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From "Paul Joseph Davis (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (COUCHDB-1342) Asynchronous file writes
Date Thu, 17 Nov 2011 01:59:51 GMT

    [ https://issues.apache.org/jira/browse/COUCHDB-1342?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13151734#comment-13151734
] 

Paul Joseph Davis commented on COUCHDB-1342:
--------------------------------------------

Also, I'd point out that I've not so much as implied that this patch shouldn't go in. The
patch came to JIRA, I reviewed it and I've been trying to discuss the technical aspects of
this patch. Somehow that got dragged off into the weeds about voting and other silly things.
I'd prefer if we could avoid spending time squabbling like raccoons in a dumpster. There's
a good idea here and we should be spending our time working on the engineering to make it
happen.
                
> 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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