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Re: [propel-dev] r/w splitting in master-slave db replication environment

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Author Christian Abegg <abegg dot ch at gmail dot com>
Full name Christian Abegg <abegg dot ch at gmail dot com>
Date 2007-11-18 08:59:06 PST
Message hi cameron, dear devs

thank you for your reply. i made a first try to implement it the way you
proposed:
- the propel class initializes a PropelPDO object which acts as db
connection to the master server
- the PropelPDO object also holds an array of other PDO connections used for
read only queries

pro: realtively simple to implement, building up on the existing code
contra: PropelPDO extending PDO is no more used as a singe db connection

have a look at the two patches attached. they are a very first draft showing
the way I would choose.
http://www.nabble.co​m/file/p13820966/Pro​pel.diff Propel.diff
http://www.nabble.co​m/file/p13820966/Pro​pelPDO.diff PropelPDO.diff

please let me know if you'd appreciate any further work on that matter and
if there are architectural changes/constraints to be considered.

cheers
christian


Cameron Brunner wrote:
>
> There is no reason this cant be done purely by slotting in a new
> PropelPDO layer with intelligence on what to send the query to IMO. I
> have thought this out before and it shouldn't be too painful depending
> upon just how smart you want it.
>
> On 11/3/07, Christian Abegg <abegg dot ch at gmail dot com> wrote:
>> hi
>>
>> i'd like to use my propel app in an environment where the db-master is
>> replicated to one or more slave databases. the master gets the writing
>> statements, the slave gets the reading statements.
>>
>> in my opinion, the propel layer would be appropriate implement that
>> function.
>>
>> as far as i see, there is no such feature in propel.
>>
>> after a short look into the generated base-classes, it seems like a
>> quite an easy task to implement a read-write splitting. assuming that
>> all reading queries call the "doSelectStmt" function, i'd introduce the
>> DATABASE_NAME_READ-constant which points to the configuration of the
>> slave-db.
>>
>> for load balancing between multiple slave-db's i'd use the mysql-proxy.
>> but a simple round robin mechanism could be implemented in propel as
>> well.
>>
>> i'm not sure wheter this approach could solve my problem. a big question
>> is: are the connection objects cached by propel? or is the $con-variable
>> always null if the user doesn't give a connection on the application
>> layer?
>>
>> if that enhancement is considered usefull and could be implemented
>> within reasonable time, i'd be glad to help.
>>
>> christian abegg
>>
>>
>> ps: my attempts to add an enhancement ticket failed beacaus they were
>> rejected as spam by trac.
>>
>> --------------------​--------------------​--------------------​---------
>> To unsubscribe, e-mail: dev-unsubscribe@prop​el.tigris.org
>> For additional commands, e-mail: dev-help at propel dot tigris dot org
>>
>>
>
>
> --
> Cameron Brunner
>
> Want a better web browser?
> http://www.spreadfir​efox.com/?q=affiliat​es&id=182780​&t=1
>
> --------------------​--------------------​--------------------​---------
> To unsubscribe, e-mail: dev-unsubscribe@prop​el.tigris.org
> For additional commands, e-mail: dev-help at propel dot tigris dot org
>
>
>

