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From Jan Lehnardt <...@apache.org>
Subject Re: A permanent view for user-entered query with complex boolean expressions?
Date Wed, 11 Feb 2009 11:42:38 GMT

On 10 Feb 2009, at 23:10, Barry Wark wrote:

> On Tue, Feb 10, 2009 at 12:34 PM, Chris Anderson <jchris@apache.org>  
> wrote:
>> On Tue, Feb 10, 2009 at 12:09 PM, Paul Davis
>> <paul.joseph.davis@gmail.com> wrote:
>>>
>>> Trunk has support for streaming writes when a Content-Length  
>>> header is
>>> present. Chris Anderson was just working the other day on streaming
>>> writes to disk in the absence of a Content-Length header. That
>>> basically means that if your HTTP client sends a content-length
>>> header, the sky's the limit. If you don't send a Content-Length
>>> header, you'll be limited by the available RAM on the machine  
>>> running
>>> CouchDB until Chris finishes his patch.
>>
>> Just to clear up, currently attachment PUTs without Content-Length
>> headers are rejected. I think that we fixed the RAM buffering issue
>> after all:
>>
>> https://issues.apache.org/jira/browse/COUCHDB-189 (fixed)
>>
>> So if you know the length of the attachment, PUT should work for you
>> no matter how big it is.
>
> Very cool. What about reading the attachment? Is there a significant
> performance hit for streaming the attachment out of the database as
> opposed to reading the data directly out of a separate file?

We don't use sendfile() yet, so it is not optimal, but overhead is  
minimal.

Cheers
Jan
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