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From: Nick Dimiduk <ndimiduk@gmail.com>
Date: Tue, 11 Feb 2014 15:49:04 -0700
Message-ID: 
 <CANZa=GvEFFS3YzcseG3=bdHtLFHb2-Xac=ztNXRWaDe975QUKw@mail.gmail.com>
Subject: Re: DISCUSSION: 1.0.0
To: hbase-dev <dev@hbase.apache.org>
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On Tue, Feb 11, 2014 at 1:46 PM, Stack <stack@duboce.net> wrote:

> A few us have gotten the "We need a Replication Interface defined" along
> another channel.
>

I've set HBASE-9507 to 0.99.0. Is there a better way to mark it (and these
1.0 issues in general) for further discussion?

 On Tue, Feb 11, 2014 at 11:21 AM, Nick Dimiduk <ndimiduk@gmail.com> wrote:
>
> > FYI, Lily's Indexer [0] also makes use of this level of integration int=
o
> > HBase. Others?
> >
> > [0]: https://github.com/NGDATA/hbase-indexer
> >
> >
> > On Tue, Feb 11, 2014 at 12:09 PM, Enis S=C3=B6ztutar <enis.soz@gmail.co=
m>
> > wrote:
> >
> > > This is good discussion,
> > >
> > > I mentioned this in phoenix-dev that we need to repurpose coprocessor=
s,
> > and
> > > just give them put / get kind of injection points, but not allow
> > > co-processors to tap into log / compaction, etc. Those will be better
> > > served by explicitly defined plugins (like the recent StorageEngine,
> > HLog,
> > > etc) that we explicitly allow injecting code with some API stability
> > > (though probably still evolving at a fast pace).
> > >
> > > It would be good to have an idea of what classes / methods, phoenix a=
nd
> > > similar depend on HBase right now.
> > >
> > > Enis
> > >
> > >
> > > On Mon, Feb 10, 2014 at 6:04 PM, Jeffrey Zhong <jzhong@hortonworks.co=
m
> > > >wrote:
> > >
> > > >
> > > > We need to revisit which interfaces should be marked as real
> "private"
> > > > because coprocessors allow custom applications to accesses internal
> > > > states. Current private interface such as KeyValue, WALEdit, Hregio=
n,
> > > > HLogKey, Store etc is may used by custom coprocessor applications s=
o
> > any
> > > > public method signature change in those "private" interfaces
> possibliy
> > > > breaks custom coprocessor implementations.
> > > >
> > > > -Jeffrey
> > > >
> > > > On 2/10/14 4:59 PM, "lars hofhansl" <larsh@apache.org> wrote:
> > > >
> > > > >True. But we can clearly annotate what is public and what is not.
> > > > >In HRegion we'd have to do it per method. It's probably easier to
> > > extract
> > > > >the public interface out into a Interface. (similar to Store and
> > HStore)
> > > > >HBASE-4207 solves a slightly different problem. Here I want to hav=
e
> > > > >access to some HBase internals for performance, but I want to know
> > what
> > > > >is public and stable and what I should not touch (thinking about
> > things
> > > > >like Phoenix).
> > > > >
> > > > >
> > > > >-- Lars
> > > > >
> > > > >
> > > > >
> > > > >________________________________
> > > > > From: Andrew Purtell <apurtell@apache.org>
> > > > >To: "dev@hbase.apache.org" <dev@hbase.apache.org>
> > > > >Sent: Monday, February 10, 2014 4:46 PM
> > > > >Subject: Re: DISCUSSION: 1.0.0
> > > > >
> > > > >
> > > > >On Mon, Feb 10, 2014 at 4:42 PM, lars hofhansl <larsh@apache.org>
> > > wrote:
> > > > >
> > > > >
> > > > >> + known coprocessor interfaces. For example right now a
> coprocessor
> > > can
> > > > >> use everything on HRegion. We need to distill what's useful into
> an
> > > > >> interface.
> > > > >
> > > > >
> > > > >We started this with Environment and the HTable wrapper as an
> example
> > of
> > > > >how to wrap an interface for CPs. At the end of the day we can't
> stop
> > a
> > > > >coprocessor from accessing internal objects and calling their
> methods
> > > > >directly until HBASE-4047. (Maybe that makes the 1.0 list?)
> > > > >
> > > > >Related, paring down the coprocessor interfaces to only intercept
> RPC
> > > > >based
> > > > >actions and move everything else to plugins.
> > > > >
> > > > >
> > > > >
> > > > >--
> > > > >Best regards,
> > > > >
> > > > >   - Andy
> > > > >
> > > > >Problems worthy of attack prove their worth by hitting back. - Pie=
t
> > Hein
> > > > >(via Tom White)
> > > >
> > > >
> > > >
> > > > --
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