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From "Robert Newson (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (COUCHDB-1342) Asynchronous file writes
Date Wed, 16 Nov 2011 22:09:51 GMT

    [ https://issues.apache.org/jira/browse/COUCHDB-1342?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13151567#comment-13151567
] 

Robert Newson commented on COUCHDB-1342:
----------------------------------------

Technical comments notwithstanding, saying "We won't be holding up this patch because it seems
more complicated than before. It's about what users want." is a little bold. As I understand
the Apache rules, if Paul feels strongly he can vote -1 which is a veto.

>From http://www.apache.org/foundation/voting.html:

"Votes on code modifications follow a different model. In this scenario, a negative vote constitutes
a veto , which cannot be overridden."

Any suggestion that one person can force in a controversial change to an Apache project needs
to be challenged.

                
> Asynchronous file writes
> ------------------------
>
>                 Key: COUCHDB-1342
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-1342
>             Project: CouchDB
>          Issue Type: Improvement
>          Components: Database Core
>            Reporter: Jan Lehnardt
>             Fix For: 1.3
>
>         Attachments: COUCHDB-1342.patch
>
>
> This change updates the file module so that it can do
> asynchronous writes. Basically it replies immediately
> to process asking to write something to the file, with
> the position where the chunks will be written to the
> file, while a dedicated child process keeps collecting
> chunks and write them to the file (and batching them
> when possible). After issuing a series of write request
> to the file module, the caller can call its 'flush'
> function which will block the caller until all the
> chunks it requested to write are effectively written
> to the file.
> This maximizes the IO subsystem, as for example, while
> the updater is traversing and modifying the btrees and
> doing CPU bound tasks, the writes are happening in
> parallel.
> Originally described at http://s.apache.org/TVu
> Github Commit: https://github.com/fdmanana/couchdb/commit/e82a673f119b82dddf674ac2e6233cd78c123554

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