2162 lines
109 KiB
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2162 lines
109 KiB
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From pgsql-hackers-owner+M49851=pgman=candle.pha.pa.us@postgresql.org Sat Feb 7 10:33:51 2004
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To: pgsql-hackers@postgresql.org
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From: Heikki Linnakangas <hlinnaka@iki.fi>
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Subject: [HACKERS] Two-phase commit
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Date: Wed, 4 Feb 2004 22:22:16 +0200
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Lines: 30
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version=2.61
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Status: ORr
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I've been very slowly continuing my work on two-phase commits for a couple
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months now, and I now have my original patch updated so that it applies to
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the current CVS tip, with some improvements.
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The patch introduces three new commands, PREPCOMMIT, COMMITPREPARED and
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ABORTPREPARED.
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To start a 2PC transaction, you first do a BEGIN and your updates as
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usual. At the end of the transaction, you call PREPCOMMIT 'foobar' instead
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of COMMIT. Now the transaction is in prepared state, ready to commit at a
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later time. 'foobar' is the global transaction identifier assigned for the
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transaction.
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Later, when you want to finish the second phase, you call
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COMMITPREPARED 'foobar';
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There is a system view pg_prepared_xacts that gives you all transactions
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that are in prepared state waiting for COMMITPREPARED or ABORTPREPARED.
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I have also done some work on XA-enabling the JDBC drivers, now that we
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have what it takes in the server side. I have succesfully executed
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2PC transactions with JBossMQ and Postgres, using JBoss as the
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transaction manager, so the basic stuff seems to be working.
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Please have a look and comment, the patches can be found here:
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http://www.iki.fi/hlinnaka/pgsql/
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What is the schedule for 7.5? Any chance of getting this in?
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- Heikki
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From pgsql-hackers-owner+M50166=pgman=candle.pha.pa.us@postgresql.org Sun Feb 15 14:10:46 2004
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Mon, 9 Feb 2004 22:09:34 +0200
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Date: Mon, 9 Feb 2004 22:09:34 +0200 (EET)
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From: Heikki Linnakangas <hlinnaka@iki.fi>
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To: "Jeroen T. Vermeulen" <jtv@xs4all.nl>
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cc: PostgreSQL Development <pgsql-hackers@postgresql.org>
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Subject: Re: [HACKERS] Two-phase commit
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In-Reply-To: <20040208195332.GE25140@xs4all.nl>
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Message-ID: <Pine.OSF.4.58.0402092201460.226205@kosh.hut.fi>
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References: <Pine.OSF.4.58.0402042200330.238747@kosh.hut.fi>
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<20040208195332.GE25140@xs4all.nl>
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version=2.61
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Status: OR
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On Sun, 8 Feb 2004, Jeroen T. Vermeulen wrote:
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> On Wed, Feb 04, 2004 at 10:22:16PM +0200, Heikki Linnakangas wrote:
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>
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> > There is a system view pg_prepared_xacts that gives you all transactions
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> > that are in prepared state waiting for COMMITPREPARED or ABORTPREPARED.
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>
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> Great to hear that you've gotten so far with this... One question: can I
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> check for this view to see if 2PC is supported before issuing the new
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> kind of commit? I'm interested in supporting 2PC even for some regular
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> transactions to reduce their in-doubt window, but I don't want to issue a
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> command at the last moment that may fail (and thereby abort) because the
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> backend version I'm connected to doesn't support the new command!
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Yes, I suppose that would work. Though you would have to use a query that
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wouldn't fail in case the view doesn't exist, otherwise you end up
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aborting the transaction anyway. This should work:
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SELECT COUNT(*) FROM pg_views WHERE schemanem='pg_catalog' AND viewname
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='pg_prepared_xacts'
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If it returns 1, you can do 2PC, if it returns 0, you have to regular
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commit.
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|
||
However, if this gets into 7.5, I guess you could just check for the
|
||
version of the backend instead with "SELECT version()".
|
||
|
||
- Heikki
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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+M49946=pgman=candle.pha.pa.us@postgresql.org Mon Feb 9 14:18:20 2004
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Date: Mon, 9 Feb 2004 21:56:30 +0100
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From: "Jeroen T. Vermeulen" <jtv@xs4all.nl>
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To: Heikki Linnakangas <hlinnaka@iki.fi>
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cc: PostgreSQL Development <pgsql-hackers@postgresql.org>
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Subject: Re: [HACKERS] Two-phase commit
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version=2.61
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Status: OR
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On Mon, Feb 09, 2004 at 10:09:34PM +0200, Heikki Linnakangas wrote:
|
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>
|
||
> However, if this gets into 7.5, I guess you could just check for the
|
||
> version of the backend instead with "SELECT version()".
|
||
|
||
Hey, that works? That's very good news, because I was getting a bit
|
||
worried about all the things I want to do in libpqxx that may depend on
|
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the Postgres version...
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Thanks!
