hadoop dfsadmin _report
时间: 2023-12-08 14:22:17 浏览: 142
The "hadoop dfsadmin -report" command is used to get a report of the current status of the Hadoop Distributed File System (HDFS). This command provides information on the total capacity, used capacity, remaining capacity, and number of blocks in the HDFS. It also shows the number of live and dead data nodes, and their respective storage capacities. Additionally, this command provides information on the rack topology of the data nodes, and the distribution of data blocks across the data nodes. This report is useful for monitoring the health and performance of the HDFS, and for identifying any issues or imbalances in the data distribution.
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hadoop dfsadmin -report
The "hadoop dfsadmin -report" command is used in Hadoop to get a summary report of the status of the distributed file system (DFS). This command provides information on the total number of nodes in the cluster, the amount of storage available, and the amount of storage used. It also shows the status of each DataNode in the cluster, including the amount of storage each node is using and the amount of data being transferred between nodes. This command is useful for monitoring the health of the Hadoop cluster, identifying any issues or problems, and optimizing performance.
请扮演一个终端(4)修改hadoop-env.sh配置文件,将JAVA_HOME的路径设置为JDK的安装目录。 (5)重新格式化名称节点。 (6)全开启Hadoop进程。 (7)访问 Web 界面 http://名称节点IP地址:50070 查看 NameNode 和 Datanode 信息。 (8)使用jps命令查看各节点的进程。 (9)hadoop dfsadmin -report命令查看集群信息
好的,以下是修改Hadoop配置文件和执行相关命令的指令:
1. 修改hadoop-env.sh配置文件:
```
$ cd /etc/hadoop/
$ sudo nano hadoop-env.sh
```
找到以下属性:
```
# export JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64
```
将注释去掉,并将路径修改为JDK的安装目录。
```
export JAVA_HOME=/path/to/jdk
```
保存并退出。
2. 重新格式化名称节点:
```
$ hdfs namenode -format
```
该命令会清空HDFS文件系统,格式化名称节点。执行该命令后,需要重新启动Hadoop服务。
3. 全开启Hadoop进程:
```
$ start-all.sh
```
该命令会启动Hadoop集群中所有节点的进程,包括名称节点、数据节点、资源管理器等等。
4. 访问Web界面:
在浏览器中输入以下地址:
```
http://名称节点IP地址:50070
```
该地址会打开Hadoop集群的Web界面,其中包含名称节点和数据节点的信息。
5. 使用jps命令查看进程:
```
$ jps
```
该命令会列出当前节点上所有Java进程的信息,包括Hadoop的各个进程。
6. 查看集群信息:
```
$ hadoop dfsadmin -report
```
该命令会显示Hadoop集群的状态和信息,包括存储容量、已使用容量、数据节点信息等等。
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