Re: Back-branch update releases coming in a couple weeks

On Thu, Jan 24, 2013 at 11:53 PM, MauMau <maumau307(at)gmail(dot)com> wrote:
> From: "Fujii Masao" <masao(dot)fujii(at)gmail(dot)com>
>>
>> On Thu, Jan 24, 2013 at 7:42 AM, MauMau <maumau307(at)gmail(dot)com> wrote:
>>>
>>> I searched through PostgreSQL mailing lists with "WAL contains references
>>> to
>>> invalid pages", and i found 19 messages. Some people encountered similar
>>> problem. There were some discussions regarding those problems (Tom and
>>> Simon Riggs commented), but those discussions did not reach a solution.
>>>
>>> I also found a discussion which might relate to this problem. Does this
>>> fix
>>> the problem?
>>>
>>> [BUG] lag of minRecoveryPont in archive recovery
>>>
>>> http://www.postgresql.org/message-id/20121206.130458.170549097.horiguchi.kyotaro@lab.ntt.co.jp
>>
>>
>> Yes. Could you check whether you can reproduce the problem on the
>> latest REL9_2_STABLE?
>
>
> I tried to produce the problem by doing "pg_ctl stop -mi" against the
> primary more than ten times on REL9_2_STABLE, but the problem did not
> appear. However, I encountered the crash only once out of dozens of
> failovers, possibly more than a hundred times, on PostgreSQL 9.1.6. So, I'm
> not sure the problem is fixed in REL9_2_STABLE.

You can reproduce the problem in REL9_1_STABLE?

Sorry, I pointed wrong version, i.e., REL9_2_STABLE. Since you encountered
the problem in 9.1.6, you need to retry the test in REL9_1_STABLE.

>
> I'm wondering if the fix discussed in the above thread solves my problem. I
> found the following differences between Horiguchi-san's case and my case:
>
> (1)
> Horiguchi-san says the bug outputs the message:
>
> WARNING: page 0 of relation base/16384/16385 does not exist
>
> On the other hand, I got the message:
>
>
> WARNING: page 506747 of relation base/482272/482304 was uninitialized
>
>
> (2)
> Horiguchi-san produced the problem when he shut the standby immediately and
> restarted it. However, I saw the problem during failover.
>
>
> (3)
> Horiguchi-san did not use any index, but in my case the WARNING message
> refers to an index.
>
>
> But there's a similar point. Horiguchi-san says the problem occurs after
> DELETE+VACUUM. In my case, I shut the primary down while the application
> was doing INSERT/UPDATE. As the below messages show, some vacuuming was
> running just before the immediate shutdown:
>
> ...
> LOG: automatic vacuum of table "GOLD.scm1.tbl1": index scans: 0
> pages: 0 removed, 36743 remain
> tuples: 0 removed, 73764 remain
> system usage: CPU 0.09s/0.11u sec elapsed 0.66 sec
> LOG: automatic analyze of table "GOLD.scm1.tbl1" system usage: CPU
> 0.00s/0.14u sec elapsed 0.32 sec
> LOG: automatic vacuum of table "GOLD.scm1.tbl2": index scans: 0
> pages: 0 removed, 12101 remain
> tuples: 40657 removed, 44142 remain system usage: CPU 0.06s/0.06u sec
> elapsed 0.30 sec
> LOG: automatic analyze of table "GOLD.scm1.tbl2" system usage: CPU
> 0.00s/0.06u sec elapsed 0.14 sec
> LOG: received immediate shutdown request
> ...
>
>
> Could you tell me the details of the problem discussed and fixed in the
> upcoming minor release? I would to like to know the phenomenon and its
> conditions, and whether it applies to my case.

http://www.postgresql.org/message-id/20121206.130458.170549097.horiguchi.kyotaro@lab.ntt.co.jp

Could you read the discussion in the above thread?

Regards,

--
Fujii Masao