What are the different ways to restart NameNode in Hadoop?

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- September 20, 2018 at 5:22 pm #6214
  
  DataFlair Team
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  How to restart NameNode or all the daemons in Hadoop?
  What is the best way to restart all the daemons in Hadoop?
- September 20, 2018 at 5:23 pm #6215
  
  DataFlair Team
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  There are three ways to start the Daemons in Hadoop
  1. start-all.sh & stop-all.sh : To start/stop all the deamons on all the nodes from Master machine all at once.
  
  2. a). start-dfs.sh, stop-dfs.sh : to start/ stop HDFS daemons separately on all the nodes from Master machine
  
  b). start-yarn.sh, stop-yarn.sh : : to start/ stop Yarn daemons separately on all the nodes from Master machine
  
  3. a)hadoop-daemon.sh namenode/datanode : To start idatanode/Namenode on an individual machine manually(e.g. this can be used when a new datanode is added and this datanode needs to be started on that particular machine)
  
  b)yarn-deamon.sh resourcemanager : To start a Yarn service on an individual machine manually
  
  start-dfs.sh, stop-dfs.sh and start-yarn.sh, stop-yarn.sh are preferred over start-all.sh & stop-all.sh
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