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https://issues.apache.org/jira/browse/HADOOP-2715?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Allen Wittenauer updated HADOOP-2715:
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Component/s: documentation
> Review and document '_' prefix convention in input directories
> --------------------------------------------------------------
>
> Key: HADOOP-2715
> URL: https://issues.apache.org/jira/browse/HADOOP-2715
> Project: Hadoop Common
> Issue Type: Bug
> Components: documentation
> Reporter: eric baldeschwieler
> Labels: newbie
>
> We use files and directories prefixed with '_' to store logs, metadata and
> other info that might be useful to the owner of a job within the output
> directory. The standard input methods then ignore such files by default.
> HADOOP-2391 lead to some discussion of the '_' convention in output
> directories. No all developers input formats are supporting this. We should
> review the convention and document it well so that future input methods
> support it. Or we should come up with an alternate approach.
> My hope is that after some discuss we will close this bug by creating a
> documentation patch explaining the convention.
> It sounds like the convention is implemented via some input filter classes.
> We should discuss if this generic solution is helping or obscuring the intent
> of the convention. Perhaps we should just have a non-configurable filter, so
> '_' prefixed files are treated like '.' prefixed files by most unix tools.
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