Proposal of WORM/Retention Translator

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Hi all,

I'm Karthik Subrahmanya, working as an intern in Red Hat, Bangalore.

I, along with Joseph Fernandes (Mentor), will be implementing File-Level WORM-Retention feature for GlusterFS.

What is WORM-Retention FS?
1. WORM/Retention FS is a file system that supports immutable(read-only) and undeletable files.
2. Each file will have its own worm/retention attribute. Like Retention Period, Retention Time/Date, WORM/Retention State etc
3. It stores data in a tamper-proof and secure way and data accessibility policies.

What is already implemented in Gluster?
The existing WORM implementation in GlusterFS works at volume level as a switch.
It makes all the files in the volume read-only if it is switched on, which is might be desirable or applicable for Data Compliance usage.[1]

Our idea is to implement a file level WORM, in which it saves the WORM/Retention attribute for each file in the volume.


Please refer [2] for more on design.

Our approach will be step by step,

1. Implement WORM-Retention Semantics in GlusterFS using the WORM Xlator
2. Integrate WORM-Retention with Bitrot with WORM-Retention Feature for Data Validation
3. Help in implementing Control of atime, mtime, ctime [3], as its a requirement for us
4. Tiering based on Compliance (Stress Goal)

We have done a POC on WORM-Retention Semantics [4]. We are working on making it well baked.

Vijai (vmallika@xxxxxxxxxx) and Raghavendra Talur (rtalur@xxxxxxxxxx) have helped us in implementing the POC.

Your valuable suggestions are most welcome and expecting your support in the future work!

Thanks & Regards,
Karthik Subrahmanya

[1] https://en.wikipedia.org/wiki/Regulatory_compliance
[2] http://www.gluster.org/community/documentation/index.php/Features/gluster_compliance_archive
[3] http://nongnu.13855.n7.nabble.com/distributed-files-directories-and-cm-time-updates-td207822.html
[4] http://review.gluster.org/13429
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