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Posted to user@couchdb.apache.org by Wout Mertens <wm...@cisco.com> on 2010/09/13 14:19:21 UTC
Curious: will CouchDB ever allow live code updates?
Hi,
one of the benefits of Erlang is that you can upgrade your code while it's still running. CouchDB's MVCC should help with that as well.
So I wonder: Will CouchDB ever make use of that Erlang feature?
Wout.
Re: Curious: will CouchDB ever allow live code updates?
Posted by Wout Mertens <wo...@gmail.com>.
Ok that is seriously awesome. Unfortunately I have no idea how to tell the system to reload things... Any pointers?
Thanks :-)
Wout.
On Sep 13, 2010, at 18:10 , Adam Kocoloski wrote:
> Yes, BigCouch patched a few things to make hot code reloading less painful. To make this work for some modules in vanilla CouchDB you really only need a way to tell the system to reload a module. It could be an HTTP handler that does this, or you could run a named Erlang node by hacking the startup script and connecting to it via a remsh.
>
> Adam
>
> On Sep 13, 2010, at 11:49 AM, Paul Davis wrote:
>
>> Its already possible. There are a couple known spots in trunk that
>> tend to barf on code reloading. IIUC, BigCouch comes with a couple
>> patches for some of these issues. If you find any others, feel free to
>> open issues in JIRA.
>>
>> HTH,
>> Paul Davis
>>
>> On Mon, Sep 13, 2010 at 8:19 AM, Wout Mertens <wm...@cisco.com> wrote:
>>> Hi,
>>>
>>> one of the benefits of Erlang is that you can upgrade your code while it's still running. CouchDB's MVCC should help with that as well.
>>>
>>> So I wonder: Will CouchDB ever make use of that Erlang feature?
>>>
>>> Wout.
>
Re: Curious: will CouchDB ever allow live code updates?
Posted by Adam Kocoloski <ko...@apache.org>.
Yes, BigCouch patched a few things to make hot code reloading less painful. To make this work for some modules in vanilla CouchDB you really only need a way to tell the system to reload a module. It could be an HTTP handler that does this, or you could run a named Erlang node by hacking the startup script and connecting to it via a remsh.
Adam
On Sep 13, 2010, at 11:49 AM, Paul Davis wrote:
> Its already possible. There are a couple known spots in trunk that
> tend to barf on code reloading. IIUC, BigCouch comes with a couple
> patches for some of these issues. If you find any others, feel free to
> open issues in JIRA.
>
> HTH,
> Paul Davis
>
> On Mon, Sep 13, 2010 at 8:19 AM, Wout Mertens <wm...@cisco.com> wrote:
>> Hi,
>>
>> one of the benefits of Erlang is that you can upgrade your code while it's still running. CouchDB's MVCC should help with that as well.
>>
>> So I wonder: Will CouchDB ever make use of that Erlang feature?
>>
>> Wout.
Re: Curious: will CouchDB ever allow live code updates?
Posted by Paul Davis <pa...@gmail.com>.
Its already possible. There are a couple known spots in trunk that
tend to barf on code reloading. IIUC, BigCouch comes with a couple
patches for some of these issues. If you find any others, feel free to
open issues in JIRA.
HTH,
Paul Davis
On Mon, Sep 13, 2010 at 8:19 AM, Wout Mertens <wm...@cisco.com> wrote:
> Hi,
>
> one of the benefits of Erlang is that you can upgrade your code while it's still running. CouchDB's MVCC should help with that as well.
>
> So I wonder: Will CouchDB ever make use of that Erlang feature?
>
> Wout.