Re: Avoid erroring out when unable to remove or parse logical rewrite files to save checkpoint work

On Wed, Aug 17, 2022 at 12:39:26PM +0530, Bharath Rupireddy wrote:
> +    /*
> +     * We're only handling directories here, skip if it's not ours. Also, skip
> +     * if the caller has already performed this check.
> +     */
> +    if (!slot_dir_checked &&
> +        lstat(path, &statbuf) == 0 && !S_ISDIR(statbuf.st_mode))
>          return;

There was previous discussion about removing this stanza from
ReorderBufferCleanupSeralizedTXNs() completely [0].  If that is still
possible, I think I would choose that over having callers specify whether
to do the directory check.

> +        /* we're only handling directories here, skip if it's not one */
> +        sprintf(path, "pg_replslot/%s", logical_de->d_name);
> +        if (get_dirent_type(path, logical_de, false, LOG) != PGFILETYPE_DIR)
> +            continue;

IIUC an error in get_dirent_type() could cause slots to be skipped here,
which is a behavior change.

[0] https://postgr.es/m/20220329224832.GA560657%40nathanxps13

-- 
Nathan Bossart
Amazon Web Services: https://aws.amazon.com