[jira] [Updated] (COUCHDB-1009) Make couch_stream buffer configurable

["Jan Lehnardt (Updated) (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/COUCHDB-1009?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jan Lehnardt updated COUCHDB-1009:
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    Attachment: COUCHDB-1009-rebased.patch

Rebased against master.

@FIlipe, don't we need to listen to config changes and restart or reconfigure the gen_server or its state with the new config value?
                
> 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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