使用命令行启动和停止hadoop生态系统的最佳方式是什么？ [英] What is best way to start and stop hadoop ecosystem, with command line?

问题描述

我看到有几种方式可以启动hadoop生态系统，

1. start-all。 sh& stop-all.sh
   其中说它已被弃用使用start-dfs.sh& start-yarn.sh。
   

2. start-dfs.sh，stop-dfs.sh和start-yarn.sh，stop-yarn.sh c $ c $ <


3. hadoop-daemon.sh namenode / datanode和yarn-deamon.sh resourcemanager 编辑：我认为每个命令都必须有一些特定的用例。

   $ b $
   $ b
b

解决方案

start-all.sh& stop-all.sh：用于一次启动和停止hadoop守护进程。在主机上发布它将启动/停止群集中所有节点上的守护进程。已弃用，因为您已经注意到。





start-dfs.sh，stop-dfs.sh和start-yarn.sh，stop-yarn.sh：与上面相同，但是在主机的所有节点上分别启动/停止HDFS和YARN守护进程。建议现在通过start-all.sh& amp; amp; stop-all.sh



hadoop-daemon.sh namenode / datanode和yarn-deamon.sh resourcemanager ：启动个人守护进程机器手动。您需要转到特定节点并发出这些命令。





使用案例：假设您已向集群添加了新的DN，并且只需要启动DN守护程序在这台机器上，



  bin / hadoop-daemon.sh启动datanode 
  

注意：如果您想从一台机器启动所有节点上的所有守护进程，则应启用ssh。





希望这会回答您的查询。




I see there are several ways we can start hadoop ecosystem,

1. start-all.sh & stop-all.sh Which say it's deprecated use start-dfs.sh & start-yarn.sh.

2. start-dfs.sh, stop-dfs.sh and start-yarn.sh, stop-yarn.sh

3. hadoop-daemon.sh namenode/datanode and yarn-deamon.sh resourcemanager

EDIT: I think there has to be some specific use cases for each command.

解决方案

start-all.sh & stop-all.sh : Used to start and stop hadoop daemons all at once. Issuing it on the master machine will start/stop the daemons on all the nodes of a cluster. Deprecated as you have already noticed.

start-dfs.sh, stop-dfs.sh and start-yarn.sh, stop-yarn.sh : Same as above but start/stop HDFS and YARN daemons separately on all the nodes from the master machine. It is advisable to use these commands now over start-all.sh & stop-all.sh

hadoop-daemon.sh namenode/datanode and yarn-deamon.sh resourcemanager : To start individual daemons on an individual machine manually. You need to go to a particular node and issue these commands.

Use case : Suppose you have added a new DN to your cluster and you need to start the DN daemon only on this machine,

bin/hadoop-daemon.sh start datanode

Note : You should have ssh enabled if you want to start all the daemons on all the nodes from one machine.

Hope this answers your query.

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