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From davisp <>
Subject [GitHub] couchdb-couch pull request: 2322 fix couch proc manager limits
Date Fri, 05 Sep 2014 22:59:01 GMT
GitHub user davisp opened a pull request:

    2322 fix couch proc manager limits

    This fixes the couch_proc_manager limit counting by rearranging the increment and decrements
when processes are created and destroyed. It ensures that each time we remove a process from
the ets table that we decrement appropriately.
    For incrementing things are a bit more complicated in that we need to increment before
inserting to the table. This is so that our hard limit applies even if one of our asynchronous
spawn calls is opening a new process. This is accomplished by incrementing the counter and
storing the async open call information in a new ets table. If the open is successful the
counter is left untouched. If the open fails then we need to decrement the counter.
    This also simplifies starting waiting clients when a processes is either returned, exits,
or fails to start by isolating the logic and calling it in each place as necessary.

You can merge this pull request into a Git repository by running:

    $ git pull 2322-fix-couch-proc-manager-limits

Alternatively you can review and apply these changes as the patch at:

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #5
commit 28a7f57538b9dc7eb05d9c6e2ab2f275dd04ce35
Author: Paul J. Davis <>
Date:   2014-09-05T22:34:28Z

    Fix export declarations

commit a8263fe8d1c166a03a705847c224969440068c5e
Author: Paul J. Davis <>
Date:   2014-09-05T22:35:14Z

    Fix bugs with couch_proc_manager limits
    The merge left about three features in the couch_proc_manager at odds
    which ended up preventing the proper counting of live processes. This
    could and does lead to deadlocks as waiters are never provided a process
    for use.
    Closes COUCHDB-2321


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