? ??? ??? ???? Apache Hadoop? ???? ?????? ?????. ?? ??? ?? ???? ? ?? ??? ?? ??? ??? ?????.

1 ?? : Java? ??????

???? Java 8 ??? ???? ??? ??????. ?? ??? ???? OpenJDK 8? ??????.

 Sudo ??? ????
sudo apt ?? OpenJDK-8-JDK

?? ?? :

 ?? -??

2 ?? : Hadoop? ?????? ?? ?????

Apache Hadoop? ?? ? ????? ?? ??? Hadoop? ?????? ??? ???? (? /usr/local/hadoop )? ??? ??????.

 wget https://downloads.apache.org/hadoop/common/hadoop-3.3.1/hadoop-3.3.1.tar.gz
tar -xzvf hadoop -3.3.1.tar.gz -c/usr/local/hadoop
````(?? ?? ???`hadoop-3.3.1 '? ??????)


** 3 ?? : ?? ?? ?? **

`~/.bashrc` ??? ???? ?? ?? ??? ??????.

```Bash
Hadoop_home =/usr/local/hadoop ????
???? ?? = $ ?? : $ hadoop_home/bin : $ hadoop_home/sbin

?? ??? ??????.

 ?? ~/.bashrc

4 ?? : Hadoop ?? ??? ?????

Hadoop ?????? ?? ??? ??????.

• Core-Site.xml :

<configuration>
  <property>
    <name>fs.defaultfs</name>
    <value>hdfs : // namenode : 9000</value>
  </property>
</configuration>

• hdfs-site.xml :

<configuration>
  <property>
    <name>dfs.replication</name>
    <value>3</value>
  </property>
  <property>
    <name>dfs.namenode.name.dir</name>
    <value>/usr/local/hadoop/dfs/name</value>
  </property>
  <property>
    <name>dfs.datanode.data.dir</name>
    <value>/usr/local/hadoop/dfs/data</value>
  </property>
</configuration>

• mapred-site.xml :

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

• yarn-site.xml :

<configuration>
  <property>
    <name>yarn.nodemanager.aux-services</name>
    <value>mapreduce_shuff</value>
  </property>
  <property>
    <name>yarn.nodemanager.aux-services.mapreduce.shuffle.class</name>
    <value>org.apache.hadoop.mapred.shufflehandler</value>
  </property>
</configuration>

5 ?? : HDFS ??

Namenode ???? ?? ??? HDFS ???? ??????.

 HDFS NAMENODE -FORMAT

6 ?? : Hadoop ???? ??????

Namenode ???? Namenode ? Datanode? ??????.

 start-dfs.sh

ResourceManager ???? ??? ??????.

 start-yarn.sh

7 ?? : ?? ?? ???

Hadoop ???? ?? :

 Su -Hadoop

?? ???? ? ?? ?? :

 mkdir ~/??
vi ~/input/date.txt

??? ???? ?????? (? : "Hello World", "Hello Hadoop"), ?? ? ??.

WordCount ?? ? :

 hadoop jar /usr/local/hadoop/share/hadoop/mapreduce/hadoop-mapreduce-examples-*
```(?? JAR ??? ?? ??? ?? ??????)

???? :

```Bash
ls ~/??
Cat ~/??/Part-R-00000

??? ??? Hadoop ?? ??? ????? ???? ??? ?????. ?? ??? ??? ???? ??? ???? ?????. ???? ??? ?? ?? ?? ??? ?????. ??? ??? ?? ?? ??? ?? Hadoop ??? ??????.

? ??? ??? ??? ????? ??? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!