Re: [DBmirror Issue] recordchange() dies in packageData unless

From: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
To: Steven Singer <ssinger(at)navtechinc(dot)com>
Cc: "Rajesh Kumar Mallah(dot)" <mallah(at)trade-india(dot)com>, pgsql-admin(at)postgresql(dot)org, pgsql-replication(at)postgresql(dot)org
Subject: Re: [DBmirror Issue] recordchange() dies in packageData unless
Date: 2002-09-29 03:24:05
Message-ID: 200209290324.g8T3O5K16601@candle.pha.pa.us
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Your patch has been added to the PostgreSQL unapplied patches list at:

http://candle.pha.pa.us/cgi-bin/pgpatches

I will try to apply it within the next 48 hours.

---------------------------------------------------------------------------

Steven Singer wrote:
> On Mon, 23 Sep 2002, Rajesh Kumar Mallah. wrote:
>
> > Hi
> >
> > Is anyone using dbmirror in production?
>
> We've been using it in production for sometime now and haven't been having
> any problems with it.
>
> >
> > I Intend to replicate a set of tables between local and remote servers.
> > and plan to use dbmirror.
> >
>
> The speed of replicating edits over a WAN isn't that great.
> If you perform a lot of edits in a short period of time there could be a
> backlog.
>
> > I observe that unless a table has a primary key the trigger recordchange()
> > which is supposed to be attached to a replicated table does not works properly
> > and causes postmaster to crash.
> >
>
> dbmirror requires that all tables that you replicate have primary
> keys(This should be said more explictly in the README)
>
> However it still should not crash(In defence it will only crash the
> postmaster when you compile dbmirror in debug mode).
>
> The attatched patch to pending.c should prevent it from crashing the
> postmaster. Let me know if it fixes the problem and I'll submit it to
> pgpatches.
>
>
> *** pending.c Mon Sep 23 20:24:04 2002
> --- /tmp/pending.c Mon Sep 23 20:23:43 2002
> ***************
> *** 226,232 ****
> /* pplan = SPI_saveplan(pplan); */
> cpKeyData = packageData(tTupleData, tTupleDesc, tpTrigData,
> PRIMARY);
> #if defined DEBUG_OUTPUT
> ! elog(NOTICE, cpKeyData);
> #endif
> saPlanData[0] = PointerGetDatum(cpKeyData);
>
> --- 226,235 ----
> /* pplan = SPI_saveplan(pplan); */
> cpKeyData = packageData(tTupleData, tTupleDesc, tpTrigData,
> PRIMARY);
> #if defined DEBUG_OUTPUT
> ! if(cpKeyData != NULL )
> ! {
> ! elog(NOTICE, cpKeyData);
> ! }
> #endif
> saPlanData[0] = PointerGetDatum(cpKeyData);
>
>
>
>
>
> --
> Steven Singer ssinger(at)navtechinc(dot)com
> Aircraft Performance Systems Phone: 519-747-1170 ext 282
> Navtech Systems Support Inc. AFTN: CYYZXNSX SITA: YYZNSCR
> Waterloo, Ontario ARINC: YKFNSCR
>
>
> ---------------------------(end of broadcast)---------------------------
> TIP 4: Don't 'kill -9' the postmaster
>

--
Bruce Momjian | http://candle.pha.pa.us
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 359-1001
+ If your life is a hard drive, | 13 Roberts Road
+ Christ can be your backup. | Newtown Square, Pennsylvania 19073

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