

start yarn ( ./sbin/start-dfs.sh )

 
   
  

  
    
   
./sbin/start-yarn.sh
 
   
  

Check:

After you start YARN, the method of running the instance is the same, only the resource management method, the task scheduling is different.

Observation log information can be found, when YARN is not enabled, is "mapred." Localjobrunner "After running the task, enabling YARN, is" mapred. Yarnrunner "in the running task. One of the benefits of starting YARN is that you can view the operation of a task through the Web interface:http://localhost:8088/cluster

[Email protected]:/usr/local/hadoop$./sbin/start-dfs.sh

16/06/22 20:28:42 WARN util. nativecodeloader:unable to load Native-hadoop library for your platform ... using Builtin-java classes where applicable

Starting namenodes on [localhost]

Localhost:starting Namenode, logging to/usr/local/hadoop/logs/hadoop-hadoop-namenode-athena.out

Localhost:starting Datanode, logging to/usr/local/hadoop/logs/hadoop-hadoop-datanode-athena.out

Starting secondary namenodes [0.0.0.0]

0.0.0.0:starting Secondarynamenode, logging to/usr/local/hadoop/logs/hadoop-hadoop-secondarynamenode-athena.out

16/06/22 20:29:05 WARN util. nativecodeloader:unable to load Native-hadoop library for your platform ... using Builtin-java classes where applicable

[Email protected]:/usr/local/hadoop$./sbin/start-yarn. Sh

-SU:./sbin/start-yarn. Sh:no such file or directory

[Email protected]:/usr/local/hadoop$./sbin/start-yarn.

Start-yarn.cmd start-yarn.sh

[Email protected]:/usr/local/hadoop$./sbin/start-yarn.sh

Starting Yarn Daemons

Starting ResourceManager, logging to/usr/local/hadoop/logs/yarn-hadoop-resourcemanager-athena.out

Localhost:starting NodeManager, logging to/usr/local/hadoop/logs/yarn-hadoop-nodemanager-athena.out

[Email protected]:/usr/local/hadoop$ JPS

16896 DataNode

17395 NodeManager

17109 Secondarynamenode

16774 NameNode

17271 ResourceManager

17432 Jps

[Email protected]:/usr/local/hadoop$./bin/hdfs dfs-rm-r Output

16/06/22 20:29:46 WARN util. nativecodeloader:unable to load Native-hadoop library for your platform ... using Builtin-java classes where applicable

16/06/22 20:29:47 INFO fs. Trashpolicydefault:namenode Trash Configuration:deletion interval = 0 minutes, emptier interval = 0 minutes.

Deleted output

[email protected]:/usr/local/hadoop$./bin/hadoop jar./share/hadoop/mapreduce/hadoop-mapreduce-examples-2.7.2.jar WordCount Input/core-site.xml Output/result

From for notes (Wiz)

Hadoop configuration (5)--Start yarn