Re: Weird problem with scatter-gather I/O

[Charles Wilt <charles.wilt@xxxxxxxxx>]

You're not updating a key field you're using to read are you?

Charles

On Mon, Oct 2, 2017 at 1:13 PM, James H. H. Lampert <
jamesl@xxxxxxxxxxxxxxxxx> wrote:

> I've got a main file that has been expanded to include certain fields that
> were once relegated to a (now obsolete) auxiliary file. The relevant fields
> have the same names in both files.
>
> I've got a program that opens both files as full-procedural, and goes
> through the main file, populating the fields in the main file from the
> auxiliary file. It goes through the records of the main file, and for each
> one, it attempts to read the auxiliary record, then (after doing a few
> other things, involving populating certain fields with calculated values)
> updates the main record.
>
> The mere act of doing this with scatter-gather I/O *should* update the
> fields common to the two files. And for the overwhelming majority of
> records, it does.
>
> Somehow, a relative handful of records get missed. The same ones,
> consistently. They get the calculated values, but the common fields aren't
> getting updated.
>
> I've run it in the debugger, and it's not skipping any code.
>
> Any idea why this would happen?
>
> --
> JHHL
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