Re: PATCH: Exclude unlogged tables from base backups

>> If a new unlogged relation is created after constructed the
>> unloggedHash before sending file, we cannot exclude such relation. It
>> would not be problem if the taking backup is not long because the new
>> unlogged relation unlikely becomes so large. However, if takeing a
>> backup takes a long time, we could include large main fork in the
>> backup.
>
> This is a good point. It's per database directory which makes it a
> little better, but maybe not by much.
>
> Three options here:
>
> 1) Leave it as is knowing that unlogged relations created during the
> backup may be copied and document it that way.
>
> 2) Construct a list for SendDir() to work against so the gap between
> creating that and creating the unlogged hash is as small as possible.
> The downside here is that the list may be very large and take up a lot
> of memory.
>
> 3) Check each file that looks like a relation in the loop to see if it
> has an init fork. This might affect performance since an
> opendir/readdir loop would be required for every relation.
>
> Personally, I'm in favor of #1, at least for the time being. I've
> updated the docs as indicated in case you and Adam agree.

I agree with #1 and feel the updated docs are reasonable and
sufficient to address this case for now.

I have retested these patches against master at d6ab720360.

All test succeed.

Marking "Ready for Committer".

-Adam