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https://issues.apache.org/jira/browse/HADOOP-8604?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13419187#comment-13419187
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Jason Lowe commented on HADOOP-8604:
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The conf/ directory within the Hadoop tree is intended to hold the
sample/default configuration. During development, custom configuration changes
are not intended to be placed in that directory, as those changes will be
overwritten during builds. Usually custom configuration is placed in a
separate directory, outside the Hadoop tree, and conveyed to Hadoop via the
HADOOP_CONF_DIR environment variable. You can also specify a config directory
via the --config option to the hadoop front-end script. With a separate config
directory, your changes won't be overwritten during compilation.
> conf/* files overwritten at Hadoop compilation
> ----------------------------------------------
>
> Key: HADOOP-8604
> URL: https://issues.apache.org/jira/browse/HADOOP-8604
> Project: Hadoop Common
> Issue Type: Bug
> Components: conf
> Affects Versions: 1.0.3
> Reporter: Robert Grandl
> Priority: Minor
>
> Whenever I compile hadoop from terminal as:
> ant compile jar run
> all the conf/* files are overwritten. I am not sure if some of them should
> not be like that but at least hadoop-env.sh, mapred-site.ml, core-site.xml,
> hdfs-site.xml, masters, slaves should remains. Otherwise I am forced to
> backup and replace content again after compilation.
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