Re: Unexpected behaviour after monitors upgrade from Jewel to Luminous

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On Wed, Aug 22, 2018 at 6:35 AM Adrien Gillard <gillard.adrien@xxxxxxxxx> wrote:
Hi everyone,

We have a hard time figuring out a behaviour encountered after upgrading the monitors of one of our cluster from Jewel to Luminous yesterday.

The cluster is composed of 14 OSDs hosts (2xE5-2640 v3 and 64 GB of RAM), each containing 12x4TB OSD with journals on DC grade SSDs). The cluster was installed in Infernalis and upgraded to Jewel. We mainly use it for RBD with a cache tier in front of an EC pool.

We started the upgrade from Jewel 10.2.10 to Luminous 12.2.7 yesterday afternoon with the monitors and the provisionning of the MGR. We were planning on upgrading the OSD servers today.
All went well until the cluster received the following commands, a few hours after the upgrade :

ceph osd pool set pool-cache-01 target_max_bytes 0
ceph osd pool set pool-cache-02 target_max_bytes 0  

(The context here is that we use this cluster for backups and set target_max_bytes to 0 to stop the flush and give maximum ressources to the backups IOs)

Below is an extract from the logs of one of the monitors.
The cluster started exchanging a lot over the cluster network, apparently backfill/recovery and multiple Gbits/s, in an amount which we've never seen before. Due to some network uplinks sub-sizing, the traffic could not be handled well and this lead to OSDs crashing. 

This really doesn't make a ton of sense — you're saying that by telling the cluster to *stop* doing flushing IO, everything went bad? In terms of root causing the issue you'll obviously want to focus on that, although it may or may not be helpful in recovering things at this point.

Do keep in mind that users running cache-tiering are increasingly uncommon, and while we still test it we aren't expanding that coverage and would really like to remove and replace that functionality, so you're out on the far edge of things here. :/

Finally, if you're still experiencing OOM issues, you may want to set the "nodown" flag — that will prevent OSDs being marked down, which obviously will stall IO and peering if they go down anyway, but will prevent spamming map updates that cause the cluster to OOM again.
-Greg
 

At the moment we are still investigating the logs to try to understand what happened exactly. The cluster is down. When we restart the OSDs, PG start activating and peering but at some point all the RAM and swap of the servers is consumed and OSDs crash.
I tried to set the ovious cluster parameters (osd_recovery_max_active=1, osd_recovery_threads=1, osd_max_backfills=1) and norecover, nobackfill, but when the OSDs start, we still see 4 or 5 Gbits/s over the cluster network.

We are currently reconfiguring the network to try to remove the bandwith problem and are preparing to add more RAM to the servers.

But still, I have a couple of questions :

 - Has anyone encoutered the issue we have with the cache ? Or have a possible explanation ?
 - Is it normal to observe so much traffic on the cluster network when the PG are activating / peering with norecover and nobackfill set ?

Thank you for reading and for your input !
 

