Re: [External] Slot issues

from your master, can you give us the output of

select * from pg_replication_slots;

maybe some stray slot exists that you may not be aware of ?

Regards,
Vijay

On Mon, Oct 15, 2018 at 1:08 AM Vijaykumar Jain <vjain(at)opentable(dot)com> wrote:

> ok my bad.
>
> i just set one of the 9.6.9 versions to have max_replication_slots =2 and
> still i had to slots active.
>
> ostgres=# table pg_replication_slots;
> slot_name | plugin | slot_type | datoid | database | active
> | active_pid | xmin | catalog_xmin | restart_lsn | confirmed_flush_lsn
>
> -------------------------+--------+-----------+--------+----------+--------+------------+------+--------------+-------------+---------------------
> a02 | | physical | | | t | 13719 |
> | | 2/D30000D0 |
> a03 | | physical | | | t | 13720 |
> | | 2/D30000D0 |
> (2 rows)
>
> postgres=# show max_replication_slots;
> max_replication_slots
> -----------------------
> 2
> (1 row)
>
>
> yep it should work with 2.
> Regards,
> Vijay
>
>
> On Mon, Oct 15, 2018 at 1:02 AM Vijaykumar Jain <vjain(at)opentable(dot)com>
> wrote:
>
>> I guess max_replication_slots has to be greater than active replication
>> slots.
>> maybe you need to increase max_replication_slots to 3 to have 2 active
>> slots.
>>
>> Regards,
>> Vijay
>>
>>
>> On Mon, Oct 15, 2018 at 12:54 AM bhargav kamineni <
>> bhargavpostgres(at)gmail(dot)com> wrote:
>>
>>> for 9.x. Default was 0. we have set max_replication_slot =2 , one is
>>> already being used , postgres should use second slot for another server
>>> but dono why its throwing error
>>>
>>> On Mon, 15 Oct 2018 at 00:32, Vijaykumar Jain <vjain(at)opentable(dot)com>
>>> wrote:
>>>
>>>> I guess max_replication_slots has to > current total slots in use.
>>>> (and not >= )
>>>>
>>>>
>>>> https://www.postgresql.org/docs/10/static/runtime-config-replication.html
>>>>
>>>> https://github.com/postgres/postgres/blob/d6e98ebe375e115c29028f9bd090f0f7e07e2527/src/backend/replication/slot.c#L1506
>>>>
>>>> from the doc, it says defaults are 10, any reason why you have set it
>>>> to 2. You need to set it at a value higher than number of slots active.
>>>> also, i guess changing this parameter would require a server restart.
>>>>
>>>>
>>>>
>>>>
>>>> Regards,
>>>> Vijay
>>>>
>>>>
>>>> On Mon, Oct 15, 2018 at 12:16 AM bhargav kamineni <
>>>> bhargavpostgres(at)gmail(dot)com> wrote:
>>>>
>>>>> Hi Team,
>>>>>
>>>>> I am getting this ERROR while starting my second slave server
>>>>>
>>>>> PANIC: too many replication slots active before shutdown
>>>>> HINT: Increase max_replication_slots and try again.
>>>>>
>>>>> max_replication_slots on my master is 2 and one of them is already
>>>>> active for another slave,
>>>>> do i need to increase this parameter for the need of working of
>>>>> another slave ? if so whats the reason ?
>>>>>
>>>>>
>>>>>
>>>>> Thanks
>>>>> Bhargav K
>>>>>
>>>>