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From pgsql-hackers-owner+M50540=pgman=candle.pha.pa.us@postgresql.org Sat Feb 28 14:40:52 2004
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Return-path: <pgsql-hackers-owner+M50540=pgman=candle.pha.pa.us@postgresql.org>
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From: Heikki Linnakangas <hlinnaka@iki.fi>
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Subject: Re: [HACKERS] Two-phase commit
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Date: Sun, 22 Feb 2004 04:26:56 +0200
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<200402080138.i181cPl15259@candle.pha.pa.us>
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Status: OR
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On Sat, 7 Feb 2004, Bruce Momjian wrote:
|
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|
||
> > Please have a look and comment, the patches can be found here:
|
||
> > http://www.iki.fi/hlinnaka/pgsql/
|
||
> >
|
||
> > What is the schedule for 7.5? Any chance of getting this in?
|
||
>
|
||
> 7.5 is certainly possible. We are months away from beta on 7.5 and I
|
||
> would like ot see two-phase commit included. One item that has come up
|
||
> in past discussions is a way of recording two-phase commit failures to
|
||
> the administrator in cases where you precommit, get a reply, commit,
|
||
> then the remote machine disappears.
|
||
|
||
You would resolve this by opening a new session, and checking if the gid
|
||
you specified in PREPARE TRANSACTION is still present in the
|
||
pg_prepared_xacts view. It could be done manually by the administrator, or
|
||
it could be done automatically by an external transaction manager if
|
||
there is one.
|
||
|
||
The XA interface specifies a function called "recover", that gives you a
|
||
list of pending transactions. If we some day have an XA implementation,
|
||
the recover call would map directly to "SELECT gid FROM
|
||
pg_prepared_xacts". The JDBC XA implementation that I'm working on does
|
||
that already.
|
||
|
||
I have updated my patches, see the URL above. I renamed the commands to
|
||
PREPARE TRANSACTION, COMMIT PREPARED and ROLLBACK PREPARED. I think it's
|
||
more coherent that way.
|
||
|
||
I also added documentation entries for the commands, and a basic
|
||
regression test.
|
||
|
||
I went through all the AtCommit_* and AtEOXact* hooks in xact.c to find
|
||
any possible problem areas. The following items have not yet been
|
||
implemented and throw an error if you try to do 2PC in the same
|
||
transaction.
|
||
|
||
* Notifications (NOTIFY/LISTEN). All pending notifications should be
|
||
stored in persistent storage in the prepare phase, and sent in the commit
|
||
phase.
|
||
|
||
* Creation/deletion of relations. I couldn't figure out how the relation
|
||
cache invalidation stuff should work with 2PC.
|
||
|
||
* Modifying GUC variables. I need to study the GUC code more thoroughly
|
||
before I can tell what needs to be done.
|
||
|
||
* Updates to shadow/group files, that is, CREATE USER and friends. Needs
|
||
some tricks to delay the writing of pg_pwd/pg_group.
|
||
|
||
* Large objects. AFAICS, no particular problem here, but I'd like to deal
|
||
with them later when the more important stuff are ok.
|
||
|
||
Plus a couple of minor details:
|
||
|
||
* Temporary tables. The seem to work somehow, but I haven't tested them
|
||
much. I have a feeling that nasty things might happen if you commit the
|
||
prepared transaction from another backend etc.
|
||
|
||
* initdb gives a warning about a missing file. It's harmless, but I
|
||
don't see how to detect that you're running under initdb. Also, if you
|
||
try to prapare a transaction with a global transaction identifier that's
|
||
already in use, you first get a warning and then an error.
|
||
|
||
I'm going to tackle the above problems later, but I would like to get
|
||
this applied to the cvs trunk with the current functionality first, after
|
||
discussion of course. The rest are nice to have for the sake of
|
||
completeness but probably not necessary for most users.
|
||
|
||
- Heikki
|
||
|
||
|
||
---------------------------(end of broadcast)---------------------------
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TIP 5: Have you checked our extensive FAQ?
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|
||
http://www.postgresql.org/docs/faqs/FAQ.html
|
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|
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From pgsql-general-owner+M58726=pgman=candle.pha.pa.us@postgresql.org Fri Mar 19 01:00:58 2004
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Return-path: <pgsql-general-owner+M58726=pgman=candle.pha.pa.us@postgresql.org>
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Date: Fri, 19 Mar 2004 14:30:56 +0700
|
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From: David Garamond <lists@zara.6.isreserved.com>
|
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|
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To: Matthew Hixson <hixson@poindextrose.org>
|
||
cc: pgsql-general@postgresql.org
|
||
Subject: Re: [GENERAL] two phase commit
|
||
References: <68FB14C4-7963-11D8-B6BA-000A95D05926@poindextrose.org>
|
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In-Reply-To: <68FB14C4-7963-11D8-B6BA-000A95D05926@poindextrose.org>
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version=2.61
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Status: OR
|
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|
||
Matthew Hixson wrote:
|
||
> From what I can find with Google it looks like TPC might make it into
|
||
> Postgrs 7.5. I was wondering if there were any commercial products or
|
||
> open source projects that can provide TPC on top of Postgres. Or is
|
||
> this something that really needs to be handled by the database itself?
|
||
|
||
With the 2PC patch submitted, you can interface with it at the SQL level
|
||
(i.e. you prepare, commit, cancel prepare, etc. by issuing ordinary SQL
|
||
commands). This means it will be pretty trivial to make it work with
|
||
other components like TX manager, etc. For example, I'm guessing it will
|
||
be easy to add 2PC support to npgsql (.NET data provider).
