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Date: Fri, 4 Jun 2010 19:06:54 -0400 (EDT)
From: "Randall Leeds (JIRA)" <jira@apache.org>
To: dev@couchdb.apache.org
Subject: [jira] Updated: (COUCHDB-786) Make fewer gen_server calls to fsync
 the db header
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     [ https://issues.apache.org/jira/browse/COUCHDB-786?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Randall Leeds updated COUCHDB-786:
----------------------------------

    Attachment: 0001-db-header-fsync-with-fewer-gen_server-calls.patch

> Make fewer gen_server calls to fsync the db header
> --------------------------------------------------
>
>                 Key: COUCHDB-786
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-786
>             Project: CouchDB
>          Issue Type: Improvement
>          Components: Database Core
>    Affects Versions: 0.10.2, 0.11
>            Reporter: Randall Leeds
>             Fix For: 0.12
>
>         Attachments: 0001-db-header-fsync-with-fewer-gen_server-calls.patch
>
>
> Currently the couch_db_updater process is responsible for calling couch_file:sync based on the fsync options when the db header is written. Instead, this patch just passes the fsync options down to couch_file so that writing the header can always be performed with a single gen_server call.
> Writes are serialized through couch_db_updater but reads can have high concurrency. This patch should boost write performance when the message queue on couch_file is long.

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