We do have our nf_conntrack_max set to 1048576, but our count is actually only between 65k and 101k, so your 256k is probably fine. You'd have noticed in dmesg anyway, I figure, but I thought I'd mention it.
I am out of ideas. :)
Jordan
On Wed, Sep 20, 2017 at 1:28 PM, David Turner <drakonstein@xxxxxxxxx> wrote:
We have been running with the following settings for months for pid_max and conntrack_max. Are these at values you would deem too low?kernel.pid_max = 4194303net.nf_conntrack_max = 262144I went back in the logs to see where the slow requests and timeouts started. It seems to have come out of nowhere. I included the log for 8 minutes prior to the osd op thread time outs and 8.5 minutes before the first slow request message. I don't see any indicators at all that it was scrubbing or anything. I'm also not seeing any SMART errors on the drives.2017-09-19 01:14:25.539030 7f134326a700 1 leveldb: Delete type=2 #1250882017-09-19 01:16:25.544797 7f134326a700 1 leveldb: Level-0 table #125303: started2017-09-19 01:16:25.571103 7f134326a700 1 leveldb: Level-0 table #125303: 1509406 bytes OK2017-09-19 01:16:25.572424 7f134326a700 1 leveldb: Delete type=0 #1252772017-09-19 01:18:14.329887 7f134326a700 1 leveldb: Level-0 table #125305: started2017-09-19 01:18:14.359580 7f134326a700 1 leveldb: Level-0 table #125305: 1503050 bytes OK2017-09-19 01:18:14.361107 7f134326a700 1 leveldb: Delete type=0 #1253022017-09-19 01:20:13.239215 7f134326a700 1 leveldb: Level-0 table #125307: started2017-09-19 01:20:13.268553 7f134326a700 1 leveldb: Level-0 table #125307: 1500713 bytes OK2017-09-19 01:20:13.270018 7f134326a700 1 leveldb: Delete type=0 #1253042017-09-19 01:22:24.023066 7f13c142b700 1 heartbeat_map is_healthy 'OSD::osd_op_tp thread 0x7f139a4e0700' had timed out after 152017-09-19 01:22:24.023081 7f13c142b700 1 heartbeat_map is_healthy 'OSD::osd_op_tp thread 0x7f139ace1700' had timed out after 15--- this lines repeated thousands of times before we see the first slow request message ---2017-09-19 01:22:37.770750 7f134ddac700 1 heartbeat_map is_healthy 'OSD::osd_op_tp thread 0x7f139d4e6700' had timed out after 152017-09-19 01:22:37.770751 7f134ddac700 1 heartbeat_map is_healthy 'OSD::osd_op_tp thread 0x7f139e4e8700' had timed out after 152017-09-19 01:22:37.772928 7f13bc0b6700 0 log_channel(cluster) log [WRN] : 25 slow requests, 5 included below; oldest blocked for > 30.890114 secs2017-09-19 01:22:37.772946 7f13bc0b6700 0 log_channel(cluster) log [WRN] : slow request 30.726969 seconds old, received at 2017-09-19 01:22:07.045866: MOSDECSubOpWrite(97.2ebs4 48111 ECSubWrite(tid=6428263, reqid=client.12636870.0:480468942, at_version=48111'1958916, trim_to=48066'1955886, trim_rollback_to=48111' 1958910)) currently started 2017-09-19 01:22:37.772957 7f13bc0b6700 0 log_channel(cluster) log [WRN] : slow request 30.668230 seconds old, received at 2017-09-19 01:22:07.104606: MOSDECSubOpWrite(97.2ebs4 48111 ECSubWrite(tid=6428264, reqid=client.12636870.0:480468943, at_version=48111'1958917, trim_to=48066'1955886, trim_rollback_to=48111' 1958910)) currently started 2017-09-19 01:22:37.772984 7f13bc0b6700 0 log_channel(cluster) log [WRN] : slow request 30.057066 seconds old, received at 2017-09-19 01:22:07.715770: MOSDECSubOpWrite(97.2e6s2 48111 ECSubWrite(tid=3560867, reqid=client.18422767.0:328744332, at_version=48111'1953782, trim_to=48066'1950689, trim_rollback_to=48111' 1953780)) currently started 2017-09-19 01:22:37.772989 7f13bc0b6700 0 log_channel(cluster) log [WRN] : slow request 30.664709 seconds old, received at 2017-09-19 01:22:07.108126: MOSDECSubOpWrite(97.2ebs4 48111 ECSubWrite(tid=6428265, reqid=client.12636870.0:480468944, at_version=48111'1958918, trim_to=48066'1955886, trim_rollback_to=48111' 1958910)) currently started 2017-09-19 01:22:37.773000 