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Date: Mon, 24 Feb 2014 17:32:20 +0000 (UTC)
From: "Paul Joseph Davis (JIRA)" <jira@apache.org>
To: dev@couchdb.apache.org
Message-ID: <JIRA.12684833.1387128681106.93290.1393263140284@arcas>
In-Reply-To: <JIRA.12684833.1387128681106@arcas>
References: <JIRA.12684833.1387128681106@arcas>
Subject: [jira] [Resolved] (COUCHDB-2000) couch_file upgrade
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     [ https://issues.apache.org/jira/browse/COUCHDB-2000?page=3Dcom.atlass=
ian.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=E2=80=99re 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=E2=80=99ve since discovered that the underl=
ying
> bug is due to the way that message passing works combined with
> Erlang=E2=80=99s file io. Significantly though is the fact that the fix i=
s
> 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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