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From "Randall Leeds (JIRA)" <j...@apache.org>
Subject [jira] Created: (COUCHDB-786) Make fewer gen_server calls to fsync the db header
Date Fri, 04 Jun 2010 23:06:54 GMT
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: 0.11, 0.10.2
            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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