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From: Koen De Groote <[email protected]>
To: PostgreSQL General <[email protected]>
Subject: On a subscriber, why is last_msg_send_time in pg_stat_subscription sometimes null?
Date: Fri, 23 Aug 2024 16:33:08 +0200
Message-ID: <CAGbX52H8dDW8nVC8Zxg0-HFY58fAXd93XuxC83_DPHARZkpepw@mail.gmail.com> (raw)

I'm running this query:

SELECT subname, received_lsn, latest_end_lsn,
last_msg_send_time, last_msg_receipt_time
FROM pg_catalog.pg_stat_subscription;

And "last_msg_send_time" will sometimes be null. All I can find in the
documentation is that this value represents: "Send time of last message
received from origin WAL sender; NULL for parallel apply workers"

But I have no context for what parallel apply workers are or why they are
NULL sometimes and other times not.

Can anyone explain?

Regards,
Koen De Groote

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