New subject: [ceph-users] v13.2.7 mimic released

25 Nov 2019

This is the seventh bugfix release of the Mimic v13.2.x long term stable 
release series. We recommend all Mimic users upgrade.

For the full release notes, see

	https://ceph.io/releases/v13-2-7-mimic-released/

Notable Changes

MDS:

 - Cache trimming is now throttled. Dropping the MDS cache via the “ceph 
tell mds.<foo> cache drop” command or large reductions in the cache size 
will no longer cause service unavailability.
 - Behavior with recalling caps has been significantly improved to not 
attempt recalling too many caps at once, leading to instability. MDS with 
a large cache (64GB+) should be more stable.
 - MDS now provides a config option “mds_max_caps_per_client” (default: 
1M) to limit the number of caps a client session may hold. Long running 
client sessions with a large number of caps have been a source of 
instability in the MDS when all of these caps need to be processed during 
certain session events. It is recommended to not unnecessarily increase 
this value.
 - The “mds_recall_state_timeout” config parameter has been removed. Late 
client recall warnings are now generated based on the number of caps the 
MDS has recalled which have not been released. The new config parameters 
“mds_recall_warning_threshold” (default: 32K) and 
“mds_recall_warning_decay_rate” (default: 60s) set the threshold for this 
warning.
 - The “cache drop” admin socket command has been removed. The “ceph tell 
mds.X cache drop” remains.

OSD:

 - A health warning is now generated if the average osd heartbeat ping 
time exceeds a configurable threshold for any of the intervals computed. 
The OSD computes 1 minute, 5 minute and 15 minute intervals with average, 
minimum and maximum values. New configuration option 
“mon_warn_on_slow_ping_ratio” specifies a percentage of 
“osd_heartbeat_grace” to determine the threshold. A value of zero disables 
the warning. A new configuration option “mon_warn_on_slow_ping_time”, 
specified in milliseconds, overrides the computed value, causing a warning 
when OSD heartbeat pings take longer than the specified amount. A new 
admin command “ceph daemon mgr.# dump_osd_network [threshold]” lists all 
connections with a ping time longer than the specified threshold or value 
determined by the config options, for the average for any of the 3 
intervals. A new admin command ceph daemon osd.# dump_osd_network 
[threshold]” does the same but only including heartbeats initiated by the 
specified OSD.
 - The default value of the 
“osd_deep_scrub_large_omap_object_key_threshold” parameter has been 
lowered to detect an object with large number of omap keys more easily.

RGW:

- radosgw-admin introduces two subcommands that allow the managing of 
expire-stale objects that might be left behind after a bucket reshard in 
earlier versions of RGW. One subcommand lists such objects and the other 
deletes them. Read the troubleshooting section of the dynamic resharding 
docs for details.