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From: Laurenz Albe <[email protected]>
To: Sbob <[email protected]>
To: [email protected]
Subject: Re: logical replication, with a replication slot but still getting "requested WAL segment has already been removed"
Date: Tue, 23 Dec 2025 11:17:15 +0100
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>

On Mon, 2025-12-22 at 14:14 -0700, Sbob wrote:
> We have setup logical replication for some very large tables, both publisher and subscriber
> are running postgresql v14, however even though the locical replication is using a replication
> slot we keep getting this error:
> 
>  2025-12-21 23:25:50.452 UTC [2131314] LOG:  logical replication apply worker for subscription "bigtables_sub" has started
>  2025-12-21 23:25:50.987 UTC [2131314] ERROR:  could not receive data from WAL stream: ERROR:  requested WAL segment 000000020000089F00000098 has already been removed

Look into "pg_replication_slots" on the publisher, perhaps the "wal_status" has changed
to "unreserved" or "lost".  One possible cause for that could be the setting of
"max_slot_wal_keep_size" on the publisher.

Yours,
Laurenz Albe

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