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From "Paul Joseph Davis (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (COUCHDB-2000) couch_file upgrade
Date Mon, 24 Feb 2014 17:32:20 GMT

     [ https://issues.apache.org/jira/browse/COUCHDB-2000?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Paul Joseph Davis resolved COUCHDB-2000.
----------------------------------------

    Resolution: Duplicate

Oops. Accidentally created a duplicate of this one. There's more discussion on COUCHDB-2097
so I'm closing this in favor of that one.

> couch_file upgrade
> ------------------
>
>                 Key: COUCHDB-2000
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-2000
>             Project: CouchDB
>          Issue Type: Improvement
>          Components: BigCouch
>            Reporter: Volker Mische
>
> The revert to remove the second updater_fd from each #db{} record
> means that we’re back in the original position of files appearing to
> slow down significantly under load. Since the initial hammer approach
> of just adding a second fd we’ve since discovered that the underlying
> bug is due to the way that message passing works combined with
> Erlang’s file io. Significantly though is the fact that the fix is
> rather simple to implement. A first draft of this work is on an old
> branch of Paul Davis here:
>   https://github.com/davisp/couchdb/commit/d856878



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