|
||
|
||
PS: It's really nice to see Postgres coming along feature-wise. 2PC and
|
||
nested transaction (aside from native Windows port, of course) are the
|
||
main things Firebird has that Potsgres hasn't. After that, we can pretty
|
||
much leave FB in the dust... :-)
|
||
|
||
--
|
||
dave
|
||
|
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From pgsql-hackers-owner+M51632@postgresql.org Tue Mar 23 10:18:06 2004
|
||
Return-path: <pgsql-hackers-owner+M51632@postgresql.org>
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Received: from postgresql.org (svr1.postgresql.org [200.46.204.71])
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for <pgman@candle.pha.pa.us>; Tue, 23 Mar 2004 12:18:02 -0500 (EST)
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Tue, 23 Mar 2004 18:10:45 +0200
|
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Date: Tue, 23 Mar 2004 18:10:35 +0200 (EET)
|
||
From: Heikki Linnakangas <hlinnaka@iki.fi>
|
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X-X-Sender: hlinnaka@kosh.hut.fi
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To: pgsql-hackers@postgresql.org
|
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cc: pgsql-patches@postgresql.org
|
||
Subject: Re: [HACKERS] Two-phase commit
|
||
In-Reply-To: <Pine.OSF.4.58.0402220324250.126984@kosh.hut.fi>
|
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Message-ID: <Pine.OSF.4.58.0403231758350.513267@kosh.hut.fi>
|
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References: <Pine.OSF.4.58.0402042200330.238747@kosh.hut.fi>
|
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<200402080138.i181cPl15259@candle.pha.pa.us> <Pine.OSF.4.58.0402220324250.126984@kosh.hut.fi>
|
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--182774146-1920606540-1080058235=:513267
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||
Content-Type: TEXT/PLAIN; charset=US-ASCII
|
||
|
||
I have again updated my two-phase commit patches. Only minor
|
||
modifications.
|
||
|
||
I haven't received any comments and there hasn't been any discussion on
|
||
the implementation, I suppose that nobody has given it a try. :(
|
||
|
||
There is still some rough edges, but I think it's good enough as a first
|
||
cut. I personally consider it ready to be applied to cvs tip, but then
|
||
again I'm still a newbie :). Please take a look!
|
||
|
||
The patch is also available here: http://www.iki.fi/hlinnaka/pgsql/
|
||
|
||
- Heikki
|
||
--182774146-1920606540-1080058235=:513267
|
||
Content-Type: APPLICATION/x-gzip; name="twophase_20040321.diff.gz"
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--182774146-1920606540-1080058235=:513267
|
||
Content-Type: text/plain
|
||
Content-Disposition: inline
|
||
Content-Transfer-Encoding: 8bit
|
||
MIME-Version: 1.0
|
||
|
||
|
||
---------------------------(end of broadcast)---------------------------
|
||
TIP 9: the planner will ignore your desire to choose an index scan if your
|
||
joining column's datatypes do not match
|
||
|
||
--182774146-1920606540-1080058235=:513267--
|
||
|
||
From pgsql-hackers-owner+M51641@postgresql.org Tue Mar 23 11:32:25 2004
|
||
Return-path: <pgsql-hackers-owner+M51641@postgresql.org>
|
||
Received: from postgresql.org (svr1.postgresql.org [200.46.204.71])
|
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id 8877D5759D; Tue, 23 Mar 2004 13:28:43 -0500 (EST)
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Date: Tue, 23 Mar 2004 14:28:43 -0400
|
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From: Alvaro Herrera <alvherre@dcc.uchile.cl>
|
||
To: Heikki Linnakangas <hlinnaka@iki.fi>
|
||
cc: pgsql-hackers@postgresql.org
|
||
Subject: Re: [HACKERS] Two-phase commit
|
||
Message-ID: <20040323182843.GF3863@dcc.uchile.cl>
|
||
References: <Pine.OSF.4.58.0402042200330.238747@kosh.hut.fi> <200402080138.i181cPl15259@candle.pha.pa.us> <Pine.OSF.4.58.0402220324250.126984@kosh.hut.fi> <Pine.OSF.4.58.0403231758350.513267@kosh.hut.fi>
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Status: ORr
|
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|
||
On Tue, Mar 23, 2004 at 06:10:35PM +0200, Heikki Linnakangas wrote:
|
||
> I have again updated my two-phase commit patches. Only minor
|
||
> modifications.
|
||
>
|
||
> I haven't received any comments and there hasn't been any discussion on
|
||
> the implementation, I suppose that nobody has given it a try. :(
|
||
|
||
I haven't tried it, but I see it conflicts big time with my
|
||
modifications in access/transam/xact.c for subtransactions support.
|
||
|
||
I am currently writing a proposal for nested transactions which will go
|
||
to -hackers, and I will be posting some code to -patches shortly
|
||
thereafter which should give you an idea where I am heading. Maybe then
|
||
we can have the opinion from the devel community about both things,
|
||
whether they should be applied or not.
|
||
|
||
--
|
||
Alvaro Herrera (<alvherre[a]dcc.uchile.cl>)
|
||
"El miedo atento y previsor es la madre de la seguridad" (E. Burke)
|
||
|
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---------------------------(end of broadcast)---------------------------
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TIP 6: Have you searched our list archives?
|
||
|
||
http://archives.postgresql.org
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|
||
From jtv@xs4all.nl Tue Jun 29 10:18:43 2004
|
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Return-path: <jtv@xs4all.nl>
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(envelope-from jtv)
|
||
Date: Tue, 29 Jun 2004 16:18:38 +0200
|
||
From: "Jeroen T. Vermeulen" <jtv@xs4all.nl>
|
||
To: pgadmin@pse-consulting.de, Bruce Momjian <pgman@candle.pha.pa.us>
|
||
Subject: Two-phase commit
|
||
Message-ID: <20040629141837.GL56428@xs4all.nl>
|
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version=2.61
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Status: ORr
|
||
|
||
Hi Andreas, Bruce:
|
||
|
||
I briefly discussed this with both of you separately. The 2-phase-commit
|
||
patch that's being worked on has the shortcoming that the "supercommit"
|
||
is assumed to come over the same connection as the regular database
|
||
session, i.e. the transaction manager (the middleware that manages the
|
||
two-phase transaction across multibple databases etc.) also has to serve
|
||
as a proxy for the regular database session.
