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How to make a large cluster smaller by taking out some of the nodes? |
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Answer» Hadoop offers the decommission feature to retire a set of existing data-nodes. The nodes to be retired should be included into the exclude file, and the exclude file name should be specified as a configuration parameter dfs.hosts.exclude. The decommission process can be terminated at any time by editing the configuration or the exclude files and repeating the -refreshNodes command |
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