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RE: svn commit: r986865 - /subversion/trunk/notes/wc-ng/node-data

From: Bert Huijben <bert_at_vmoo.com>
Date: Wed, 18 Aug 2010 13:05:50 -0700

> -----Original Message-----
> From: philip_at_apache.org [mailto:philip_at_apache.org]
> Sent: woensdag 18 augustus 2010 12:17
> To: commits_at_subversion.apache.org
> Subject: svn commit: r986865 - /subversion/trunk/notes/wc-ng/node-data
>
> Author: philip
> Date: Wed Aug 18 19:16:59 2010
> New Revision: 986865
>
> URL: http://svn.apache.org/viewvc?rev=986865&view=rev
> Log:
> Some initial thoughts about NODE_DATA from the Sheffield meeting.
>
> * notes/wc-ng/node-data: New.
>
> Added:
> subversion/trunk/notes/wc-ng/node-data (with props)
>
> Added: subversion/trunk/notes/wc-ng/node-data
> URL: http://svn.apache.org/viewvc/subversion/trunk/notes/wc-ng/node-
> data?rev=986865&view=auto
> ==========================================================
> ====================
> --- subversion/trunk/notes/wc-ng/node-data (added)
> +++ subversion/trunk/notes/wc-ng/node-data Wed Aug 18 19:16:59 2010
> @@ -0,0 +1,255 @@
> +NODE_DATA Design (Sheffield 2010-08-18)
> +=======================================
> +
> +Essentially it replaces BASE_NODE and WORKING_NODE by combining all
> +the existing columns with a new op_depth column where op_depth == 0 is
> +the old BASE_NODE and op_depth != 0 is the old WORKING_NODE.

I don't think it *replaces* BASE_NODE and WORKING_NODE. It will contain data for both, but it doesn't replace these tables.

Maybe it can replace WORKING_NODE, but BASE_NODE has more information than the columns you list here. Thinks like the repos_relpath and copyfrom_* are only defined on BASE and/or an operation root.

That is why they are still modeled to stay on BASE_NODE and WORKING_NODE. And last time I looked at the design, translated_size and last_mod_time (used for optimizing away comparisions from things like 'svn status') were still on BASE and WORKING as they are only relevant for nodes that are in the wc.

> +
> + Category Columns
> +
> + indexing: wc_id, local_relpath, parent_relpath, op_depth
> + status: presence
> + node-rev: repos_id, repos_relpath, revnum
> + content: kind, properties, depth, target, checksum
> + last-change: changed_rev, changed_date, changed_author
> + wc-cache: translated_size, last_mod_time
> + misc: dav_cache, file_external
> +
> +When op_depth == 0 the node-rev columns represent the checked-out
> +repository node, otherwise they represent the copyfrom node.
> +
> +Presence has the same six values as BASE_NODE/WORKING_NODE:
> normal,
> +incomplete, absent, excluded, not-present, base-deleted. There are
> +some presence/op_depth constraints, e.g. base-deleted is not valid for
> +op_depth 0 and absent is not valid for op_depth != 0.
> +

<snip>

        Bert
Received on 2010-08-18 22:07:02 CEST

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