|
||
|
||
A "real" two-phase commit system has the two phases of the transaction
|
||
going over separate connections--one between application and database
|
||
server, one between middleware and database server. Andreas quite
|
||
sensibly asked me why; and the real answer only just popped back into
|
||
my head.
|
||
|
||
I think the real reason is the same reason why we want 2PC in the first
|
||
place. Connections may be lost _just_ when the middleware is sending out
|
||
second-phase commits to the various resource managers. In that case, it
|
||
is absolutely essential that the transaction manager be able to reconnect
|
||
to the resource manager (in this case, postgres) and continue where it
|
||
left off. A regular session can't do that, and that's exactly where the
|
||
2nd phase is being implemented right now.
|
||
|
||
The way the current patch does things is more like the Oracle model.
|
||
Oracle has a "prepare commit" command (which I think even makes more
|
||
sense for this approach than making things look like nested transactions).
|
||
However I'm told that Oracle builds on the assumption of a two-tier
|
||
system, and it doesn't work very well. If two-tier were good enough, then
|
||
I suspect you might as well use something like my robusttransaction class
|
||
which catches the special case of losing connection during commit, then
|
||
tries to reconnect and find out whether the commit went through or not.
|
||
|
||
As I mentioned to Bruce at FOSDEM last year, what I'd really need to get
|
||
that right (and the same goes for 2pc) I needed to be able to query the
|
||
transaction log in some way, to find out what happened to a transaction.
|
||
I've always assumed, and still believe, that what I did here was just a
|
||
hack to make the worst case a bit less likely. It's not what I would call
|
||
a solution to the atomicity problem.
|
||
|
||
On the other hand, of course, at least one traditional argument for 3-tier
|
||
setups doesn't apply to us: we don't need connection pooling on the
|
||
middleware just to keep the per-connection licensing cost down. :)
|
||
|
||
|
||
Jeroen
|
||
|
||
From pgsql-hackers-owner+M59934=pgman=candle.pha.pa.us@postgresql.org Tue Oct 12 15:27:20 2004
|
||
Return-path: <pgsql-hackers-owner+M59934=pgman=candle.pha.pa.us@postgresql.org>
|
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|
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Date: Thu, 7 Oct 2004 14:15:44 +0300 (EEST)
|
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From: Heikki Linnakangas <hlinnaka@iki.fi>
|
||
X-X-Sender: hlinnaka@kosh.hut.fi
|
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To: Tom Lane <tgl@sss.pgh.pa.us>
|
||
cc: Heikki Linnakangas <hlinnaka@iki.fi>, pgsql-hackers@postgresql.org
|
||
Subject: Re: [HACKERS] Two-phase commit
|
||
In-Reply-To: <354.1097099170@sss.pgh.pa.us>
|
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Message-ID: <Pine.OSF.4.61.0410071357420.432862@kosh.hut.fi>
|
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References: <Pine.OSF.4.58.0402042200330.238747@kosh.hut.fi>
|
||
<200402080138.i181cPl15259@candle.pha.pa.us> <Pine.OSF.4.58.0402220324250.126984@kosh.hut.fi>
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<Pine.OSF.4.58.0403231758350.513267@kosh.hut.fi> <354.1097099170@sss.pgh.pa.us>
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|
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version=2.61
|
||
Status: OR
|
||
|
||
On Wed, 6 Oct 2004, Tom Lane wrote:
|
||
|
||
> Quite some time ago, Heikki Linnakangas <hlinnaka@iki.fi> wrote:
|
||
>> I haven't received any comments and there hasn't been any discussion on
|
||
>> the implementation, I suppose that nobody has given it a try. :(
|
||
>
|
||
> I finally got around to taking a close look at this. There's a good bit
|
||
> undone, as you well know, but it seems like it can be the basis for a
|
||
> workable feature. I do have a few comments to make.
|
||
|
||
Great!
|
||
|
||
> At the API level, I like the PREPARE/COMMIT/ROLLBACK statements, but I
|
||
> think you have missed a bet in that it needs to be possible to issue
|
||
> "COMMIT PREPARED gid" for the same gid several times without error.
|
||
> Consider a scenario where the transaction monitor crashes during the
|
||
> commit phase. When it recovers, it will be aware that it had committed
|
||
> to commit, but it won't know which nodes were successfully committed.
|
||
> So it will need to resend the COMMIT commands. It would be bad for the
|
||
> nodes to simply say "yes boss" if they are told to COMMIT a gid they
|
||
> have no record of. So I think the gid's have to stick around after
|
||
> COMMIT PREPARED or ROLLBACK PREPARED, and there needs to be a fourth
|
||
> command (RELEASE PREPARED?) to actually remove the state data when the
|
||
> transaction monitor is satisfied that everything's done. RELEASE of
|
||
> an unknown gid is okay to be a no-op.
|
||
|
||
Hmm. I don't see a problem with the "yes boss" approach. Some kind of a
|
||
warning is appropriate, of course, but I don't see a reason for an
|
||
additional step. After all, you would still fall back to the "yes boss"
|
||
approach on the RELEASE PREPARED command.
|
||
|
||
The transaction monitor knows if the 1st phase succeeded or not, so if the
|
||
COMMIT PREPARED doesn't find the transaction anymore, the monitor knows
|
||
that it's previous commit/rollback succeeded.
