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Date: Mon, 1 Jun 2009 13:01:07 -0700 (PDT)
From: "Damien Katz (JIRA)" <jira@apache.org>
To: dev@couchdb.apache.org
Subject: [jira] Commented: (COUCHDB-204) CouchDB stops/crashes/hangs (?)
 after resume from Mac OS X system hibernation and/or stand-by ("sleep")
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    [ https://issues.apache.org/jira/browse/COUCHDB-204?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12715223#action_12715223 ] 

Damien Katz commented on COUCHDB-204:
-------------------------------------

It looks like all we need is a special flag passed to the emulator http://www.erlang.org/doc/man/erl.html:

+c
Disable compensation for sudden changes of system time.
Normally, erlang:now/0 will not immediately reflect sudden changes in the system time, in order to keep timers (including receive-after) working. Instead, the time maintained by erlang:now/0 is slowly adjusted towards the new system time. (Slowly means in one percent adjustments; if the time is off by one minute, the time will be adjusted in 100 minutes.)
When the +c option is given, this slow adjustment will not take place. Instead erlang:now/0 will always reflect the current system time. Note that timers are based on erlang:now/0. If the system time jumps, timers then time out at the wrong time.


> CouchDB stops/crashes/hangs (?) after resume from Mac OS X system hibernation and/or stand-by ("sleep")
> -------------------------------------------------------------------------------------------------------
>
>                 Key: COUCHDB-204
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-204
>             Project: CouchDB
>          Issue Type: Bug
>          Components: Administration Console, Database Core, HTTP Interface, Infrastructure
>    Affects Versions: 0.8.1
>         Environment: Mac OS X 10.5.6 "Leopard"
>            Reporter: Philipp Schumann
>            Priority: Critical
>
> I'm running CouchDB 0.8.1 on Mac OS X 10.5.6 "Leopard" and after resuming from system hibernation ("safe sleep" -- by closing and reopening the laptop lid in my case, which is the factory default), the process either refuses all incoming connections, including my own Python scripts, web browser and the Futon, or has stopped running altogether. That is, I don't know which exactly is the case here but the fact is that CouchDB cannot be connected to after resuming.
> This issue always appears with "smart sleep / safe sleep" (standby plus hibernation) but only sometimes appears using "fast sleep" (hibernation turned off, standby only).
> This isn't a "critical" issue for server deployments, of course, but one of the core ideas of CouchDB is that eventually it will be deployed even to desktop clients for app & data replication across machines, so in this context this *is* a critical issue since you can't ask "ordinary" Mac OS X users to change their sleep settings from "safe" to "fast" using uncomprehensable terminal commands.

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