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@ -1801,3 +1801,275 @@ TIP 5: Have you checked our extensive FAQ? |
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http://www.postgresql.org/users-lounge/docs/faq.html |
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From pgsql-hackers-owner+M16317=candle.pha.pa.us=pgman@postgresql.org Thu Dec 6 10:11:27 2001 |
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Return-path: <pgsql-hackers-owner+M16317=candle.pha.pa.us=pgman@postgresql.org> |
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Received: from west.navpoint.com (west.navpoint.com [207.106.42.13]) |
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by candle.pha.pa.us (8.11.6/8.10.1) with ESMTP id fB6FBQZ28795 |
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for <pgman@candle.pha.pa.us>; Thu, 6 Dec 2001 10:11:26 -0500 (EST) |
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for <pgman@candle.pha.pa.us>; Thu, 6 Dec 2001 10:11:25 -0500 (EST) |
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for <pgman@candle.pha.pa.us>; Thu, 6 Dec 2001 09:08:01 -0600 (CST) |
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(envelope-from pgsql-hackers-owner+M16317=candle.pha.pa.us=pgman@postgresql.org) |
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Received: from tiger.tigrasoft (fw.tigrasoft.hu [195.70.42.161]) |
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by postgresql.org (8.11.3/8.11.4) with ESMTP id fB5JWMm92521; |
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Wed, 5 Dec 2001 14:32:26 -0500 (EST) |
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(envelope-from hornyakl@freemail.hu) |
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Received: from freemail.hu ([192.168.0.200]) |
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by tiger.tigrasoft (8.9.3/8.9.3/Debian 8.9.3-21) with ESMTP id UAA20333; |
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Wed, 5 Dec 2001 20:30:51 +0100 |
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X-Authentication-Warning: tiger.tigrasoft: Host [192.168.0.200] claimed to be freemail.hu |
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Message-ID: <3C0E77F0.5030904@freemail.hu> |
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Date: Wed, 05 Dec 2001 20:39:28 +0100 |
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From: Laszlo Hornyak <hornyakl@freemail.hu> |
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Reply-To: hornyakl@users.sourceforge.net |
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User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:0.9.4) Gecko/20010913 |
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X-Accept-Language: hu, en-us |
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MIME-Version: 1.0 |
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To: Barry Lind <barry@xythos.com>, pgsql-hackers@postgresql.org, |
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pgsql-jdbc@postgresql.org |
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Subject: Re: [HACKERS] [GENERAL] java stored procedures |
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References: <3C074DE4.9040905@freemail.hu> <3C0BE325.3020809@xythos.com> <3C0C937E.9000405@freemail.hu> <3C0CFD82.1030600@xythos.com> <3C0D219C.1090804@freemail.hu> <3C0D799D.4010808@xythos.com> <3C0DE382.1050400@freemail.hu> <3C0E5A23.7060701@xythos.com> |
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Content-Type: text/plain; charset=us-ascii; format=flowed |
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Content-Transfer-Encoding: 7bit |
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Precedence: bulk |
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Sender: pgsql-hackers-owner@postgresql.org |
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Status: OR |
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Barry Lind wrote: |
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> |
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> I also stopped cc'ing the general list, since this is getting too |
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> detailed for most of the members on that list. |
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Ok. |
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> Now to your mail: |
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> |
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> This seems like a reasonable approach and should work across different |
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> JVMs. It would probably be a good experiment to try this with the Sun |
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> or IBM jvm at some point to verify. What I was afraid of was that you |
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> were hacking the Kaffe code to perform the integration which would |
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> limit this solution to only using Kaffe. |
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I am sure they wont work the same way. I think I have a sun jdk 1.3.0-2, |
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so I will try to port it soon. The IBM implementation must wait I think |
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until january. |
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> |
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> Just a suggestion: PL/J might be a good name, since as you probably |
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> know it can't be called pl/java because of the trademark restrictions |
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> on the word 'java'. |
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Ok, you won, I do not read the licenses. From now it`s name is pl/j. |
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Isn`t 'j' too short for the name of the process that runns java? :) |
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> |
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> I am a little concerned about the stability and complexity of having |
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> this '-pizza' program be responsible for handling the calls on the |
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> java side. My concern is that this will need to be a multithreaded |
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> program since multiple backends will concurrently be needing to |
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> interact with multiple java threads through this one program. It |
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> might be simpler if each postgres process directly communicated to a |
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> java thread via a tcpip socket. Then the "-pizza" program would only |
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> need to be responsible for starting up the jvm and creating java |
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> threads and sockets for a postgres process (it would perform a similar |
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> role to postmaster for postgres client connections). |
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With good design we can solve stability problems. As much as I know, if |
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postmaster dies, the postgres server becomes unavailable, this looks the |
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same problem. I do not know if we realy need sockets. Anyway, if 'j' |
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dies, we can create a new one, and restart calculations. Some watchdog |
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functionality... |
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Doing thing with sockets need a lot of rework. It is the best time for |
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this, while there is not too much thing done. |
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>>> |
