dfsadmin -refreshNodes should re-read the config file.
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Key: HADOOP-3720
URL: https://issues.apache.org/jira/browse/HADOOP-3720
Project: Hadoop Core
Issue Type: Bug
Components: dfs
Affects Versions: 0.19.0
Reporter: Lohit Vijayarenu
hadoop dfsadmin -refreshNodes reads files defined by _dfs.hosts_ and
_dfs.hosts.exclude_. If these values are not defined during namenode startup,
then refreshNodes command assumes there are no files. So, while namenode is
running, once cannot just edit the config file and add entries to these config
variables and expect the namenode to read them. Namenode should re-read the
config file when refreshNodes command is invoked.
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