|
||
|
||
> Implementation-wise, I really dislike storing the info in a shared hash
|
||
> table, because I don't see any reasonable bound on the size of the hash
|
||
> table (your existing code uses 100 which is about as arbitrary as it
|
||
> gets). Plus the actual content of each entry is not fixed-size either.
|
||
> This is not very workable given our fixed-size shared memory mechanism.
|
||
|
||
I fully agree, I'm very dissatisfied with that part.
|
||
|
||
> The idea that occurs to me instead is to not use WAL or shared memory at
|
||
> all for keeping the prepared-transaction state info. Instead, suppose
|
||
> that we store the status information in a file named after the GID,
|
||
> "$PGDATA/pg_twophase/gid". We could write the file with a CRC similarly
|
||
> to what's done for pg_control. Once such a file is written and fsync'd,
|
||
> it's equally as reliable as a WAL record would be, so it seems safe
|
||
> enough to me to report the PREPARE as done. COMMIT, ROLLBACK, and the
|
||
> pg_prepared_xacts system view would look into the pg_twophase directory
|
||
> to find out all about active prepared transactions; RELEASE PREPARED
|
||
> would simply delete the appropriate file. (Note: commit or rollback
|
||
> would need to take the transaction XID from the GID file and then look
|
||
> in pg_clog to find out if the transaction were already committed. These
|
||
> operations do not change the pg_twophase file, but they do write a
|
||
> normal transaction-commit or -abort WAL record and update pg_clog.)
|
||
|
||
That sounds like a clever idea! I thought about using a single file
|
||
myself, but the multi-file approach is much simpler.
|
||
|
||
> I think this would offer better performance as well as being more
|
||
> scalable, because the implementation you have looks like it would have
|
||
> some contention for the shared GID hashtable.
|
||
|
||
I guess the performance would depend a lot on how good/bad the filesystem
|
||
is at creating and deleting a lot of small files.
|
||
|
||
> I would be inclined to require GIDs to be numbers (probably int8's)
|
||
> instead of strings, so that we don't have any problems with funny
|
||
> characters in the file names. That's negotiable though, as we could
|
||
> certainly uuencode the strings or something to avoid that trap.
|
||
|
||
I'm afraid we have to support arbitrary strings. I think at least the Java
|
||
Transaction API requires that, I'm not sure though if that could be
|
||
worked around in the JDBC driver.
|
||
|
||
> You were concerned about how to mark prepared transactions in pg_clog,
|
||
> given that Alvaro had already commandeered state '11' for
|
||
> subtransactions. Since only a toplevel transaction can be prepared,
|
||
> it might work to allow state '11' with a zero pg_subtrans parent link
|
||
> to mean a prepared transaction. This would imply factoring prepared
|
||
> XIDs into GlobalXmin (so that pg_subtrans entries don't get recycled
|
||
> too soon) but we probably have to do that anyway. AFAICS, prepared
|
||
> but uncommitted XIDs have to be considered still InProgress, so if
|
||
> they are less than GlobalXmin we'd lose.
|
||
|
||
Yes, they must be considered InProgress. The snapshot code needs to be
|
||
modified to handle an arbitrary number of in progress transactions.
|
||
|
||
|
||
I've been thinking if it would be useful to have the COMMIT
|
||
PREPARED/ROLLBACK PREPARED commands under transaction control themselves.
|
||
You could for example do "BEGIN; COMMIT PREPARED mygid; COMMIT PREPARED
|
||
mygid2; COMMIT;" to atomically commit two already-prepared transactions,
|
||
and even chain the 2PC transactions like "BEGIN; COMMIT PREPARED mygid;
|
||
PREPARE TRANSACTION mygid2". It seems feasible to implement, just postpone
|
||
the actual 2nd phase commit to the end of the commit of the enclosing
|
||
transaction.
|
||
|
||
- Heikki
|
||
|
||
---------------------------(end of broadcast)---------------------------
|
||
TIP 7: don't forget to increase your free space map settings
|
||
|
||
From pgsql-hackers-owner+M59924=pgman=candle.pha.pa.us@postgresql.org Tue Oct 12 15:25:43 2004
|
||
Return-path: <pgsql-hackers-owner+M59924=pgman=candle.pha.pa.us@postgresql.org>
|
||
Received: from svr1.postgresql.org (svr1.postgresql.org [200.46.204.71])
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|
||
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||
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Date: Sat, 9 Oct 2004 14:48:09 +0300 (EEST)
|
||
From: Heikki Linnakangas <hlinnaka@iki.fi>
|
||
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||
To: pgsql-hackers@postgresql.org
|
||
Subject: [HACKERS] Two-phase commit patch updated
|
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In-Reply-To: <354.1097099170@sss.pgh.pa.us>
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|
||
<200402080138.i181cPl15259@candle.pha.pa.us> <Pine.OSF.4.58.0402220324250.126984@kosh.hut.fi>
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||
<Pine.OSF.4.58.0403231758350.513267@kosh.hut.fi> <354.1097099170@sss.pgh.pa.us>
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Status: OR
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||
|
||
I brought the 2PC patch up to date:
|
||
|
||
http://www.hut.fi/~hlinnaka/pgsql/
|
||
|
||
There's no new functionality, I just fixed all the bit rot so that it
|
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applies to the current CVS tip.
