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From "Chris Anderson (JIRA)" <>
Subject [jira] Commented: (COUCHDB-583) storing attachments in compressed form and serving them in compressed form if accepted by the client
Date Fri, 29 Jan 2010 03:55:34 GMT


Chris Anderson commented on COUCHDB-583:

Looking at Mimeparse and your Mochiweb patches, it looks like you are covering parts of HTTP
that Mimeparse doesn't handle yet. So disregard my last comment about using it instead. And
I see that the accept stuff is in Mochi also. Rad.

So it looks like we can commit this. I'd sure appreciate anyone's help upgrading Mochi from
upstream (properly).

Filipe, the Mimeparse lib might appreciate your contribution.

> storing attachments in compressed form and serving them in compressed form if accepted
by the client
> ----------------------------------------------------------------------------------------------------
>                 Key: COUCHDB-583
>                 URL:
>             Project: CouchDB
>          Issue Type: New Feature
>          Components: Database Core, HTTP Interface
>         Environment: CouchDB trunk
>            Reporter: Filipe Manana
>         Attachments: couchdb-583-trunk-10th-try.patch, couchdb-583-trunk-11th-try.patch,
couchdb-583-trunk-12th-try.patch, couchdb-583-trunk-13th-try.patch, couchdb-583-trunk-14th-try-git.patch,
couchdb-583-trunk-15th-try-git.patch, couchdb-583-trunk-16th-try-git.patch, couchdb-583-trunk-3rd-try.patch,
couchdb-583-trunk-4th-try-trunk.patch, couchdb-583-trunk-5th-try.patch, couchdb-583-trunk-6th-try.patch,
couchdb-583-trunk-7th-try.patch, couchdb-583-trunk-8th-try.patch, couchdb-583-trunk-9th-try.patch,
jira-couchdb-583-1st-try-trunk.patch, jira-couchdb-583-2nd-try-trunk.patch
> This feature allows Couch to gzip compress attachments as they are being received and
store them in compressed form.
> When a client asks for downloading an attachment (e.g. GET somedb/somedoc/attachment.txt),
the attachment is sent in compressed form if the client's http request has gzip specified
as a valid transfer encoding for the response (using the http header "Accept-Encoding"). Otherwise
couch decompresses the attachment before sending it back to the client.
> Attachments are compressed only if their MIME type matches one of those listed in a separate
config file. Compression level is also configurable in the default.ini file.
> This follows Damien's suggestion from 30 November:
> "Perhaps we need a separate user editable ini file to specify compressable or non-compressable
files (would probably be too big for the regular ini file). What do other web servers do?
> Also, a potential optimization is to compress the file while writing to disk, and serve
the compressed bytes directly to clients that can handle it, and decompressed for those that
can't. For compressable types, it's a win for both disk IO for reads and writes, and CPU on
> Patch attached.

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