7f13bc0b6700 0 log_channel(cluster) log [WRN] : slow request 30.657596 seconds old, received at 2017-09-19 01:22:07.115240: MOSDECSubOpWrite(97.51s3 48111 ECSubWrite(tid=5500858, reqid=client.24892528.0:35633485, at_version=48111'1958524, trim_to=48066'1955458, trim_rollback_to=48111' 1958513)) currently started 2017-09-19 01:22:37.785581 7f1381ee9700 1 heartbeat_map is_healthy 'OSD::osd_op_tp thread 0x7f139a4e0700' had timed out after 152017-09-19 01:22:37.785583 7f1381ee9700 1 heartbeat_map is_healthy 'OSD::osd_op_tp thread 0x7f139ace1700' had timed out after 15On Tue, Sep 19, 2017 at 7:31 PM Jordan Share <jordan.share@xxxxxxxxx> wrote:We had suicide timeouts, but unfortunately I can't remember the specific root cause at this point.It was definitely one of two things:* too low of net.netfilter.nf_conntrack_max (preventing the osds from opening new connections to each other)* too low of kernel.pid_max or kernel.threads-max (preventing new threads from starting)I am pretty sure we hit the pid_max early on, but the conntrack_max didn't cause trouble until we had enough VMs running to push the total number of connections past the default limit.Our cluster is approximately the same size as yours.JordanOn Tue, Sep 19, 2017 at 3:05 PM, Stanley Zhang <stanley.zhang@xxxxxxxxxxxx> wrote:We don't use EC pools, but my experience with similar slow requests on RGW+replicated_pools is that in the logs you need to find out the first slow request and identify where it's from, for example, is it deep-scrub, or some client accessing corrupted objects, disk errors etc.
On 20/09/17 8:13 AM, David Turner wrote:
Just starting 3 nights ago we started seeing OSDs randomly going down in our cluster (Jewel 10.2.7). At first I saw that each OSD that was recently marked down in the cluster (`ceph osd dump | grep -E '^osd\.[0-9]+\s' | sort -nrk11` sorted list of OSDs by which OSDs have been marked down in the most recent OSD map epochs) and all of them had been wrongly marked down. Prior to this there is a lot of evidence of slow requests, OSD op thread timing out, Filestore op thread timing out, and other errors. At the bottom of the email is an excerpt of such errors. It is definitely not a comprehensive log of these errors.
The map epoch of the last time the OSD is marked down in the OSD map matches when it logs that it was wrongly marked down. After thousands more lines of op threads timing out and slow requests, the OSD finally asserts with "hit suicide timeout". The first 2 nights this was localized to 2 osds on the same host, but last night this happened on an osd that is on a second host. 2 of the 3 OSDs have hit this 3 times and the other has hit it twice.
There are 15 OSD nodes and 224 total OSDs in the cluster. So far only these 3 OSDs have hit this FAILED assert. Does anyone have any ideas of what to do next? Or have any information that is missing here to be able to understand things further? It's too intermittent to run the OSD with log level 20.
2017-09-19 02:06:19.712334 7fdfeae86700 1 heartbeat_map is_healthy 'OSD::osd_op_tp thread 0x7fdfc7235700' had timed out after 152017-09-19 02:06:19.712358 7fdfeae86700 1 heartbeat_map is_healthy 'FileStore::op_tp thread 0x7fdfde58f700' had timed out after 602017-09-19 02:06:55.974099 7fdfe5b11700 0 log_channel(cluster) log [WRN] : 891 slow requests, 5 included below; oldest blocked for > 150.987639 secs2017-09-19 02:06:55.974114 7fdfe5b11700 0 log_channel(cluster) log [WRN] : slow request 150.985487 seconds old, received at 2017-09-19 02:04:24.987412: MOSDECSubOpWrite(97.f8s5 48121 ECSubWrite(tid=4204267, reqid=client.24351228.0:139832730, at_version=48121'1955383, trim_to=48111'1952339, trim_rollback_to=48121' 1955373)) currently started 2017-09-19 02:06:55.974123 7fdfe5b11700 0 log_channel(cluster) log [WRN] : slow request 150.510718 seconds old, received at 2017-09-19 02:04:25.462180: MOSDECSubOpWrite(97.4es1 48121 ECSubWrite(tid=5407590, reqid=client.24892528.0:36410074, at_version=48121'1960640, trim_to=48111'1957612, trim_rollback_to=48121' 1960635)) currently started 2017-09-19 02:06:55.974128 7fdfe5b11700 0 log_channel(cluster) log [WRN] : slow request 149.177285 seconds old, received at 2017-09-19 02:04:26.795614: MOSDECSubOpWrite(97.1f4s1 48121 ECSubWrite(tid=8793253, reqid=client.24892528.0:36410582, at_version=48121'1964351, trim_to=48111'1961282, trim_rollback_to=48121' 1964344)) currently queued_for_pg 2017-09-19 02:06:55.974134 7fdfe5b11700 0 log_channel(cluster) log [WRN] : slow request 147.359320 seconds old, received at 2017-09-19 02:04:28.613578: MOSDECSubOpWrite(97.8s5 48121 ECSubWrite(tid=3228587, reqid=client.18422767.0:329511916, at_version=48121'1965073, trim_to=48111'1962055, trim_rollback_to=48121' 1965066)) currently queued_for_pg 2017-09-19 02:06:55.974139 7fdfe5b11700 0 log_channel(cluster) log [WRN] : slow request 146.404241 seconds old, received at 2017-09-19 02:04:29.568657: MOSDECSubOpWrite(97.f8s5 48121 ECSubWrite(tid=4204291, reqid=client.18422767.0:329512018, at_version=48121'1955389, trim_to=48111'1952339, trim_rollback_to=48121' 1955377)) currently queued_for_pg 2017-09-19 02:06:55.974276 7fdf7aa6a700 0 -- 10.10.113.29:6826/3332721 >> 10.10.13.32:6822/130263 pipe(0x7fe003b1c800 sd=67 :24892 s=1 pgs=7268 cs=1 l=0 c=0x7fe01b44be00).connect got RESETSESSION2017-09-19 02:06:55.974626 7fdf78141700 0 -- 10.10.13.29:6826/3332721 >> 10.10.13.33:6802/2651380 pipe(0x7fe008140800 sd=70 :61127 s=1 pgs=7059 cs=1 l=0 c=0x7fe01be72600).connect got RESETSESSION2017-09-19 02:06:55.974657 7fdf78e4e700 0 -- 10.10.13.29:6826/3332721 >> 10.10.13.35:6827/477826 pipe(0x7fe004aef400 sd=91 :19464 s=1 pgs=7316 cs=1 l=0 c=0x7fe01b179080).connect got RESETSESSION2017-09-19 02:06:55.977120 7fdf95310700 0 -- 10.10.13.29:6826/3332721 >> 10.10.13.22:6812/2276428 pipe(0x7fe003d15400 sd=86 :58892 s=1 pgs=15908 cs=1 l=0 c=0x7fe01b2e1500).connect got RESETSESSION2017-09-19 02:06:55.979722 7fdf9500d700 0 -- 10.10.13.29:6826/3332721 >> 10.10.13.27:6830/2018590 pipe(0x7fe003a06800 sd=98 :42191 s=1 pgs=12697 cs=1 l=0 c=0x7fe01b44d780).connect got RESETSESSION2017-09-19 02:06:56.106436 7fdfba1dc700 0 -- 10.10.13.29:6826/3332721 >> 10.10.13.27:6811/2018593 pipe(0x7fe009e79400 sd=137 :54582 s=1 pgs=11500 cs=1 l=0 c=0x7fe005820880).connect got RESETSESSION2017-09-19 02:06:56.107146 7fdfbbaf5700 0 -- 10.10.13.29:6826/3332721 >> 10.10.13.27:6811/2018593 pipe(0x7fe009e79400 sd=137 :54582 s=2 pgs=11602 cs=1 l=0 c=0x7fe005820880).fault, initiating reconnect---2017-09-19 02:06:56.213980 7fdfdd58d700 0 log_channel(cluster) log [WRN] : map e48123 wrongly marked me down
---2017-09-19 03:06:34.778837 7fdfeae86700 1 heartbeat_map is_healthy 'FileStore::op_tp thread 0x7fdfde58f700' had timed out after 602017-09-19 03:06:34.778840 7fdfeae86700 1 heartbeat_map is_healthy 'FileStore::op_tp thread 0x7fdfddd8e700' had timed out after 602017-09-19 03:06:39.778908 7fdfeae86700 1 heartbeat_map is_healthy 'OSD::osd_op_tp thread 0x7fdfc422f700' had timed out after 152017-09-19 03:06:39.778921 7fdfeae86700 1 heartbeat_map is_healthy 'OSD::osd_op_tp thread 0x7fdfc5231700' had timed out after 152017-09-19 03:06:39.778930 7fdfeae86700 1 heartbeat_map is_healthy 'OSD::osd_op_tp thread 0x7fdfc5231700' had suicide timed out after 1502017-09-19 03:06:39.782749 7fdfeae86700 -1 common/HeartbeatMap.cc: In function 'bool ceph::HeartbeatMap::_check(const ceph::heartbeat_handle_d*, const char*, time_t)' thread 7fdfeae86700 time 2017-09-19 03:06:39.778940common/HeartbeatMap.cc: 86: FAILED assert(0 == "hit suicide timeout")
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