Hadoop環境配置

    Hadoop環境安裝完以後須要進行相應的配置

    Hadoop組件經過XML來配置，core-site.xml用於配置Common組件的屬性，hdfs-site.xml文件用於配置HDFS屬性，mapred-site.xml文件用於配置MapReduce屬性，hdoop支持獨立模式、僞分佈模式、全分佈模式，在不一樣模式下，各屬性的配置：

組件	屬性	獨立模式	僞分佈模式	全分佈模式
common	fs.default.name	file:///(默認)	hdfs://localhost/	hdfs://namenode
hdfs	dfs.replication	N/A	1	3
mapreduce	mapred.job.tracker(hadoop2不用配置)	local(默認)	localhost:8021	jobtracker:8021

    hadoop日誌配置：在hadoop-env.sh中添加export HADOOP_LOG_DIR=/usr/lib/hadoop/logs

    我hadoop2的配置以下：

    core-site.xml

    

<configuration>
        <property>
                <name>fs.default.name</name>
                <value>hdfs://localhost/</value>
        </property>
        <property>
                <name>hadoop.tmp.dir</name>
                <value>/usr/lib/hadoop/tmp/</value>
        </property>
</configuration>

    hdfs-site.xml:

    

<configuration>
        <property>
                <name>dfs.default.name</name>
                <value>/usr/lib/hadoop/logs/</value>
        </property>
        <property>
                <name>dfs.replication</name>
                <value>1</value>
        </property>
        <property>
                <name>dfs.permissions</name>
                <value>false</value>
        </property>
</configuration>

    mapred-site.xml:

    

<configuration>
        <property>
                <name>mapreduce.framework.name</name>
                <value>Yarn</value>
        </property>
</configuration>

    yarn-site.xml:

    

<configuration>
        <property>
                <name>yarn.resourcemanager.resource-tracker.address</name>
                <value>localhost:8990</value>
        </property>
        <property>
                <name>yarn.resourcemanager.scheduler.address</name>
                <value>localhost:8991</value>
        </property>
        <property>
                <name>yarn.resourcemanager.scheduler.class</name>
                <value>org.apache.hadoop.yarn.server.resourcemanage.scheduler.capacity.CapacityScheduler</value>
        </property>
        <property>
                <name>yarn.resourcemanager.address</name>
                <value>localhost:8993</value>
        </property>
        <property>
                <name>yarn.nodemanager.local-dirs</name>
                <value>/usr/lib/hadoop/tmp/node</value>
        </property>
        <property>
                <name>yarn.nodemanager.address</name>
                <value>localhost:8994</value>
        </property>
        <property>
                <name>yarn.nodemanager.resource.memory-mb</name>
                <value>102040</value>
        </property>
        <property>
                <name>yarn.nodemanager.remote-app-log-dir</name>
                <value>/usr/lib/hadoop/tmp/app-logs</value>
        </property>
        <property>
                <name>yarn.nodemanager.log-dirs</name>
                <value>/usr/lib/hadoop/tmp/node</value>
        </property>
        <property>
                <name>yarn.nodemanager.aux-services</name>
                <value>mapreduce_shuffle</value>
        </property>
</configuration>

    slaves:

localhost

    完事以後執行hadoop namenode -fromat 格式化hdfs文件系統。