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The requirement is to add a new data node to a running Hadoop cluster; how do I start services on just one data node? |
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Answer» You do not need to shutdown and/or restart the entire cluster in this case. First, add the new node's DNS name to the conf/slaves file on the master node. Then log in to the new slave node and execute − $ cd path/to/hadoop $ bin/hadoop-daemon.sh start datanode $ bin/hadoop-daemon.sh start tasktracker then issuehadoop dfsadmin -refreshNodes and hadoop mradmin -refreshNodes so that the NameNode and JobTracker know of the additional node that has been added. |
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