On Mon, Apr 8, 2019 at 3:19 PM Bryan Stillwell <bstillw...@godaddy.com> wrote:
>
> We have two separate RGW clusters running Luminous (12.2.8) that have started
> seeing an increase in PGs going active+clean+inconsistent with the reason
> being caused by an omap_digest mismatch. Both clusters are using FileStore
> and the inconsistent PGs are happening on the .rgw.buckets.index pool which
> was moved from HDDs to SSDs within the last few months.
>
> We've been repairing them by first making sure the odd omap_digest is not the
> primary by setting the primary-affinity to 0 if needed, doing the repair, and
> then setting the primary-affinity back to 1.
>
> For example PG 7.3 went inconsistent earlier today:
>
> # rados list-inconsistent-obj 7.3 -f json-pretty | jq -r '.inconsistents[] |
> .errors, .shards'
> [
> "omap_digest_mismatch"
> ]
> [
> {
> "osd": 504,
> "primary": true,
> "errors": [],
> "size": 0,
> "omap_digest": "0x4c10ee76",
> "data_digest": "0xffffffff"
> },
> {
> "osd": 525,
> "primary": false,
> "errors": [],
> "size": 0,
> "omap_digest": "0x26a1241b",
> "data_digest": "0xffffffff"
> },
> {
> "osd": 556,
> "primary": false,
> "errors": [],
> "size": 0,
> "omap_digest": "0x26a1241b",
> "data_digest": "0xffffffff"
> }
> ]
>
> Since the odd omap_digest is on osd.504 and osd.504 is the primary, we would
> set the primary-affinity to 0 with:
>
> # ceph osd primary-affinity osd.504 0
>
> Do the repair:
>
> # ceph pg repair 7.3
>
> And then once the repair is complete we would set the primary-affinity back
> to 1 on osd.504:
>
> # ceph osd primary-affinity osd.504 1
>
> There doesn't appear to be any correlation between the OSDs which would point
> to a hardware issue, and since it's happening on two different clusters I'm
> wondering if there's a race condition that has been fixed in a later version?
>
> Also, what exactly is the omap digest? From what I can tell it appears to be
> some kind of checksum for the omap data. Is that correct?
Yeah; it's just a crc over the omap key-value data that's checked
during deep scrub. Same as the data digest.
I've not noticed any issues around this in Luminous but I probably
wouldn't have, so will have to leave it up to others if there are
fixes in since 12.2.8.
-Greg
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