Hadoop cluster Installation (4) configuration Jobtracker_conf/mapred-site.xml

Conf/mapred-site.xml

Summary: The main configuration Jobtracker address,scheduler,queue and so on.

1. Configure Jobtracker (must be set)

<configuration>
	<property>
		<name>mapreduce.jobtracker.address</name>
		< Value>node14:9001</value>
		<description>jobtracker ' s address</description>
	</ Property>
</configuration>

2. There are other configurable items

See Hadoop-0.21.0/mapred/src/java/mapred-default.xml in detail, such as

(1) Set up Job scheduler

<property>
  <name>mapreduce.jobtracker.taskscheduler</name>
  <value> Org.apache.hadoop.mapred.jobqueuetaskscheduler</value>
  <description>the class responsible for Scheduling the tasks.</description>
</property>

(2) Job queue

<property>
	<name>mapreduce.job.queuename</name>
	<value>queue-a:queue-b:queue-c </value>
</property>

Mapreduce.jobtracker.system.dir

Mapreduce.cluster.local.dir