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From "Randall Leeds (JIRA)" <j...@apache.org>
Subject [jira] Updated: (COUCHDB-786) Make fewer gen_server calls to fsync the db header
Date Fri, 04 Jun 2010 23:12:56 GMT

     [ https://issues.apache.org/jira/browse/COUCHDB-786?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

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

    Attachment:     (was: 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
>
>
> 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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