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https://issues.apache.org/jira/browse/HADOOP-3938?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12625808#action_12625808
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Robert Chansler commented on HADOOP-3938:
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Somewhat more subtle than R's comment, it would not be possible to create a
file in a directory with zero quota as creation requires that a block's-worth
of quota is available. But one might think of setting a zero quota on a
directory with only zero-length files. In general, new file creations can be
prevented by setting a directory's byte quota to the sum of existing file
lengths, or the name quota to the number of existing files and directories.
Also, did you want to include the updated documentation in this patch?
> Quotas for disk space management
> --------------------------------
>
> Key: HADOOP-3938
> URL: https://issues.apache.org/jira/browse/HADOOP-3938
> Project: Hadoop Core
> Issue Type: New Feature
> Components: dfs
> Reporter: Robert Chansler
> Assignee: Raghu Angadi
> Fix For: 0.19.0
>
> Attachments: HADOOP-3938.patch, hdfs_quota_admin_guide.pdf,
> hdfs_quota_admin_guide.xml
>
>
> Directory quotas for bytes limit the number of bytes used by files in and
> below the directory. Operation is independent of name quotas (HADOOP-3187),
> but the implementation is parallel. Each file is charged according to its
> length multiplied by its intended replication factor.
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