Re: Atomic non-durable file write API

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On Sun, Dec 19, 2010 at 5:39 PM, Olaf van der Spek <olafvdspek@xxxxxxxxx> wrote:
> On Sat, Dec 18, 2010 at 11:15 PM, Calvin Walton <calvin.walton@xxxxxxxxx> wrote:
>> Hmm. Iâm doing a little interpretation of what Olaf said here; but I
>> think you may have misunderstood the question?
>>
>> He doesnât care about whether or not the file is securely written to
>> disk (durable); however he doesnât want to see any partially written
>> files. In other words, something like
>>
>> Â Â 1. Write to temp file
>> Â Â 2. Rename temp file over original file
>
> Meta data, including file owner, should be preserved.
> Ideally, no temp files should be visible either.
>
>> Where the rename is only committed to disk once the entire contents of
>> the file have been written securely â whenever that may eventually
>> happen.
>>
>> He doesnât want to synchronously wait for the file to be written,
>> because the new data isnât particularly important. The only important
>> thing is that the file either contains the old or new data after a
>> filesystem crash; not incomplete data. So, itâs more of an ordering
>> problem, I think? (Analogous to putting some sort of barrier between the
>> file write/close and the file rename to maintain ordering.)
>>
>> Hopefully Iâve interpreted the original question correctly, because this
>> is something I would find interesting as well.
>
> Yes, you did.

Somebody?

Olaf
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