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help / color / mirror / Atom feedFrom: Tom Lane <[email protected]>
To: Tomas Vondra <[email protected]>
Cc: Bharath Rupireddy <[email protected]>
Cc: [email protected] <[email protected]>
Cc: PostgreSQL Hackers <[email protected]>
Subject: Re: Fdw batch insert error out when set batch_size > 65535
Date: Wed, 09 Jun 2021 02:28:29 -0400
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
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I wrote:
> Bharath Rupireddy <[email protected]> writes:
>>> I've added a simple regression test to postgres_fdw, testing that batch
>>> sizes > 65535 work fine, and pushed the fix.
>> I was earlier thinking of adding one, but stopped because it might
>> increase the regression test execution time. It looks like that's true
>> - with and without the test case it takes 17 sec and 4 sec
>> respectively on my dev system which is 4X slower. I'm not sure if this
>> is okay.
> The cost, versus the odds of ever detecting a problem, doesn't
> seem like a good tradeoff.
I took a quick look and noted that on buildfarm member longfin
(to take a random example that's sitting a few feet from me),
the time for contrib-install-check went from 34 seconds before
this patch to 40 seconds after. I find that completely
unacceptable compared to the likely value of this test case.
regards, tom lane
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Subject: Re: Fdw batch insert error out when set batch_size > 65535
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