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- Heikki
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Subject: [HACKERS] 2PC support
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From: Michael.Giroux@objectweb.org
|
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Date: Wed, 20 Oct 2004 08:40:53 -0700
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X-MIMETrack: Serialize by Router on US-PHX1/US/BULL(Release 6.5.1|January 21, 2004) at
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Status: OR
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|
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Hi,
|
||
I've read a few of the recent posts about 2-phase-commit support. I
|
||
noticed some discussion related to persisting the state of in-doubt
|
||
transactions, and thought you might be able to take advantage of work that
|
||
has been going on in the area of transaction logs.
|
||
|
||
I'm working on a project (howl.objectweb.org) to implement a journal
|
||
designed specifically to support transaction managers 2PC protocol. The
|
||
project was concieved during a meeting between ObjectWeb and Apache
|
||
Geronimo developers last year at ApacheCon 2003. The journal is currently
|
||
used by the Apache Geronimo TM, Codehaus ActiveMQ, and ObjectWeb JOTM
|
||
projects.
|
||
|
||
Although the main objective is to support TM 2PC protocol, it could be
|
||
used as a database before-image journal as well. The code is BSD
|
||
licensed. More at http://howl.objectweb.org.
|
||
|
||
Also, with respect to the requirements for the 2PC protocol, there is an
|
||
excellent discussion by Mike Spille. Mike wrote a series of articles
|
||
titled "XA Exposed". You can review the articles at
|
||
http://www.theserverside.com. Search for "xa exposed".
|
||
|
||
If any of you will be at ApacheCon 2004 next month, I'm giving a paper on
|
||
the HOWL journal. I'll be happy to talk with you there.
|
||
|
||
Michael Giroux, objectweb.org
|
||
|
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From pgsql-hackers-owner+M63326=pgman=candle.pha.pa.us@postgresql.org Wed Jan 19 13:02:04 2005
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Date: Wed, 19 Jan 2005 20:55:57 +0200 (EET)
|
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From: Heikki Linnakangas <hlinnaka@iki.fi>
|
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To: pgsql-hackers@postgresql.org
|
||
Subject: [HACKERS] Two-phase commit for 8.1
|
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Message-ID: <Pine.OSF.4.61.0501192055310.62540@kosh.hut.fi>
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version=2.61
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Status: OR
|
||
|
||
Hi,
|
||
|
||
Now that we got 8.0 out of the door, I'm submitting my two-phase commit patch
|
||
again for discussion.
|
||
|
||
http://www.hut.fi/~hlinnaka/pgsql/
|
||
|
||
Do we want it in 8.1, if we want a short development cycle? It needs a new
|
||
pg_twophase subdirectory, and it introduces a new system view, so I guess it
|
||
requires an initdb (or pg_upgrade).
|
||
|
||
Any comments on the implementation or the new commands?
|
||
|
||
I would appreciate help testing the JDBC driver with an application server that
|
||
does XA recovery properly.
|
||
|
||
- Heikki
|
||
|
||
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From pgsql-hackers-owner+M63328=pgman=candle.pha.pa.us@postgresql.org Wed Jan 19 15:00:49 2005
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Date: Wed, 19 Jan 2005 16:58:55 -0400 (AST)
|
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From: "Marc G. Fournier" <scrappy@postgresql.org>
|
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To: Heikki Linnakangas <hlinnaka@iki.fi>
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cc: pgsql-hackers@postgresql.org
|
||
Subject: Re: [HACKERS] Two-phase commit for 8.1
|
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In-Reply-To: <Pine.OSF.4.61.0501192055310.62540@kosh.hut.fi>
|
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Message-ID: <20050119165747.U47533@ganymede.hub.org>
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version=2.61
|
||
Status: OR
|
||
|
||
|
||
If the patch is ready to be committed early in the cycle, I'd say most
|
||
definitely ... just depends on how late in the cycle its ready ...
|
||
|
||
I *believe* that 8.1, we're looking at a 2mo cycle before beta, so figure
|
||
beta for ~April 1st (no april fools jokes, eh?) ...
|
||
|
||
On Wed, 19 Jan 2005, Heikki Linnakangas wrote:
|
||
|
||
> Hi,
|
||
>
|
||
> Now that we got 8.0 out of the door, I'm submitting my two-phase commit patch
|
||
> again for discussion.
|
||
>
|
||
> http://www.hut.fi/~hlinnaka/pgsql/
|
||
>
|
||
> Do we want it in 8.1, if we want a short development cycle? It needs a new
|
||
> pg_twophase subdirectory, and it introduces a new system view, so I guess it
|
||
> requires an initdb (or pg_upgrade).
|
||
>
|
||
> Any comments on the implementation or the new commands?
|
||
>
|
||
> I would appreciate help testing the JDBC driver with an application server
|
||
> that does XA recovery properly.
|
||
>
|
||
> - Heikki
|
||
>
|
||
> ---------------------------(end of broadcast)---------------------------
|
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> TIP 2: you can get off all lists at once with the unregister command
|
||
> (send "unregister YourEmailAddressHere" to majordomo@postgresql.org)
|
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>
|
||
|
||
----
|
||
Marc G. Fournier Hub.Org Networking Services (http://www.hub.org)
|
||
Email: scrappy@hub.org Yahoo!: yscrappy ICQ: 7615664
|
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|
||
---------------------------(end of broadcast)---------------------------
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From pgsql-hackers-owner+M63331=pgman=candle.pha.pa.us@postgresql.org Wed Jan 19 18:45:25 2005
|
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Wed, 19 Jan 2005 19:42:04 -0500 (EST)
|
||
To: "Marc G. Fournier" <scrappy@postgresql.org>
|
||
cc: Heikki Linnakangas <hlinnaka@iki.fi>, pgsql-hackers@postgresql.org
|
||
Subject: Re: [HACKERS] Two-phase commit for 8.1
|
||
In-Reply-To: <20050119165747.U47533@ganymede.hub.org>
|
||
References: <Pine.OSF.4.61.0501192055310.62540@kosh.hut.fi> <20050119165747.U47533@ganymede.hub.org>
|
||
Comments: In-reply-to "Marc G. Fournier" <scrappy@postgresql.org>
|
||
message dated "Wed, 19 Jan 2005 16:58:55 -0400"
|
||
Date: Wed, 19 Jan 2005 19:42:03 -0500
|
||
Message-ID: <1115.1106181723@sss.pgh.pa.us>
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From: Tom Lane <tgl@sss.pgh.pa.us>
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|
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"Marc G. Fournier" <scrappy@postgresql.org> writes:
|
||
> If the patch is ready to be committed early in the cycle, I'd say most
|
||
> definitely ... just depends on how late in the cycle its ready ...