--
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r/w splitting in master-slave db replication environment Christian Abegg <abegg dot ch at gmail dot com> Christian Abegg <abegg dot ch at gmail dot com> 2007-11-02 13:09:28 PDT
     Re: [propel-dev] r/w splitting in master-slave db replication environment Cameron Brunner <cameron dot brunner at gmail dot com> Cameron Brunner <cameron dot brunner at gmail dot com> 2007-11-02 17:23:10 PDT
         Re: [propel-dev] r/w splitting in master-slave db replication environment Christian Abegg <abegg dot ch at gmail dot com> Christian Abegg <abegg dot ch at gmail dot com> 2007-11-18 08:59:06 PST
             Re: [propel-dev] r/w splitting in master-slave db replication environment Christian Abegg <abegg dot ch at gmail dot com> Christian Abegg <abegg dot ch at gmail dot com> 2007-12-02 06:26:12 PST
                 Re: [propel-dev] r/w splitting in master-slave db replication environment hlellelid Hans Lellelid 2007-12-02 17:22:35 PST
                     Re: [propel-dev] r/w splitting in master-slave db replication environment Christian Abegg <abegg dot ch at gmail dot com> Christian Abegg <abegg dot ch at gmail dot com> 2007-12-02 23:29:59 PST
                         Re: [propel-dev] r/w splitting in master-slave db replication environment hlellelid Hans Lellelid 2007-12-03 03:54:52 PST
                         Re: Re: [propel-dev] r/w splitting in master-slave db replication environment Moritz Mertinkat <moritz at mertinkat dot net> Moritz Mertinkat <moritz at mertinkat dot net> 2007-12-04 06:48:31 PST
                             Re: Re: [propel-dev] r/w splitting in master-slave db replication environment Pedram Nimreezi <zenstyle at gmail dot com> Pedram Nimreezi <zenstyle at gmail dot com> 2007-12-04 07:40:31 PST
                             Re: [propel-dev] r/w splitting in master-slave db replication environment Shane Langley <shane dot langley at gmail dot com> Shane Langley <shane dot langley at gmail dot com> 2007-12-04 11:40:14 PST
                                 Re: [propel-dev] r/w splitting in master-slave db replication environment Moritz Mertinkat <moritz at mertinkat dot net> Moritz Mertinkat <moritz at mertinkat dot net> 2007-12-04 12:11:38 PST
                                     Re: [propel-dev] r/w splitting in master-slave db replication environment Shane Langley <shane dot langley at gmail dot com> Shane Langley <shane dot langley at gmail dot com> 2007-12-04 12:48:15 PST
                                         Re: [propel-dev] r/w splitting in master-slave db replication environment hlellelid Hans Lellelid 2007-12-04 13:22:07 PST
                                             Re: [propel-dev] r/w splitting in master-slave db replication environment Christian Abegg <abegg dot ch at gmail dot com> Christian Abegg <abegg dot ch at gmail dot com> 2007-12-10 13:50:26 PST
                                         Re: [propel-dev] r/w splitting in master-slave db replication environment Moritz Mertinkat <moritz at mertinkat dot net> Moritz Mertinkat <moritz at mertinkat dot net> 2007-12-04 13:24:16 PST
                                             Re: [propel-dev] r/w splitting in master-slave db replication environment hlellelid Hans Lellelid 2008-01-04 05:57:21 PST
                                                 Re: [propel-dev] r/w splitting in master-slave db replication environment Christian Abegg <abegg dot ch at gmail dot com> Christian Abegg <abegg dot ch at gmail dot com> 2008-01-06 00:45:46 PST
                                                     Re: [propel-dev] r/w splitting in master-slave db replication environment hlellelid Hans Lellelid 2008-01-06 06:31:58 PST
                                                 Re: [propel-dev] r/w splitting in master-slave db replication environment =?ISO-8859-1?Q?David_Z=FClke?= <dz at bitxtender dot com> =?ISO-8859-1?Q?David_Z=FClke?= <dz at bitxtender dot com> 2008-01-07 06:46:19 PST
                                                     Re: [propel-dev] r/w splitting in master-slave db replication environment hlellelid Hans Lellelid 2008-01-07 06:47:37 PST
                                                         Re: [propel-dev] r/w splitting in master-slave db replication environment =?ISO-8859-1?Q?David_Z=FClke?= <dz at bitxtender dot com> =?ISO-8859-1?Q?David_Z=FClke?= <dz at bitxtender dot com> 2008-01-07 07:56:22 PST
                                                             Re: [propel-dev] r/w splitting in master-slave db replication environment hlellelid Hans Lellelid 2008-01-07 07:56:27 PST
                                                                 Re: [propel-dev] r/w splitting in master-slave db replication environment =?ISO-8859-1?Q?David_Z=FClke?= <dz at bitxtender dot com> =?ISO-8859-1?Q?David_Z=FClke?= <dz at bitxtender dot com> 2008-01-07 08:02:14 PST
                                                                     Re: [propel-dev] r/w splitting in master-slave db replication environment hlellelid Hans Lellelid 2008-01-07 08:06:02 PST
                                                                         Re: [propel-dev] r/w splitting in master-slave db replication environment =?ISO-8859-1?Q?David_Z=FClke?= <dz at bitxtender dot com> =?ISO-8859-1?Q?David_Z=FClke?= <dz at bitxtender dot com> 2008-01-07 08:32:56 PST
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