Re: Theory about XLogFlush startup failures - Mailing list pgsql-hackers

From Tom Lane
Subject Re: Theory about XLogFlush startup failures
Date
Msg-id 22510.1011070696@sss.pgh.pa.us
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In response to Theory about XLogFlush startup failures  (Tom Lane <tgl@sss.pgh.pa.us>)
Responses Re: Theory about XLogFlush startup failures  (Tom Lane <tgl@sss.pgh.pa.us>)
List pgsql-hackers
Hiroshi Inoue <Inoue@tpf.co.jp> writes:
> Tom Lane wrote:
>> I know PageRepairFragmentation is real paranoid about this, because I
>> made it so recently.  I suppose it might be worth adding some more
>> sanity checks to PageAddItem, maybe PageZero (is that ever called on a
>> pre-existing page?), and PageIndexTupleDelete.  Seems like that should
>> about cover it --- noplace else inserts items on disk pages or
>> reshuffles disk page contents, AFAIK.

> What about PageGetItem ? It seems to be able to touch the item
> via HeapTupleSatisfies etc. 

Hmm.  Strictly speaking I think you are right, but I'm hesitant to add a
bunch of new tests to PageGetItem --- that is much more of a hot spot
than PageAddItem, and it'll cost us something in speed I fear.
        regards, tom lane


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