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From "Trustin Lee" <trus...@gmail.com>
Subject Re: [ApacheDS] Definition of a partition
Date Thu, 05 Apr 2007 02:15:22 GMT
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
>
>


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