From: | Fujii Masao <masao(dot)fujii(at)oss(dot)nttdata(dot)com> |
---|---|
To: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
Cc: | pgsql-docs(at)lists(dot)postgresql(dot)org |
Subject: | Re: The description for pg_replication_slots.restart_lsn |
Date: | 2020-06-25 05:48:18 |
Message-ID: | 0414a23a-974c-04d5-ccb0-70ebcc76fcb7@oss.nttdata.com |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-docs |
On 2020/06/25 10:00, Alvaro Herrera wrote:
> On 2020-Jun-17, Fujii Masao wrote:
>
>> The document explains that restart_lsn column in pg_replication_slots view is:
>>
>> The address (LSN) of oldest WAL which still might be required by
>> the consumer of this slot and thus won't be automatically removed
>> during checkpoints.
>>
>> But the latter part is not true in v13 thanks to max_slot_wal_keep_size.
>> I think that we need to update it as follows. Thought?
>>
>> The address (LSN) of oldest WAL which still might be required by
>> the consumer of this slot and thus won't be automatically removed
>> during checkpoints unless this LSN gets behind more than
>> max_slot_wal_keep_size from the current LSN.
>
> We just added the invalidated_at LSN to replication slots; while working
> on the tests for that today, I was thinking that it might be useful to
> display that LSN in pg_replication_slots. What do you think of the idea
> of publishing the invalidated_at LSN in pg_replication_slot.restart_lsn
> when the slot is invalid?
I like having separate column for invalidated_at because (at least for me)
it's a bit confusing to report the different meaning values in the same column
depending on the state.
Regards,
--
Fujii Masao
Advanced Computing Technology Center
Research and Development Headquarters
NTT DATA CORPORATION
From | Date | Subject | |
---|---|---|---|
Next Message | Daniel Gustafsson | 2020-06-25 07:18:37 | Re: wrong output column title in example |
Previous Message | Alvaro Herrera | 2020-06-25 01:00:16 | Re: The description for pg_replication_slots.restart_lsn |