Re: [HACKERS] Restricting maximum keep segments by repslots

At Wed, 08 Apr 2020 14:19:56 +0900 (JST), Kyotaro Horiguchi <horikyota.ntt@gmail.com> wrote in 
me> Just avoiding starting replication when restart_lsn is invalid is
me> sufficient (the attached, which is equivalent to a part of what the
me> invalidated flag did). I thing that the error message needs a Hint but
me> it looks on the subscriber side as:

At Wed, 08 Apr 2020 17:02:22 +0900 (JST), Kyotaro Horiguchi <horikyota.ntt@gmail.com> wrote in 
me> > At Wed, 08 Apr 2020 14:19:56 +0900 (JST), Kyotaro Horiguchi <horikyota.ntt@gmail.com> wrote in 
me> > The latch triggered by checkpoint request by CHECKPOINT command has
me> > been absorbed by ConditionVariableSleep() in
me> > InvalidateObsoleteReplicationSlots.  The attached allows checkpointer
me> > use MyLatch for other than checkpoint request while a checkpoint is
me> > running.
me> 
me> Checkpoint requests happens during waiting for the CV causes spurious
me> wake up but that doesn't harm.

I added the two above to open items[1] so as not to be forgotten.

[1] https://wiki.postgresql.org/wiki/PostgreSQL_13_Open_Items#Open_Issues

regards.

-- 
Kyotaro Horiguchi
NTT Open Source Software Center