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https://issues.apache.org/jira/browse/HADOOP-5323?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14726993#comment-14726993
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Weiwei Yang commented on HADOOP-5323:
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We surely should improve the document for trash, it is out-of-date and people
would easily get confused. The document should cover issues that resolved in
HADOOP-6761. I proposed to revise the doc to
*File Deletes and Undeletes*
When a file is deleted by a user or an application, it is not immediately
removed from HDFS. Instead, HDFS moves it to a trash directory (each user has
its own trash directory under `/user/<username>/.Trash`). Most recent deleted
files are moved to the current trash directory
(`/user/<username>/.Trash/Current`), and in a configurable interval, HDFS
creates checkpoints (under `/user/<username>/.Trash/<date>`) for files in
current trash directory and deletes old checkpoints when they are expired.
Current default the trash feature is disabled (Delete files without storing in
trash), user can enable this feature by setting a value greater than zero for
parameter `fs.trash.interval` (in core-site.xml). This value tells the NameNode
how long a checkpoint will be expired and removed from HDFS. In addition, user
can configure an appropriate time to tell NameNode how often to create
checkpoints in trash (the parameter stored as `fs.trash.checkpoint.interval` in
core-site.xml), this value should be smaller or equal to fs.trash.interval.
> Trash documentation needs to be more elaborated.
> ------------------------------------------------
>
> Key: HADOOP-5323
> URL: https://issues.apache.org/jira/browse/HADOOP-5323
> Project: Hadoop Common
> Issue Type: Improvement
> Components: documentation
> Affects Versions: 0.18.3
> Reporter: Suman Sehgal
> Assignee: Weiwei Yang
> Priority: Minor
> Labels: newbie
>
> Trash documentation should mention the significance of "Current" and
> "<time-stamp>" directories which get generated inside Trash directory. The
> documentation should also incorporate modifications done in HADOOP: 4970.
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