Horton

Re: Add 64-bit XIDs into PostgreSQL 15

Zhang Mingli <zmlpostgres@gmail.com>

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From: Zhang Mingli <zmlpostgres@gmail.com>
To: Dilip Kumar <dilipbalaut@gmail.com>, Maxim Orlov <orlovmg@gmail.com>
Cc: Pavel Borisov <pashkin.elfe@gmail.com>, Aleksander Alekseev <aleksander@timescale.com>, Postgres hackers <pgsql-hackers@lists.postgresql.org>, Justin Pryzby <pryzby@telsasoft.com>, Stephen Frost <sfrost@snowman.net>, Alexander Korotkov <aekorotkov@gmail.com>, Andres Freund <andres@anarazel.de>, Ilya Anfimov <ilan@tzirechnoy.com>
Date: 2022-09-20T08:15:40Z
Lists: pgsql-hackers

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

  1. Add SLRU tests for 64-bit page case

  2. Make use FullTransactionId in 2PC filenames

  3. Use larger segment file names for pg_notify

  4. Index SLRUs by 64-bit integers rather than by 32-bit integers

Hi,

With these patches, it seems that we don’t need to handle wraparound in
GetNextLocalTransactionId() too, as LocalTransactionId is unit64 now.

```
LocalTransactionId
GetNextLocalTransactionId(void)
{
    LocalTransactionId result;

    /* loop to avoid returning InvalidLocalTransactionId at wraparound */
    do
    {
        result = nextLocalTransactionId++;
    } while (!LocalTransactionIdIsValid(result));

    return result;
}
```

Regards,
Zhang Mingli