Re: postgresql.conf archive_command example

On Thu, Sep 8, 2011 at 2:05 AM, Fujii Masao <masao(dot)fujii(at)gmail(dot)com> wrote:

> That's an option. But I don't think that finding an existing file is so serious
> problem. The most common cases which cause a partially-filled archived
> file are;
>
> 1. The server crashes while WAL file is being archived, and then the server
>    restarts. In this case, the restarted server would find partially-filled
>    archived file.
>
> 2. In replication environment, the master crashes while WAL file is being
>    archived, and then a failover happens. In this case, new master would
>    find partially-filled archived file.
>
> In these cases, I don't think it's so unsafe to overwrite an existing file.

Personally, I think both of these show examples of why PG should be
looking hard at either providing a simple robust local directory based
archive_command, or very seriously pointing users at properly written
tools like omniptr, or ptrtools, walmgr, etc...

Neither of those cases should ever happen. If you're copying a file
into the archive, and making it appear non-atomically in your archive,
your doing something wrong.

Period.

No excuses.

a.
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