|
||
|
||
My recollection is that it's quite far from being complete. I had hoped
|
||
to spend some time during the 8.1 cycle helping Heikki finish it up,
|
||
but if we stick to the 2-month-dev-cycle idea I'm afraid there's no way
|
||
it'll be done in time. I thought that "some time" would probably amount
|
||
to a solid man-month or so, and there's no way I can spend half my time
|
||
on just one feature for this cycle.
|
||
|
||
If Heikki wants this in for 8.1, the right thing to do is vote against
|
||
the short-dev-cycle idea. But we need a plausible answer about what to
|
||
do about ARC to make that credible...
|
||
|
||
regards, tom lane
|
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From pgsql-hackers-owner+M63432=pgman=candle.pha.pa.us@postgresql.org Sun Jan 23 05:41:58 2005
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Date: Sun, 23 Jan 2005 13:37:30 +0200 (EET)
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cc: pgsql-hackers@postgresql.org
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Subject: Re: [HACKERS] Two-phase commit for 8.1
|
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Message-ID: <Pine.OSF.4.61.0501231147320.64318@kosh.hut.fi>
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<20050119165747.U47533@ganymede.hub.org> <1115.1106181723@sss.pgh.pa.us>
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On Sun, 23 Jan 2005, Hans-J<>rgen Sch<63>nig wrote:
|
||
|
||
> Heikki,
|
||
>
|
||
> What is still missing to complete the 2PC patch?.
|
||
|
||
Here's my TODO on things that need to be done:
|
||
|
||
* large objects
|
||
* guc variables
|
||
* notify/listen
|
||
|
||
Large objects and notify/listen should be quite straightforward. GUC
|
||
variables need some thinking, but shouldn't be much work.
|
||
|
||
As the patch gets more attention, I'm sure more issues will come up.
|
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|
||
- Heikki
|
||
|
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---------------------------(end of broadcast)---------------------------
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TIP 9: the planner will ignore your desire to choose an index scan if your
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joining column's datatypes do not match
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From pgsql-hackers-owner+M63434=pgman=candle.pha.pa.us@postgresql.org Sun Jan 23 09:15:24 2005
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Return-path: <pgsql-hackers-owner+M63434=pgman=candle.pha.pa.us@postgresql.org>
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id 666A5527DA; Sun, 23 Jan 2005 12:13:37 -0300 (CLST)
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Date: Sun, 23 Jan 2005 12:13:37 -0300
|
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From: Alvaro Herrera <alvherre@dcc.uchile.cl>
|
||
To: Heikki Linnakangas <hlinnaka@iki.fi>
|
||
cc: =?iso-8859-1?Q?Hans-J=FCrgen_Sch=F6nig?= <postgres@cybertec.at>,
|
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pgsql-hackers@postgresql.org
|
||
Subject: Re: [HACKERS] Two-phase commit for 8.1
|
||
Message-ID: <20050123151337.GD4406@dcc.uchile.cl>
|
||
References: <Pine.OSF.4.61.0501192055310.62540@kosh.hut.fi> <20050119165747.U47533@ganymede.hub.org> <1115.1106181723@sss.pgh.pa.us> <Pine.OSF.4.61.0501212033520.352045@kosh.hut.fi> <41F3699B.2060608@cybertec.at> <Pine.OSF.4.61.0501231147320.64318@kosh.hut.fi>
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Status: OR
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On Sun, Jan 23, 2005 at 01:37:30PM +0200, Heikki Linnakangas wrote:
|
||
|
||
> As the patch gets more attention, I'm sure more issues will come up.
|
||
|
||
I see the changes to the lock manager are huge. Can you explain what's
|
||
the idea behind those? Do you release the locks and then reacquire
|
||
them, or do you reassign them to a pseudo process? Are there
|
||
possibilities of deadlock somewhere?
|
||
|
||
--
|
||
Alvaro Herrera (<alvherre[@]dcc.uchile.cl>)
|
||
Thou shalt study thy libraries and strive not to reinvent them without
|
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cause, that thy code may be short and readable and thy days pleasant
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and productive. (7th Commandment for C Programmers)
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From pgsql-hackers-owner+M63438=pgman=candle.pha.pa.us@postgresql.org Sun Jan 23 11:36:40 2005
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Return-path: <pgsql-hackers-owner+M63438=pgman=candle.pha.pa.us@postgresql.org>
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Sun, 23 Jan 2005 19:32:55 +0200
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Date: Sun, 23 Jan 2005 19:32:55 +0200 (EET)
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From: Heikki Linnakangas <hlinnaka@iki.fi>
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|
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pgsql-hackers@postgresql.org
|
||
Subject: Re: [HACKERS] Two-phase commit for 8.1
|
||
In-Reply-To: <20050123151337.GD4406@dcc.uchile.cl>
|
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Message-ID: <Pine.OSF.4.61.0501231916520.414393@kosh.hut.fi>
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|
||
<20050119165747.U47533@ganymede.hub.org> <1115.1106181723@sss.pgh.pa.us>
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<Pine.OSF.4.61.0501212033520.352045@kosh.hut.fi> <41F3699B.2060608@cybertec.at>
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<Pine.OSF.4.61.0501231147320.64318@kosh.hut.fi> <20050123151337.GD4406@dcc.uchile.cl>
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Status: OR
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On Sun, 23 Jan 2005, Alvaro Herrera wrote:
|
||
|
||
> On Sun, Jan 23, 2005 at 01:37:30PM +0200, Heikki Linnakangas wrote:
|
||
>
|
||
>> As the patch gets more attention, I'm sure more issues will come up.
