What two processes must you do if you are running a Hadoop cluster with a single NameNode
and six DataNodes, and you want to change a configuration parameter so that it affects all six
DataNodes.
A.
You must modify the configuration files on the NameNode only. DataNodes read their
configuration from the master nodes
B.
You must modify the configuration files on each of the six SataNodes machines
C.
You don’t need to restart any daemon, as they will pick up changes automatically
D.
You must restart the NameNode daemon to apply the changes to the cluster
E.
You must restart all six DatNode daemon to apply the changes to the cluster
B and E are correct answers.
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B and E
http://www.cloudera.com/content/cloudera/en/documentation/cloudera-manager/v4-8-2/Cloudera-Manager-Managing-Clusters/cmmc_mod_configs.html
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“If you change the configuration settings after you start a service or instance, you may need to restart the service or instance to have the configuration settings become active.”
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B&E
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B & E
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Correct answer is BD
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