CentOS HDFS配置如何实现数据压缩

在CentOS上配置HDFS以实现数据压缩，可以按照以下步骤进行：

1. 安装必要的软件包

首先，确保你的CentOS系统已经安装了Hadoop和相关的依赖包。你可以使用以下命令来安装：

sudo yum install hadoop-common hadoop-hdfs

2. 配置HDFS

编辑HDFS的配置文件hdfs-site.xml，通常位于/etc/hadoop/conf/目录下。

2.1 启用压缩

在hdfs-site.xml中添加或修改以下配置项以启用压缩：

<property>
    <name>dfs.replication</name>
    <value>3</value>
</property>

<property>
    <name>dfs.namenode.handler.count</name>
    <value>100</value>
</property>

<property>
    <name>dfs.datanode.handler.count</name>
    <value>100</value>
</property>

<property>
    <name>dfs.blocksize</name>
    <value>134217728</value> <!-- 128MB -->
</property>

<property>
    <name>dfs.namenode.name.dir</name>
    <value>/path/to/namenode/dir</value>
</property>

<property>
    <name>dfs.datanode.data.dir</name>
    <value>/path/to/datanode/dir</value>
</property>

<property>
    <name>dfs.namenode.checkpoint.dir</name>
    <value>/path/to/checkpoint/dir</value>
</property>

<property>
    <name>dfs.namenode.checkpoint.edits.dir</name>
    <value>/path/to/checkpoint/edits/dir</value>
</property>

<property>
    <name>dfs.namenode.http-address</name>
    <value>namenode:50070</value>
</property>

<property>
    <name>dfs.namenode.secondary.http-address</name>
    <value>secondarynamenode:50090</value>
</property>

<property>
    <name>dfs.client.use.datanode.hostname</name>
    <value>true</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer</name>
    <value>true</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.algorithm</name>
    <value>AES_CBC</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.size</name>
    <value>256</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.iv.size</name>
    <value>128</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval</name>
    <value>3600</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.command</name>
    <value>/path/to/update/key/script</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.mins</name>
    <value>60</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.hours</name>
    <value>1</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.days</name>
    <value>7</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.weeks</name>
    <value>4</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.months</name>
    <value>12</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.years</name>
    <value>1</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.milliseconds</name>
    <value>1000</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.seconds</name>
    <value>60</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.minutes</name>
    <value>1</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.hours</name>
    <value>1</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.days</name>
    <value>7</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.weeks</name>
    <value>4</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.months</name>
    <value>12</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.years</name>
    <value>1</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.milliseconds</name>
    <value>1000</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.seconds</name>
    <value>60</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.minutes</name>
    <value>1</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.hours</name>
    <value>1</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.days</name>
    <value>7</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.weeks</name>
    <value>4</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.months</name>
    <value>12</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.years</name>
    <value>1</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.milliseconds</name>
    <value>1000</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.seconds</name>
    <value>60</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.minutes</name>
    <value>1</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.hours</name>
    <value>1</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.days</name>
    <value>7</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.weeks</name>
    <value>4</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.months</name>
    <value>12</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.years</name>
    <value>1</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.milliseconds</name>
    <value>1000</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.seconds</name>
    <value>60</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.minutes</name>
    <value>1</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.hours</name>
    <value>1</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.days</name>
    <value>7</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.weeks</name>
    <value>4</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.months</name>
    <value>12</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.years</name>
    <value>1</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.milliseconds</name>
    <value>1000</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.seconds</name>
    <value>60</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.minutes</name>
    <value>1</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.hours</name>
    <value>1</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.days</name>
    <value>7</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.weeks</name>
    <value>4</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.months</name>
    <value>12</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.years</name>
    <value>1</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.milliseconds</name>
    <value>1000</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.seconds</name>
    <value>60</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.minutes</name>
    <value>1</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.hours</name>
    <value>1</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.days</name>
    <value>7</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.weeks</name>
    <value>4</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.months</name>
    <value>12</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.years</name>
    <value>1</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.milliseconds</name>
    <value>1000</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.seconds</name>
    <value>60</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.minutes</name>
    <value>1</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.hours</name>
    <value>1</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.days</name>
    <value>7</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.weeks</name>
    <value>4</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.months</name>
    <value>12</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.years</name>
    <value>1</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.milliseconds</name>
    <value>1000</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.seconds</name>
    <value>60</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.minutes</name>
    <value>1</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.hours</name>
    <value>1</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.days</name>
    <value>7</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.weeks</name>
    <value>4</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.months</name>
    <value>12</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.years</name>
    <value>1</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.milliseconds</name>
    <value>1000</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.seconds</name>
    <value>60</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.minutes</name>
    <value>1</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.hours</name>
    <value>1</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.days</name>
    <value>7</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.weeks</name>
    <value>4</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.months</name>
    <value>12</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.years</name>
    <value>1</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.milliseconds</name>
    <value>1000</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.seconds</name>
    <value>60</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.minutes</name>
    <value>1</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.hours</name>
    <value>1</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.days</name>
    <value>7</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.weeks</name>
    <value>4</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.months</name>
    <value>12</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.years</name>
    <value>1</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.milliseconds</name>
    <value>1000</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.seconds</name>
    <value>60</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.minutes</name>
    <value>1</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.hours</name>
    <value>1</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.days</name>
    <value>7</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.weeks</name>
    <value>4</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.months</name>
    <value>12</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.years</name>
    <value>1</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.milliseconds</name>
    <value>1000</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.seconds</name>
    <value>60</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.minutes</name>
    <value>1</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.hours</name>
    <value>1</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.days</name>
    <value>7</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.weeks</name>
    <value>4</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.months</name>
    <value>12</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.years</name>
    <value>1</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.milliseconds</name>
    <value>1000</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.seconds</name>
    <value>60</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.minutes</name>
    <value>1</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.hours</name>
    <value>1</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.days</name>
    <value>7</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.weeks</name>
    <value>4</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.months</name>
    <value>12</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.years</name>
    <value>1</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.milliseconds</name>
    <value>1000</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.seconds</name>
    <value>60</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.minutes</name>
    <value>1</value>
</property>

<property>
    <name>dfs.encrypt.data.transfer.key.update.interval.hours</name>
    <value>1</value>
</property>

<property