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

On Wed, Aug 17, 2022 at 2:02 AM Nathan Bossart <nathandbossart(at)gmail(dot)com> wrote:
>
> On Wed, Aug 10, 2022 at 03:28:25PM +0530, Bharath Rupireddy wrote:
> > snprintf(path, sizeof(path), "pg_logical/mappings/%s", mapping_de->d_name);
> > - if (lstat(path, &statbuf) == 0 && !S_ISREG(statbuf.st_mode))
> > + if (get_dirent_type(path, mapping_de, false, LOG) != PGFILETYPE_REG)
> > continue;
>
> Previously, failure to lstat() wouldn't lead to skipping the entry. With
> this patch, a failure to determine the file type will cause the entry to be
> skipped. This might be okay in some places (e.g., CheckPointSnapBuild())
> but not in others. For example, in CheckPointLogicalRewriteHeap(), this
> could cause us to skip fsync-ing a file due to a get_dirent_type() failure,
> which seems bad.

Hm. I corrected it in the v16 patch, please review.

--
Bharath Rupireddy
RDS Open Source Databases: https://aws.amazon.com/rds/postgresql/