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https://issues.apache.org/jira/browse/HADOOP-127?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Owen O'Malley resolved HADOOP-127.
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Resolution: Duplicate
I believe this was fixed by HADOOP-785.
> Unclear precedence of config files and property definitions
> -----------------------------------------------------------
>
> Key: HADOOP-127
> URL: https://issues.apache.org/jira/browse/HADOOP-127
> Project: Hadoop
> Issue Type: Bug
> Components: conf
> Environment: Hadoop 0.1.1, Nutch 0.8-dev
> Reporter: Andrzej Bialecki
> Assignee: Doug Cutting
>
> The order in which configuration resources are read is not sufficiently
> documented, and also there are no mechanisms preventing harmful re-definition
> of certain properties, if they are put in wrong config files.
> From reading the code in Hadoop Configuration.java, JobConf.java and Nutch
> NutchConfiguration.java I _think_ this is what's happening.
> There are two groups of resources: default resources, loaded first, and final
> resources, loaded at the end. All properties (re)-defined in files loaded
> later will override any previous definitions:
> * default resources: loaded in the order as they are added. The following
> files are added here, in order:
> 1. hadoop-default.xml (Configuration)
> 2. nutch-default.xml (NutchConfiguration)
> 3. mapred-default.xml (JobConf)
> 4. job_xx_xxx.xml (JobConf, in JobConf(File config))
> * final resource: which always come after default resources, i.e. if any
> value is defined here it will always override those set in default resources
> (NOTE: including per job settings!!!). The following files are added here, in
> reversed order:
> 2. hadoop-site.xml (Configuration)
> 1. nutch-site.xml (NutchConfiguration)
> (i.e. hadoop-site.xml will take precedence over anything else defined in any
> other config file).
> I would appreciate checking that this is indeed the case, and suggestions how
> to ensure that you cannot so easily shoot yourself in the foot if you define
> wrong properties in hadoop-site or nutch-site ...
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