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https://issues.apache.org/jira/browse/COUCHDB-583?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12804919#action_12804919
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Chris Anderson commented on COUCHDB-583:
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I haven't really been tuned into the full discussion of this patch -- I think
the biggest questions for something that digs this deep into the file format
are:
How does it impact stability? (looks fine at my cursory glance, aside from
cross compatibility with older versions of the file format, which I'd have to
look more closely at)
What is the payoff? How much space does this save in practice? (say, with email
messages as attachments, vs with pngs or minified js) I'm not asking you to do
all that work, just think that real numbers are a selling point.
If it's a big payoff then this becomes a priority. We might also want to add
options for compressing the views.
> storing attachments in compressed form and serving them in compressed form if
> accepted by the client
> ----------------------------------------------------------------------------------------------------
>
> Key: COUCHDB-583
> URL: https://issues.apache.org/jira/browse/COUCHDB-583
> 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-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 read."
> Patch attached.
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