Current HDFS architecture information about Trash is incorrectly documented as -
The current default policy is to delete files from /trash that are more than 6 hours old. In the future, this policy will be configurable through a well defined interface.
It should be something like -
Current default trash interval is set to 0 (Deletes file without storing in trash ) . This value is configurable parameter stored as fs.trash.interval stored in core-site.xml .