On 2020/11/26 3:45, Alvaro Herrera wrote:
On 2020-Nov-25, Fujii Masao wrote:
But whether MyWalSnd->write is InvalidRecPtr or not, if it's behind sentPtr,
walsender should keep waiting for the ack to all the sent message to be
replied, i.e., isn't this expected behavior of normal shutdown? That is,
if we want to shutdown walsender even when the client side doesn't
reply message, immediate shutdown should be used or the client side
should be terminated, instead?
I don't think "waiting forever" can be considered the expected behavior;
this has caused what are nominally production outages several times
already, since we sent a shutdown signal to the server and it never
completed shutting down.
On the second thought, walsender doesn't wait forever unless
wal_sender_timeout is disabled, even in the case in discussion?
Or if there is the case where wal_sender_timeout doesn't work expectedly,
we might need to fix that at first.
Regards,
--
Fujii Masao
Advanced Computing Technology Center
Research and Development Headquarters
NTT DATA CORPORATION
