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From "Alex Karasulu" <akaras...@apache.org>
Subject Re: [ApacheDS] Definition of a partition
Date Fri, 06 Apr 2007 01:12:35 GMT
Thanks a bunch Christine.  Sorry for being lazy - I should have added it
myself.  This release is taking me forever this time though.  I guess I am
loosing my touch.

Alex

On 4/5/07, Christine Koppelt <christine.koppelt@googlemail.com> wrote:
>
> I expanded the first section a bit and added it to the "Architectural
> Overview" page of the AUG
> (http://directory.apache.org/apacheds/1.0/architectural-overview.html).
> Further comments or contributions are welcome :-)
>
> Christine
>
>
> 2007/4/5, Trustin Lee <trustin@gmail.com>:
> > Sounds very good!
> >
> > Trustin
> >
> > On 4/5/07, Alex Karasulu <akarasulu@apache.org> wrote:
> > > To clarify from previous threads ...
> > >
> > > Definition
> > > -------------
> > >
> > > A partition is a physically distinct store for a subset of the entries
> > > contained within a DSA (Directory Server/Service Agent A.K.A the LDAP
> > > server).  The entries of a partition all share the same suffix which
> is the
> > > distinguished name of the namingContext from which the stored entries
> in the
> > > partition are hung from the DIT.  A partition can be implemented using
> any
> > > storage mechanism or can even be backed in memory.  A partition simply
> has
> > > to implement the Partition ( 1.5) interface and by doing so can be
> mounted
> > > in the server at it's suffix/namingContext.
> > >
> > > The server can have any number of partitions (with any implementation)
> > > attached to various namingContexts which are published by the RootDSE
> (empty
> > > string dn "") using the namingContexts operational attribute.  So if
> you
> > > want to see the partitions served by the server you can query the
> RootDSE
> > > for this information.
> > >
> > > Motivation For Terminology
> > > ------------------------------------
> > >
> > > I decided to use the term Partition to denote this structure in the
> server
> > > rather than use the term backend.  Why?  Well to me the backend is
> > > everything after the protocol which is basically all of the core.  The
> > > frontend is the MINA based LDAP protocol service provider.  Another
> reason
> > > for this choice was the fact that a partition is a separate physical
> store
> > > that separates a subset of the entries.  It partitions the DIT, the
> > > namespace hence the term "partition" made sense to me.
> > >
> > > Another crazy reason for this comes from my days as a Linux system
> developer
> > > while writing device drivers (ahhh those were the days).  Anyways I
> really
> > > like to parallel the concepts of the Linux file system terminology
> since it
> > > is almost exactly the same concept but in another domain.  Basically
> file
> > > system partitions which can be backed by any kind of random access
> store can
> > > be mounted at mount points on the file system.  To me the mount point
> is
> > > analogous to the namingContext used to hang the entries stored therein
> off
> > > the DIT (here I'm relating entries to files).   Note this analogy does
> > > breakdown in some places but over all it's a descent analogy which
> warranted
> > > using the name Partition rather than Backend.
> > >
> > > Alex
> > >
> > >
> >
> >
> > --
> > what we call human nature is actually human habit
> > --
> > http://gleamynode.net/
> > --
> > PGP Key ID: 0x0255ECA6
> >
>

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