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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11357) Secure Delete
Date Fri, 03 Feb 2017 19:30:52 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11357?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15851999#comment-15851999
] 

Andrew Purtell commented on HDFS-11357:
---------------------------------------

bq. Would you be accepting of introducing this on a per-file basis rather than per-DataNode?
[...]  This would certainly require changes to delete() API though. Thoughts?
A lot of work and API change for a limited option, though. 



> Secure Delete
> -------------
>
>                 Key: HDFS-11357
>                 URL: https://issues.apache.org/jira/browse/HDFS-11357
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>            Reporter: Andrew Purtell
>            Assignee: Andrew Purtell
>            Priority: Minor
>         Attachments: 0001-HDFS-secure-delete.patch, HDFS-11357.patch
>
>
> Occasionally for compliance or other legal/process reasons it is necessary to attest
that data has been deleted in such a way that it cannot be retrieved even through low level
forensics (for some reasonable definition of this that typically excludes the resources a
state actor can bring to data recovery). HDFS at-rest encryption offers one way to achieve
this, if the data keying strategy is highly granular. One simply "forgets" a key corresponding
to a given set of files and the data becomes irretrievable. However if HDFS at-rest encryption
is not enabled or a fine grained keying strategy is not possible, another simple strategy
can be employed. 
> The objective is to ensure once a block is deleted no trace of the data within the block
exists on disk in unallocated regions, for all blocks, providing assurance deleted data cannot
be recovered at any time through reasonable effort even with low level access. 



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