Make fewer gen_server calls to fsync the db header
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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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