please check if 4.00000000 has omap header and xattrs rados -p hpcfs_data listxattr 4.00000000 rados -p hpcfs_data getomapheader 4.00000000 On Mon, Mar 18, 2019 at 7:37 PM Dylan McCulloch <dmc@xxxxxxxxxxxxxx> wrote: > > >> > > >> >cephfs does not create/use object "4.00000000". Please show us some > >> >of its keys. > >> > > >> > >> https://pastebin.com/WLfLTgni > >> Thanks > >> > > Is the object recently modified? > > > >rados -p hpcfs_metadata stat 4.00000000 > > > > $ rados -p hpcfs_metadata stat 4.00000000 > hpcfs_metadata/4.00000000 mtime 2018-09-17 08:11:50.000000, size 0 > rados -p hpcfs_metadata getomapheader 4.00000000 > >> >On Mon, Mar 18, 2019 at 4:16 PM Dylan McCulloch <dmc@xxxxxxxxxxxxxx> wrote: > >> >> > >> >> Hi all, > >> >> > >> >> We have a large omap object warning on one of our Ceph clusters. > >> >> The only reports I've seen regarding the "large omap objects" warning from other users were related to RGW bucket sharding, however we do not have RGW configured on this cluster. > >> >> The large omap object ~10GB resides in a CephFS metadata pool. > >> >> > >> >> It's perhaps worth mentioning that we had to perform disaster recovery steps [1] on this cluster last year after a network issue, so we're not sure whether this large omap object is a result of those previous recovery processes or whether it's completely unrelated. > >> >> > >> >> Ceph version: 12.2.8 > >> >> osd_objectstore: Bluestore > >> >> RHEL 7.5 > >> >> Kernel: 4.4.135-1.el7.elrepo.x86_64 > >> >> > >> >> We have set: "mds_bal_fragment_size_max": "500000" (Default 100000) > >> >> > >> >> $ ceph health detail > >> >> HEALTH_WARN 1 large omap objects > >> >> LARGE_OMAP_OBJECTS 1 large omap objects > >> >> 1 large objects found in pool 'hpcfs_metadata' > >> >> Search the cluster log for 'Large omap object found' for more details. > >> >> > >> >> # Find pg with large omap object > >> >> $ for i in `ceph pg ls-by-pool hpcfs_metadata | tail -n +2 | awk '{print $1}'`; do echo -n "$i: "; ceph pg $i query |grep num_large_omap_objects | head -1 | awk '{print $2}'; done | grep ": 1" > >> >> 20.103: 1 > >> >> > >> >> # OSD log entry showing relevant object > >> >> osd.143 osd.143 172.26.74.23:6826/3428317 1380 : cluster [WRN] Large omap object found. Object: 20:c0ce80d4:::4.00000000:head Key count: 24698995 Size (bytes): 11410935690 > >> >> > >> >> # Confirm default warning thresholds for large omap object > >> >> $ ceph daemon osd.143 config show | grep osd_deep_scrub_large_omap > >> >> "osd_deep_scrub_large_omap_object_key_threshold": "2000000", > >> >> "osd_deep_scrub_large_omap_object_value_sum_threshold": "1073741824", > >> >> > >> >> # Dump keys/values of problematic object, creates 46.65GB file > >> >> $ rados -p hpcfs_metadata listomapvals '4.00000000' > /tmp/hpcfs_metadata_object_omap_vals_4.00000000_20190304 > >> >> $ ll /tmp/hpcfs_metadata_object_omap_vals_4.00000000_20190304 > >> >> -rw-r--r-- 1 root root 50089561860 Mar 4 18:16 /tmp/hpcfs_metadata_object_omap_vals_4.00000000_20190304 > >> >> > >> >> # Confirm key count matches OSD log entry warning > >> >> $ rados -p hpcfs_metadata listomapkeys '4.00000000' | wc -l > >> >> 24698995 > >> >> > >> >> # The omap keys/vals for that object appear to have been unchanged/static for at least a couple of months: > >> >> $ sha1sum /tmp/hpcfs_metadata_object_omap_vals_4.00000000_20190304 > >> >> fd00ceb68607b477626178b2d81fefb926460107 /tmp/hpcfs_metadata_object_omap_vals_4.00000000_20190304 > >> >> $ sha1sum /tmp/hpcfs_metadata_object_omap_vals_4_00000000_20190108 > >> >> fd00ceb68607b477626178b2d81fefb926460107 /tmp/hpcfs_metadata_object_omap_vals_4_00000000_20190108 > >> >> > >> >> I haven't gone through all 24698995 keys yet, but while most appear to relate to objects in the hpcfs_data CephFS data pool, there are a significant number of keys (rough guess 25%) that don't appear to have corresponding objects in the hpcfs_data pool. > >> >> > >> >> Any assistance or pointers to troubleshoot further would be very much appreciated. > >> >> > >> >> Thanks, > >> >> Dylan > >> >> > >> >> [1] http://docs.ceph.com/docs/luminous/cephfs/disaster-recovery/ > >> >> > >> >> _______________________________________________ > >> >> ceph-users mailing list > >> >> ceph-users@xxxxxxxxxxxxxx > >> >> https://protect-au.mimecast.com/s/sfrDCq7By5sN9Nv1sQbY6q?domain=lists.ceph.com _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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