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From "Volker Mische (JIRA)" <>
Subject [jira] [Created] (COUCHDB-2000) couch_file upgrade
Date Sun, 15 Dec 2013 17:33:07 GMT
Volker Mische created COUCHDB-2000:

             Summary: couch_file upgrade
                 Key: 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’re 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’ve since discovered that the underlying
bug is due to the way that message passing works combined with
Erlang’s file io. Significantly though is the fact that the fix is
rather simple to implement. A first draft of this work is on an old
branch of Paul Davis here:

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