2018-08-21 21:05:02.766969 7f10de377700  0 log_channel(cluster) log [INF] : pgmap 6208 pgs: 6208 active+clean; 261 TB data, 385 TB used, 225 TB / 611 TB avail; 298 MB/s rd, 212 MB/s wr, 456 op/s
2018-08-21 21:05:03.805124 7f10de377700  0 log_channel(cluster) log [INF] : pgmap 6208 pgs: 6208 active+clean; 261 TB data, 385 TB used, 225 TB / 611 TB avail; 296 MB/s rd, 193 MB/s wr, 433 op/s
2018-08-21 21:05:03.870690 7f10d83cc700  0 mon.clb-cph-frpar2-mon-01@0(leader) e6 handle_command mon_command({"var": "target_max_bytes", "prefix": "osd pool set", "pool": "pool-cache-02", "val": "0"} v 0
) v1
2018-08-21 21:05:03.870749 7f10d83cc700  0 log_channel(audit) log [INF] : from='client.146529236 -' entity='client.admin' cmd=[{"var": "target_max_bytes", "prefix": "osd pool set", "pool": "pool-cache-02
", "val": "0"}]: dispatch
2018-08-21 21:05:03.913663 7f10d83cc700  0 mon.clb-cph-frpar2-mon-01@0(leader) e6 handle_command mon_command({"prefix": "osd pool stats", "format": "json"} v 0) v1
2018-08-21 21:05:03.913745 7f10d83cc700  0 log_channel(audit) log [DBG] : from='client.? 10.25.25.3:0/4101432770' entity='client.admin' cmd=[{"prefix": "osd pool stats", "format": "json"}]: dispatch
2018-08-21 21:05:04.042835 7f10d83cc700  0 mon.clb-cph-frpar2-mon-01@0(leader) e6 handle_command mon_command({"var": "target_max_bytes", "prefix": "osd pool set", "pool": "pool-cache-01", "val": "0"} v 0
) v1
2018-08-21 21:05:04.042894 7f10d83cc700  0 log_channel(audit) log [INF] : from='client.146565481 -' entity='client.admin' cmd=[{"var": "target_max_bytes", "prefix": "osd pool set", "pool": "pool-cache-01
", "val": "0"}]: dispatch
2018-08-21 21:05:04.813217 7f10de377700  0 log_channel(cluster) log [INF] : pgmap 6208 pgs: 6208 active+clean; 261 TB data, 385 TB used, 225 TB / 611 TB avail; 271 MB/s rd, 181 MB/s wr, 415 op/s
2018-08-21 21:05:04.821486 7f10de377700  1 mon.clb-cph-frpar2-mon-01@0(leader).osd e114693 e114693: 168 total, 168 up, 168 in
2018-08-21 21:05:04.821711 7f10de377700  0 mon.clb-cph-frpar2-mon-01@0(leader).osd e114693 crush map has features 432365734501548032, adjusting msgr requires
2018-08-21 21:05:04.823032 7f10de377700  1 mon.clb-cph-frpar2-mon-01@0(leader).osd e114693 create_pending setting backfillfull_ratio = 0.9
2018-08-21 21:05:04.823156 7f10de377700  0 log_channel(audit) log [INF] : from='client.146529236 -' entity='client.admin' cmd='[{"var": "target_max_bytes", "prefix": "osd pool set", "pool": "pool-cache-0
2", "val": "0"}]': finished
2018-08-21 21:05:04.823280 7f10de377700  0 log_channel(audit) log [INF] : from='client.146565481 -' entity='client.admin' cmd='[{"var": "target_max_bytes", "prefix": "osd pool set", "pool": "pool-cache-0
1", "val": "0"}]': finished
2018-08-21 21:05:04.825528 7f10de377700  0 log_channel(cluster) log [DBG] : osdmap e114693: 168 total, 168 up, 168 in
2018-08-21 21:05:04.844932 7f10de377700  0 log_channel(cluster) log [INF] : pgmap 6208 pgs: 6208 active+clean; 261 TB data, 385 TB used, 225 TB / 611 TB avail; 275 MB/s rd, 192 MB/s wr, 429 op/s
2018-08-21 21:05:05.873682 7f10de377700  0 log_channel(cluster) log [INF] : pgmap 6208 pgs: 187 peering, 6021 active+clean; 261 TB data, 385 TB used, 225 TB / 611 TB avail; 220 MB/s rd, 188 MB/s wr, 383
op/s
2018-08-21 21:05:05.895414 7f10de377700  1 mon.clb-cph-frpar2-mon-01@0(leader).osd e114694 e114694: 168 total, 168 up, 168 in
2018-08-21 21:05:05.895721 7f10de377700  0 mon.clb-cph-frpar2-mon-01@0(leader).osd e114694 crush map has features 432365734501548032, adjusting msgr requires
2018-08-21 21:05:05.905473 7f10de377700  1 mon.clb-cph-frpar2-mon-01@0(leader).osd e114694 create_pending setting backfillfull_ratio = 0.9
2018-08-21 21:05:05.940729 7f10de377700  0 log_channel(cluster) log [DBG] : osdmap e114694: 168 total, 168 up, 168 in
2018-08-21 21:05:05.947921 7f10de377700  0 log_channel(cluster) log [INF] : pgmap 6208 pgs: 204 peering, 6004 active+clean; 261 TB data, 385 TB used, 225 TB / 611 TB avail; 201 MB/s rd, 200 MB/s wr, 355
op/s
2018-08-21 21:05:06.912752 7f10de377700  1 mon.clb-cph-frpar2-mon-01@0(leader).osd e114695 e114695: 168 total, 168 up, 168 in
2018-08-21 21:05:06.913104 7f10de377700  0 mon.clb-cph-frpar2-mon-01@0(leader).osd e114695 crush map has features 432365734501548032, adjusting msgr requires
2018-08-21 21:05:06.928521 7f10de377700  1 mon.clb-cph-frpar2-mon-01@0(leader).osd e114695 create_pending setting backfillfull_ratio = 0.9
2018-08-21 21:05:06.968793 7f10de377700  0 log_channel(cluster) log [DBG] : osdmap e114695: 168 total, 168 up, 168 in
2018-08-21 21:05:07.001112 7f10d93ce700  1 heartbeat_map reset_timeout 'Monitor::cpu_tp thread 0x7f10d93ce700' had timed out after 0
2018-08-21 21:05:07.004274 7f10de377700  0 log_channel(cluster) log [INF] : pgmap 6208 pgs: 12 unknown, 114 remapped+peering, 5 activating, 481 peering, 5596 active+clean; 261 TB data, 385 TB used, 225 T
B / 611 TB avail; 177 MB/s rd, 173 MB/s wr, 317 op/s
2018-08-21 21:05:07.025200 7f10d8bcd700  1 heartbeat_map reset_timeout 'Monitor::cpu_tp thread 0x7f10d8bcd700' had timed out after 0
2018-08-21 21:05:07.948138 7f10de377700  1 mon.clb-cph-frpar2-mon-01@0(leader).osd e114696 e114696: 168 total, 168 up, 168 in
2018-08-21 21:05:07.948487 7f10de377700  0 mon.clb-cph-frpar2-mon-01@0(leader).osd e114696 crush map has features 432365734501548032, adjusting msgr requires
2018-08-21 21:05:07.965671 7f10de377700  1 mon.clb-cph-frpar2-mon-01@0(leader).osd e114696 create_pending setting backfillfull_ratio = 0.9
2018-08-21 21:05:08.007585 7f10de377700  0 log_channel(cluster) log [DBG] : osdmap e114696: 168 total, 168 up, 168 in
2018-08-21 21:05:08.052153 7f10de377700  0 log_channel(cluster) log [INF] : pgmap 6208 pgs: 46 activating+remapped, 15 unknown, 305 remapped+peering, 11 activating, 697 peering, 8 active+remapped+backfil
ling, 5126 active+clean; 261 TB data, 385 TB used, 225 TB / 611 TB avail; 115 MB/s rd, 182 MB/s wr, 292 op/s; 26681/519327262 objects misplaced (0.005%); 4856 kB/s, 3 objects/s recovering

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