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>>>> -when java thread receives the signal, it reads the message(s) from |
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>>>> the queue, and starts some actions. When done it tells postgres |
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>>>> with a signal that it is ready, and it can come for its results. |
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>>>> This will be rewritten see below problems. |
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>>> |
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>>> Are signals the best way to accomplish this? |
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>> |
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>> I don`t know if it is the best, it is the only way I know :) |
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>> Do you know any other ways? |
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>> |
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> I don't know, but hopefully someone on the hackers list will chip in |
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> here with a comment. |
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After a first developement cycle (if my brain doesn`t burn down), the |
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signals can be replaced to a plugable communication interface I think. |
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So maybe we can use CORBA, or sockets, or something else. This will take |
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a lot of time. |
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> OK, so the same backend process that called the function gets messaged |
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> to process the sql. This should work. However it means you will need |
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> a special version of the jdbc driver that uses this shm+signals |
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> communication mechanism instead of what the current jdbc driver does. |
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> This is something I would be happy to help you with. |
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This is kind of you. :) |
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For this, I will have to finish the protocol of communication. I have to |
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learn Postgres enough, so I am not sure this will be done this weekend. |
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I have ideas, only time is needed to implement them or to recognize the |
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failures. |
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Thanks, |
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Laszlo Hornyak |
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---------------------------(end of broadcast)--------------------------- |
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TIP 4: Don't 'kill -9' the postmaster |
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From pgsql-hackers-owner+M16313=candle.pha.pa.us=pgman@postgresql.org Thu Dec 6 10:01:29 2001 |
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Return-path: <pgsql-hackers-owner+M16313=candle.pha.pa.us=pgman@postgresql.org> |
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Received: from west.navpoint.com (west.navpoint.com [207.106.42.13]) |
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by candle.pha.pa.us (8.11.6/8.10.1) with ESMTP id fB6F1RZ28000 |
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for <pgman@candle.pha.pa.us>; Thu, 6 Dec 2001 10:01:27 -0500 (EST) |
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Received: from rs.postgresql.org (server1.pgsql.org [64.39.15.238] (may be forged)) |
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by west.navpoint.com (8.11.6/8.10.1) with ESMTP id fB6F1OE19111 |
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for <pgman@candle.pha.pa.us>; Thu, 6 Dec 2001 10:01:25 -0500 (EST) |
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Received: from postgresql.org (postgresql.org [64.49.215.8]) |
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by rs.postgresql.org (8.11.6/8.11.6) with ESMTP id fB6EvtR54729 |
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for <pgman@candle.pha.pa.us>; Thu, 6 Dec 2001 08:59:16 -0600 (CST) |
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(envelope-from pgsql-hackers-owner+M16313=candle.pha.pa.us=pgman@postgresql.org) |
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Received: from tiger.tigrasoft (fw.tigrasoft.hu [195.70.42.161]) |
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by postgresql.org (8.11.3/8.11.4) with ESMTP id fB6EFfm64066; |
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Thu, 6 Dec 2001 09:15:41 -0500 (EST) |
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(envelope-from hornyakl@freemail.hu) |
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Received: from freemail.hu ([192.168.0.200]) |
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by tiger.tigrasoft (8.9.3/8.9.3/Debian 8.9.3-21) with ESMTP id PAA29094; |
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Thu, 6 Dec 2001 15:15:01 +0100 |
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X-Authentication-Warning: tiger.tigrasoft: Host [192.168.0.200] claimed to be freemail.hu |
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Message-ID: <3C0F7F6B.2060605@freemail.hu> |
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Date: Thu, 06 Dec 2001 15:23:39 +0100 |
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From: Laszlo Hornyak <hornyakl@freemail.hu> |
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Reply-To: hornyakl@users.sourceforge.net |
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User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:0.9.4) Gecko/20010913 |
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X-Accept-Language: hu, en-us |
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MIME-Version: 1.0 |
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To: Gunnar =?ISO-8859-1?Q?R=F8nning?= <gunnar@polygnosis.com> |
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cc: Barry Lind <barry@xythos.com>, pgsql-hackers@postgresql.org, |
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pgsql-jdbc@postgresql.org |
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Subject: Re: [HACKERS] [GENERAL] java stored procedures |
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References: <3C074DE4.9040905@freemail.hu> <3C0BE325.3020809@xythos.com> <3C0C937E.9000405@freemail.hu> <3C0CFD82.1030600@xythos.com> <m2zo4wttp1.fsf@smaug.polygnosis.com> |
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Content-Type: text/plain; charset=ISO-8859-1; format=flowed |
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Content-Transfer-Encoding: 8bit |
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Precedence: bulk |
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Sender: pgsql-hackers-owner@postgresql.org |
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Status: OR |
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Hi! |
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Sorry, I have time only for short ansvers, it is company time :((. |
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Gunnar Rønning wrote: |
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>* Barry Lind <barry@xythos.com> wrote: |
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>| |
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>| possible problems with your strategy). Without knowing what exactly |
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>| you are thinking of doing it is difficult to comment. |
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> |
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>Agreed. |
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> |
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Ok, I will try to bring the code here before Monday, or at least some |
