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From "Filipe Manana (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (COUCHDB-1009) Make couch_stream buffer configurable
Date Sun, 30 Oct 2011 14:08:32 GMT

    [ https://issues.apache.org/jira/browse/COUCHDB-1009?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13139626#comment-13139626
] 

Filipe Manana commented on COUCHDB-1009:
----------------------------------------

Thanks for reminding about this Jan.

Regarding your question, no it's not needed. For each attachment we write, we instantiate
a couch_stream gen_server, which is then closed after writing the attachment. Therefore once
the .ini parameter is updated, it only affects subsequent attachment writes. I think this
is perfectly fine.
                
> Make couch_stream buffer configurable
> -------------------------------------
>
>                 Key: COUCHDB-1009
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-1009
>             Project: CouchDB
>          Issue Type: Improvement
>          Components: Database Core
>         Environment: trunk
>            Reporter: Filipe Manana
>            Assignee: Filipe Manana
>            Priority: Trivial
>         Attachments: COUCHDB-1009-2.patch, COUCHDB-1009-rebased.patch, COUCHDB-1009.patch
>
>
> The couch_stream buffer is hardcoded to 4Kb.
> This value should be configurable. Larger values can improve write and specially read
performance (if we write larger chunks to disk, we have higher chances of reading more contiguous
disk blocks afterwards). 
> I also think it's a good idea to change the default value from 4Kb to something higher
(64Kb for e.g.).
> Patch attached

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