如何在CentOS上配置HDFS快照

<code>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</code>

<code>export HADOOP_HOME=/usr/local/hadoop
export PATH=$PATH:$HADOOP_HOME/bin:$HADOOP_HOME/sbin</code>

<code>source /etc/profile.d/hadoop.sh</code>

<code><configuration><property><name>fs.defaultFS</name><value>hdfs://localhost:9000</value></property></configuration></code>

<code><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></code>

<code>start-dfs.sh</code>

<code>hdfs dfs -mkdir /user/hadoop/snapshots
hdfs dfsadmin -allowSnapshot /user/hadoop</code>

<code><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></code>

<code>hdfs dfs -createSnapshot /user/hadoop /snapshot1</code>

<code>hdfs dfs -listSnapshots /user/hadoop</code>

<code>hdfs dfs -restoreSnapshot /user/hadoop /snapshot1</code>

<code>hdfs dfs -deleteSnapshot /user/hadoop /snapshot1</code>