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pieces. It is full of hardcoded constants from my developement |
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environment. :( |
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> |
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>| I am very interested in hearing what your plans are for pl/java. I |
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>| think this is a very difficult project, but one that would be very |
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>| useful and welcome. |
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> |
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>I would very much like to hear about the plans myself. |
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> |
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I do not see so big difficulities yet, am I so lame? It won`t be easy, |
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realy, we should keep it simple, at least becouse of me. |
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thanks, |
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Laszlo Hornyak |
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---------------------------(end of broadcast)--------------------------- |
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TIP 3: if posting/reading through Usenet, please send an appropriate |
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subscribe-nomail command to majordomo@postgresql.org so that your |
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message can get through to the mailing list cleanly |
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From pgsql-hackers-owner+M16334=candle.pha.pa.us=pgman@postgresql.org Thu Dec 6 16:11:23 2001 |
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Return-path: <pgsql-hackers-owner+M16334=candle.pha.pa.us=pgman@postgresql.org> |
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Received: from west.navpoint.com (west.navpoint.com [207.106.42.13]) |
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by candle.pha.pa.us (8.11.6/8.10.1) with ESMTP id fB6LBLZ25078 |
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for <pgman@candle.pha.pa.us>; Thu, 6 Dec 2001 16:11:22 -0500 (EST) |
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Received: from rs.postgresql.org (server1.pgsql.org [64.39.15.238] (may be forged)) |
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by west.navpoint.com (8.11.6/8.10.1) with ESMTP id fB6LBMa12305 |
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for <pgman@candle.pha.pa.us>; Thu, 6 Dec 2001 16:11:22 -0500 (EST) |
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Received: from postgresql.org (postgresql.org [64.49.215.8]) |
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by rs.postgresql.org (8.11.6/8.11.6) with ESMTP id fB6L6wR66812 |
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for <pgman@candle.pha.pa.us>; Thu, 6 Dec 2001 15:08:01 -0600 (CST) |
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(envelope-from pgsql-hackers-owner+M16334=candle.pha.pa.us=pgman@postgresql.org) |
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Received: from rh72.home.ee (adsl895.estpak.ee [213.168.23.133]) |
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by postgresql.org (8.11.3/8.11.4) with ESMTP id fB6Kxtm98840; |
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Thu, 6 Dec 2001 15:59:55 -0500 (EST) |
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(envelope-from hannu@tm.ee) |
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Received: from tm.ee (localhost.localdomain [127.0.0.1]) |
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by rh72.home.ee (8.11.6/8.11.6) with ESMTP id fB6I2pn02024; |
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Thu, 6 Dec 2001 23:02:52 +0500 |
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Message-ID: <3C0FB2CB.90901@tm.ee> |
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Date: Thu, 06 Dec 2001 23:02:51 +0500 |
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From: Hannu Krosing <hannu@tm.ee> |
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User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:0.9.4) Gecko/20011019 Netscape6/6.2 |
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MIME-Version: 1.0 |
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To: hornyakl@users.sourceforge.net |
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cc: Gunnar =?ISO-8859-1?Q?R=F8nning?= <gunnar@polygnosis.com>, |
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Barry Lind |
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<barry@xythos.com>, pgsql-hackers@postgresql.org, |
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pgsql-jdbc@postgresql.org |
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Subject: Re: [HACKERS] [GENERAL] java stored procedures |
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References: <3C074DE4.9040905@freemail.hu> <3C0BE325.3020809@xythos.com> <3C0C937E.9000405@freemail.hu> <3C0CFD82.1030600@xythos.com> <m2zo4wttp1.fsf@smaug.polygnosis.com> <3C0F7F6B.2060605@freemail.hu> |
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Content-Type: text/plain; charset=us-ascii; format=flowed |
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Content-Transfer-Encoding: 7bit |
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Precedence: bulk |
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Sender: pgsql-hackers-owner@postgresql.org |
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Status: OR |
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Laszlo Hornyak wrote: |
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>> |
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>> | I am very interested in hearing what your plans are for pl/java. I |
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>> | think this is a very difficult project, but one that would be very |
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>> | useful and welcome. |
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>> |
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>> I would very much like to hear about the plans myself. |
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> |
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> I do not see so big difficulities yet, am I so lame? It won`t be easy, |
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> realy, we should keep it simple, at least becouse of me. |
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Let me propose a very different approach to PL/J - use gcc-java and |
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figure out the problems |
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with (dynamic) compiling and dynamic linking. |
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This is an approach somewhat similar to .NET/C# that you first compile |
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things and then run instead |
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of trying to do both at the same time ;) |
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Oracle /may/ be doing something similar with their java stored |
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procedures, as they claim these to be "compiled". |
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----------------- |
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Hannu |
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---------------------------(end of broadcast)--------------------------- |
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TIP 3: if posting/reading through Usenet, please send an appropriate |
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subscribe-nomail command to majordomo@postgresql.org so that your |
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message can get through to the mailing list cleanly |
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Bruce Momjian
24 years ago