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From "Paul Joseph Davis (JIRA)" <>
Subject [jira] [Commented] (COUCHDB-1170) include attachment md5 sums in _attachments
Date Wed, 18 May 2011 21:58:47 GMT


Paul Joseph Davis commented on COUCHDB-1170:

I don't really have anything against show the checksum, though I might take md5 out of the
name in case we ever decide to change the hash algorithm.

As to replication, do we short circuit attachment updates based on md5 somewhere? I haven't
spent the time reading through the new replicator yet but I would've thought I'd heard of
that bit.

> include attachment md5 sums in _attachments
> -------------------------------------------
>                 Key: COUCHDB-1170
>                 URL:
>             Project: CouchDB
>          Issue Type: Bug
>          Components: HTTP Interface
>    Affects Versions: 1.0.2
>            Reporter: Randall Leeds
>            Priority: Minor
>             Fix For: 1.1
>         Attachments: 0001-include-md5sum-field-in-_attachments-entries.patch
> Crucial to functioning replication is deterministic revisions. Attachment md5 sums are
used in CouchDB's revision generation (see couch_db:new_revid/1).
> Alternative CouchDB implementations may find it impossible or impractical to support
binary attachments yet still wish to track changes and replicate efficiently with Apache CouchDB.
To this end, such implementations need an efficient way to fetch all metadata necessary for
calculating compatible revisions in the event of locally executed future updates.
> As a bonus, exposing this metadata is particularly beneficial for filesystem sync tools
(such as couchapp implementations), e.g. through eliminating the need for redundantly storing
checksums as user data on synchronized documents.
> To this end I propose the following 5-line patch which applies cleanly to trunk, 1.1.x
and 1.0.x.

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