From: | Kyotaro Horiguchi <horikyota(dot)ntt(at)gmail(dot)com> |
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To: | alvherre(at)2ndquadrant(dot)com |
Cc: | jgdr(at)dalibo(dot)com, andres(at)anarazel(dot)de, michael(at)paquier(dot)xyz, sawada(dot)mshk(at)gmail(dot)com, peter(dot)eisentraut(at)2ndquadrant(dot)com, pgsql-hackers(at)lists(dot)postgresql(dot)org, thomas(dot)munro(at)enterprisedb(dot)com, sk(at)zsrv(dot)org, michael(dot)paquier(at)gmail(dot)com |
Subject: | Re: [HACKERS] Restricting maximum keep segments by repslots |
Date: | 2020-04-10 02:59:20 |
Message-ID: | 20200410.115920.1130303270055020682.horikyota.ntt@gmail.com |
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Lists: | pgsql-hackers |
At Wed, 08 Apr 2020 14:19:56 +0900 (JST), Kyotaro Horiguchi <horikyota(dot)ntt(at)gmail(dot)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(dot)ntt(at)gmail(dot)com> wrote in
me> > At Wed, 08 Apr 2020 14:19:56 +0900 (JST), Kyotaro Horiguchi <horikyota(dot)ntt(at)gmail(dot)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
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