Is the file described in the documentation as a read-only configuration file, src/core/core-default.xml, used by Hadoop at startup? Some of the docs say to copy this file to conf/core-site.xml and make changes and some say to include only those properties being changed. If the latter is the case, it seems the core-default.xml file is necessary.
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2 Answers
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core-default.xml is loaded first and then core-site.xml is overlayed on that. core-site.xml will only contain the values that need to be changed from the default.
See the resources section at the top of: http://hadoop.apache.org/docs/current/api/org/apache/hadoop/conf/Configuration.html
