On 2/14/19 10:20 AM, Dan van der Ster wrote: > On Thu., Feb. 14, 2019, 6:17 a.m. Wido den Hollander <wido@xxxxxxxx wrote: >> >> Hi, >> >> On a cluster running RGW only I'm running into BlueStore 12.2.11 OSDs >> being 100% busy sometimes. >> >> This cluster has 85k stale indexes (stale-instances list) and I've been >> slowly trying to remove them. >> > > Is your implication here that 'stale-instances rm' isn't going to work > for your case? > No, just saying that I've been running it to remove stale indexes. But suddenly the OSDs are spiking to 100% busy when reading from BlueFS. > (We haven't updated to 12.2.11 yet but have a similar number of stale > instances to remove). > In this case the index pool already went from 222k objects to 186k and is still going down if we run the GC. > For the rest below, I didn't understand *when* are the osd's getting > 100% busy -- is that just during normal operations (after the 12.2.11 > upgrade) or is it while listing the indexes? > Not sure either. For certain Objects this can be triggered by just listing the OMAP keys. This OSD eats all I/O at that moment. > Also, have you already tried compacting the omap on the relevant osds? > I tried that, but on a offline OSD I cancelled it after 25 minutes as it was still running. Not sure yet why this happens on those OSDs. Wido > -- Dan > > >> >> >> I noticed that regularly OSDs read their HDD heavily and that device >> then becomes 100% busy. (iostat) >> >> $ radosgw-admin reshard stale-instances list > stale.json >> $ cat stale.json|jq -r '.[]'|wc -l >> >> I increased debug_bluefs and debug_bluestore to 10 and I found: >> >> 2019-02-14 05:11:18.417097 7f627732d700 10 >> bluestore(/var/lib/ceph/osd/ceph-266) omap_get_header 13.205_head oid >> #13:a05231a1:::.dir.ams02.36062237.821.79:head# = 0 >> 2019-02-14 05:11:18.417127 7f627732d700 10 >> bluestore(/var/lib/ceph/osd/ceph-266) get_omap_iterator 13.205_head >> #13:a05231a1:::.dir.ams02.36062237.821.79:head# >> 2019-02-14 05:11:18.417133 7f627732d700 10 >> bluestore(/var/lib/ceph/osd/ceph-266) get_omap_iterator has_omap = 1 >> >> 2019-02-14 05:11:18.417169 7f627732d700 10 bluefs _read_random h >> 0x560cb77c5080 0x17a8cd0~fba from file(ino 71562 size 0x2d96a43 mtime >> 2019-02-14 02:52:16.370746 bdev 1 allocated 2e00000 extents >> [1:0x3228f00000+2e00000]) >> 2019-02-14 05:11:23.129645 7f627732d700 10 bluefs _read_random h >> 0x560c14167780 0x17bb6b7~f52 from file(ino 68900 size 0x41919ef mtime >> 2019-02-01 01:19:59.216218 bdev 1 allocated 4200000 extents >> [1:0x8b31a00000+200000,1:0x8b31e00000+e00000,1:0x8b32d00000+1700000,1:0x8b3ce00000+1b00000]) >> 2019-02-14 05:11:23.144550 7f627732d700 10 bluefs _read_random h >> 0x560c14c86b80 0x96d020~ef3 from file(ino 67189 size 0x419b603 mtime >> 2019-02-01 00:45:12.743836 bdev 1 allocated 4200000 extents >> [1:0x53da9a00000+4200000]) >> >> 2019-02-14 05:11:23.149958 7f627732d700 10 >> bluestore(/var/lib/ceph/osd/ceph-266) omap_get_header 13.e8_head oid >> #13:171bcbd3:::.dir.ams02.39023047.682.114:head# = 0 >> 2019-02-14 05:11:23.149975 7f627732d700 10 >> bluestore(/var/lib/ceph/osd/ceph-266) get_omap_iterator 13.e8_head >> #13:171bcbd3:::.dir.ams02.39023047.682.114:head# >> 2019-02-14 05:11:23.149981 7f627732d700 10 >> bluestore(/var/lib/ceph/osd/ceph-266) get_omap_iterator has_omap = 1 >> >> 2019-02-14 05:11:23.150012 7f627732d700 10 bluefs _read_random h >> 0x560c14e42500 0x1a18670~ff0 from file(ino 71519 size 0x417a60f mtime >> 2019-02-14 02:51:35.125629 bdev 1 allocated 4200000 extents >> [1:0x1c30d00000+4200000]) >> 2019-02-14 05:11:23.155679 7f627732d700 10 bluefs _read_random h >> 0x560c1c1ab980 0xedad4c~fde from file(ino 71391 size 0x25d4a89 mtime >> 2019-02-13 22:25:22.801676 bdev 1 allocated 2600000 extents >> [1:0x38b00000+2600000]) >> 2019-02-14 05:11:23.158995 7f627732d700 10 bluefs _read_random h >> 0x560c1c1ab980 0xedbd2a~fba from file(ino 71391 size 0x25d4a89 mtime >> 2019-02-13 22:25:22.801676 bdev 1 allocated 2600000 extents >> [1:0x38b00000+2600000]) >> 2019-02-14 05:11:23.159233 7f627732d700 10 bluefs _read_random h >> 0x560c14c86b80 0x96df13~fca from file(ino 67189 size 0x419b603 mtime >> 2019-02-01 00:45:12.743836 bdev 1 allocated 4200000 extents >> [1:0x53da9a00000+4200000]) >> 2019-02-14 05:11:23.159456 7f627732d700 10 bluefs _read_random h >> 0x560c14c86b80 0x96eedd~f1b from file(ino 67189 size 0x419b603 mtime >> 2019-02-01 00:45:12.743836 bdev 1 allocated 4200000 extents >> [1:0x53da9a00000+4200000]) >> 2019-02-14 05:11:23.159639 7f627732d700 10 bluefs _read_random h >> 0x560c14c86b80 0x96fdf8~eba from file(ino 67189 size 0x419b603 mtime >> 2019-02-01 00:45:12.743836 bdev 1 allocated 4200000 extents >> [1:0x53da9a00000+4200000]) >> >> After this the _random_read just continues for thousands of lines and >> the OSD becomes very slow. Slow requests, heartbeat timeouts and even >> OSDs being marked as down. >> >> So I tried to list the omap keys: >> >> $ rados -p .rgw.buckets.index listomapkeys .dir.ams02.36062237.821.79 >> $ rados -p .rgw.buckets.index listomapkeys .dir.ams02.39023047.682.114 >> >> .dir.ams02.36062237.821.79: <1s >> .dir.ams02.39023047.682.114: ~30s >> >> Both objects are on the same OSD (266), but if I list the omapkeys for >> the last Object the disk jumps to 100% busy and stays there for ~1min. >> >> I've seen this before with RBD and SSD-backed OSDs where on a omap key >> list the disks would jump to 100% busy and cause slow requests. >> >> This case seems very similar to that one. >> >> I can keep triggering it in this case by listing the omap keys for >> object .dir.ams02.39023047.682.114, which doesn't have any keys though. >> >> Has anybody seen this before? >> >> Some information: >> >> - Ceph 12.2.11 >> - BlueStore (default memory target of 4G) >> - RGW-only use-case >> - WAL+DB+DATA on HDD >> >> Thanks, >> >> Wido >> >> _______________________________________________ >> ceph-users mailing list >> ceph-users@xxxxxxxxxxxxxx >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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