在CentOS上配置HDFS快照需要遵循以下步骤:
确保你已经在CentOS上安装并正确配置了Hadoop。以下是基本步骤:
wget https://archive.apache.org/dist/hadoop/common/hadoop-3.3.1/hadoop-3.3.1.tar.gz
tar -xzvf hadoop-3.3.1.tar.gz -C /usr/local/
ln -s /usr/local/hadoop-3.3.1 /usr/local/hadoop
编辑/etc/profile.d/hadoop.sh
文件:
export HADOOP_HOME=/usr/local/hadoop
export PATH=$PATH:$HADOOP_HOME/bin:$HADOOP_HOME/sbin
然后使配置生效:
source /etc/profile.d/hadoop.sh
编辑$HADOOP_HOME/etc/hadoop/core-site.xml
:
<configuration>
<property>
<name>fs.defaultFS</name>
<value>hdfs://localhost:9000</value>
</property>
</configuration>
编辑$HADOOP_HOME/etc/hadoop/hdfs-site.xml
:
<configuration>
<property>
<name>dfs.replication</name>
<value>1</value>
</property>
<property>
<name>dfs.namenode.name.dir</name>
<value>/usr/local/hadoop/data/namenode</value>
</property>
<property>
<name>dfs.datanode.data.dir</name>
<value>/usr/local/hadoop/data/datanode</value>
</property>
<property>
<name>dfs.support.append</name>
<value>true</value>
</property>
<property>
<name>dfs.namenode.checkpoint.period</name>
<value>3600</value>
</property>
<property>
<name>dfs.namenode.max.transfer.threads</name>
<value>40</value>
</property>
<property>
<name>dfs.namenode.handler.count</name>
<value>100</value>
</property>
<property>
<name>dfs.namenode.snapshot.period</name>
<value>604800</value>
</property>
<property>
<name>dfs.namenode.snapshot.max</name>
<value>10</value>
</property>
</configuration>
start-dfs.sh
hdfs dfs -mkdir /user/hadoop/snapshots
hdfs dfsadmin -allowSnapshot /user/hadoop
编辑$HADOOP_HOME/etc/hadoop/hdfs-site.xml
,添加或修改以下配置:
<property>
<name>dfs.namenode.snapshot.max</name>
<value>10</value>
</property>
<property>
<name>dfs.namenode.checkpoint.period</name>
<value>3600</value>
</property>
<property>
<name>dfs.namenode.max.transfer.threads</name>
<value>40</value>
</property>
<property>
<name>dfs.namenode.handler.count</name>
<value>100</value>
</property>
hdfs dfs -createSnapshot /user/hadoop /snapshot1
hdfs dfs -listSnapshots /user/hadoop
hdfs dfs -restoreSnapshot /user/hadoop /snapshot1
hdfs dfs -deleteSnapshot /user/hadoop /snapshot1
通过以上步骤,你可以在CentOS上成功配置和使用HDFS快照功能。