From: | Dilip Kumar <dilipbalaut(at)gmail(dot)com> |
---|---|
To: | Tomas Vondra <tomas(dot)vondra(at)enterprisedb(dot)com> |
Cc: | Ashutosh Bapat <ashutosh(dot)bapat(dot)oss(at)gmail(dot)com>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>, Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>, Peter Eisentraut <peter(dot)eisentraut(at)enterprisedb(dot)com> |
Subject: | Re: logical decoding and replication of sequences, take 2 |
Date: | 2023-09-20 09:53:43 |
Message-ID: | CAFiTN-sA0fs6xAsqDGOO7i5avz-jQ-i9-xZR4Wk7J9C=4n0BQg@mail.gmail.com |
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On Wed, Aug 16, 2023 at 7:57 PM Tomas Vondra
<tomas(dot)vondra(at)enterprisedb(dot)com> wrote:
>
I was reading through 0001, I noticed this comment in
ReorderBufferSequenceIsTransactional() function
+ * To decide if a sequence change should be handled as transactional or applied
+ * immediately, we track (sequence) relfilenodes created by each transaction.
+ * We don't know if the current sub-transaction was already assigned to the
+ * top-level transaction, so we need to check all transactions.
It says "We don't know if the current sub-transaction was already
assigned to the top-level transaction, so we need to check all
transactions". But IIRC as part of the steaming of in-progress
transactions we have ensured that whenever we are logging the first
change by any subtransaction we include the top transaction ID in it.
Refer this code
LogicalDecodingProcessRecord(LogicalDecodingContext *ctx,
XLogReaderState *record)
{
...
/*
* If the top-level xid is valid, we need to assign the subxact to the
* top-level xact. We need to do this for all records, hence we do it
* before the switch.
*/
if (TransactionIdIsValid(txid))
{
ReorderBufferAssignChild(ctx->reorder,
txid,
XLogRecGetXid(record),
buf.origptr);
}
}
--
Regards,
Dilip Kumar
EnterpriseDB: http://www.enterprisedb.com
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