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From: Christoph Moench-Tegeder <[email protected]>
To: Fabrice Chapuis <[email protected]>
Cc: PostgreSQL Hackers <[email protected]>
Subject: Re: wal recycling problem
Date: Mon, 2 Oct 2023 12:06:37 +0200
Message-ID: <[email protected]> (raw)
In-Reply-To: <CAA5-nLB5axGwwj6ft6G5tHxKqEC932M5k-4Ytb2W1iQziqmuLQ@mail.gmail.com>
References: <CAA5-nLCrbc90DHbX_9Yav72hEXUetkZ9iO8zmKvCvYNZkDHx9g@mail.gmail.com>
	<[email protected]>
	<CAA5-nLB5axGwwj6ft6G5tHxKqEC932M5k-4Ytb2W1iQziqmuLQ@mail.gmail.com>

Hi,

## Fabrice Chapuis ([email protected]):

> on the other hand there are 2 slots for logical replication which display
> status extended. I don't understand why given that the confirmed_flush_lsn
> field that is up to date. The restart_lsn remains frozen, for what reason?

There you have it - "extended" means "holding wal". And as long as the
restart_lsn does not advance, checkpointer cannot free any wal beyond
that lsn. My first idea would be some long-running (or huge) transaction
which is in process (active or still being streamed). I'd recommend
looking into what the clients on these slots are doing.

Regards,
Christoph

-- 
Spare Space

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