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Decommission DataNode Role on NN

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Explorer

Hi All,  we have a NameNode host that also contains a Datanode role, HBase Region server, Impala Daemon, and Solr Server (see image attached).  I am ready to decommission and remove the Datanode role from this host.   

 

Do I need to decommission and remove the Impala, HBase, Solr roles first?  (and I guess remove the Resource Manager role as well).  Anything else I should be aware of? 

 

Notes: I have already followed the "tuning before decommision" section of this article.  We also have 6 other dedicated data nodes.  Thank you!

 

 

roles.jpg

 

 

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Explorer

Okay thanks @bgooley!  So I would just decommision the datanode role first, let it finish, then delete the datanode role - correct?  There is about 8TB of data on this node.

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Master Guru

@DataMike,

 

That should be OK.  You can consider what to do with the other roles afterward.  Just note that if the impalad or regionserver are used for anything, they will need to read/write to a remote DataNode and they will also be competing with the movement of blocks from the decomissioned dn to a new one.