Re: BDR, wal segment has been removed, is it possible move forward?

On 7 September 2017 at 21:16, milist ujang <ujang(dot)milist(at)gmail(dot)com> wrote:

> Hi Craig,
>
> On Wed, Sep 6, 2017 at 4:07 PM, Craig Ringer <craig(at)2ndquadrant(dot)com>
> wrote:
>
>>
>> You could drop and re-create the replication slot, I guess. But your
>> nodes would be hopelessly out of sync and need manual resync (with data
>> replication disabled) of one node vs another.
>>
>
> Thanks for pointing to replication slot.
> I Simulate the similar situation in dev env by remove the wal segment on
> node1, when node2 keep inserting into a table, now it perfectly can move
> forward to latest wal segment, but the difference situation is at
> node_status.
>
> In production node_status is i in node1
>

there's a known bug in bdr1 where sometimes the node status doesn't update
from 'i' after joining.

> can I safely update the node_status directy on bdr.bdr_nodes?
>

Usually not. In this one specific case where a node is known to be fully
joined and online, but its status is stuck at 'i', yes.

--
Craig Ringer http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services