|
||
|
||
> I see the changes to the lock manager are huge. Can you explain what's
|
||
> the idea behind those? Do you release the locks and then reacquire
|
||
> them, or do you reassign them to a pseudo process?
|
||
|
||
I reassign them to a pseudo process (persistedLocksProc).
|
||
|
||
Much of the changes in lock.c are just about moving code around.
|
||
Some copy-paste code has been put in functions. LockAcquire has been
|
||
changed to take PGPROC as an argument, so that locks can be acquired on
|
||
behalf of the pseudo process.
|
||
|
||
Then there's completely new code for persisting locks on PREPARE
|
||
TRANSACTION and reacquiring them on recovery.
|
||
|
||
If it helps, I could try to split it into two patches, one with code
|
||
rearrangements that don't change current behaviour, and then the actual
|
||
2PC stuff on top of that.
|
||
|
||
> Are there possibilities of deadlock somewhere?
|
||
|
||
Not that I know of.
|
||
|
||
- Heikki
|
||
|
||
---------------------------(end of broadcast)---------------------------
|
||
TIP 5: Have you checked our extensive FAQ?
|
||
|
||
http://www.postgresql.org/docs/faq
|
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|
||
From pgsql-hackers-owner+M63788=pgman=candle.pha.pa.us@postgresql.org Mon Jan 31 09:35:11 2005
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id F287A52515; Mon, 31 Jan 2005 12:01:19 -0300 (CLST)
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Date: Mon, 31 Jan 2005 12:01:19 -0300
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From: Alvaro Herrera <alvherre@dcc.uchile.cl>
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To: Heikki Linnakangas <hlinnaka@iki.fi>
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cc: =?iso-8859-1?Q?Hans-J=FCrgen_Sch=F6nig?= <postgres@cybertec.at>,
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pgsql-hackers@postgresql.org
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Subject: Re: [HACKERS] Two-phase commit for 8.1
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Message-ID: <20050131150119.GI22141@dcc.uchile.cl>
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References: <Pine.OSF.4.61.0501192055310.62540@kosh.hut.fi> <20050119165747.U47533@ganymede.hub.org> <1115.1106181723@sss.pgh.pa.us> <Pine.OSF.4.61.0501212033520.352045@kosh.hut.fi> <41F3699B.2060608@cybertec.at> <Pine.OSF.4.61.0501231147320.64318@kosh.hut.fi> <20050123151337.GD4406@dcc.uchile.cl> <Pine.OSF.4.61.0501231916520.414393@kosh.hut.fi>
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Status: OR
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On Sun, Jan 23, 2005 at 07:32:55PM +0200, Heikki Linnakangas wrote:
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||
> If it helps, I could try to split it into two patches, one with code
|
||
> rearrangements that don't change current behaviour, and then the actual
|
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> 2PC stuff on top of that.
|
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I think that'd be a good idea, because such a patch could be merged
|
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right now, and the actual 2PC stuff would be smaller and easier to
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review.
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You'd only need a committer to actually commit the initial patch ...
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--
|
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Alvaro Herrera (<alvherre[@]dcc.uchile.cl>)
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"No hay cielo posible sin hundir nuestras ra<72>ces
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en la profundidad de la tierra" (Malucha Pinto)
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TIP 9: the planner will ignore your desire to choose an index scan if your
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joining column's datatypes do not match
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From pgsql-hackers-owner+M66050@postgresql.org Wed Apr 6 10:04:39 2005
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Return-path: <pgsql-hackers-owner+M66050@postgresql.org>
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Wed, 6 Apr 2005 16:59:48 +0300
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Date: Wed, 6 Apr 2005 16:59:47 +0300 (EEST)
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From: Heikki Linnakangas <hlinnaka@iki.fi>
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To: Alvaro Herrera <alvherre@dcc.uchile.cl>
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cc: pgsql-hackers@postgresql.org
|
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Subject: Re: [HACKERS] Two phase commit
|
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In-Reply-To: <20050405230731.GA26960@surnet.cl>
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Status: OR
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On Tue, 5 Apr 2005, Alvaro Herrera wrote:
|
||
|
||
> What happenned to your two phase commit patch? Are you still working on
|
||
> it? Have you got something done from the last time we heard from you?
|
||
|
||
I've kept it up-to-date by doing "cvs update" every now and then and
|
||
fixing possible conflicts.
|
||
|
||
It would be nice if you hackers could take a serious look at it and tell
|
||
what needs to be done to get it finally committed.
|
||
|
||
I've been busy with other things and haven't had the time to push it.
|
||
|
||
I try to update my "project page" every time I update the patch:
|
||
|
||
http://www.hut.fi/~hlinnaka/pgsql/
|
||
|
||
There isn't any big issues left as far as I know.
|
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- Heikki
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