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From Michael Segel <michael_se...@hotmail.com>
Subject Re: On coprocessor API evolution
Date Fri, 16 May 2014 16:13:42 GMT
Until you move the coprocessor out of the RS space and into its own sandbox… saying security
and coprocessor in the same sentence is a joke. 
Oh wait… you were serious… :-(

I’d say there’s a significant rethink on coprocessors that’s required.

Anyone running a secure (kerberos) cluster, will want to allow system coprocessors but then
write a coprocessor that reject user coprocessors. 

Just putting it out there… 

On May 15, 2014, at 2:13 AM, Andrew Purtell <apurtell@apache.org> wrote:

> Because coprocessor APIs are so tightly bound with internals, if we apply
> suggested rules like as mentioned on HBASE-11054:
>      I'd say policy should be no changes to method apis across minor
> versions
> This will lock coprocessor based components to the limitations of the API
> as we encounter them. Core code does not suffer this limitation, we are
> otherwise free to refactor and change internal methods. For example, if we
> apply this policy to the 0.98 branch, then we will have to abandon further
> security feature development there and move to trunk only. This is because
> we already are aware that coprocessor APIs as they stand are insufficient
> still.
> Coprocessor APIs are a special class of internal method. We have had a
> tension between allowing freedom of movement for developing them out and
> providing some measure of stability for implementors for a while.
> It is my belief that the way forward is something like HBASE-11125. Perhaps
> we can take this discussion to that JIRA and have this long overdue
> conversation.
> Regarding security features specifically, I would also like to call your
> attention to HBASE-11127. I think security has been an optional feature
> long enough, it is becoming a core requirement for the project, so should
> be moved into core. Sure, we can therefore sidestep any issues with
> coprocessor API sufficiency for hosting security features. However, in my
> opinion we should pursue both HBASE-11125 and HBASE-11127; the first to
> provide the relative stability long asked for by coprocessor API users, the
> latter to cleanly solve emerging issues with concurrency and versioning.
> -- 
> Best regards,
>   - Andy
> Problems worthy of attack prove their worth by hitting back. - Piet Hein
> (via Tom White)

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