Hi Brett,
Can you enable debug_bluestore = 5 and debug_prioritycache = 5 on one of
the OSDs that's showing the behavior? You'll want to look in the logs
for lines that look like this:
2019-07-18T19:34:42.587-0400 7f4048b8d700 5 prioritycache tune_memory
target: 4294967296 mapped: 4260962304 unmapped: 856948736 heap:
5117911040 old mem: 2845415707 new mem: 2845415707
2019-07-18T19:34:33.527-0400 7f4048b8d700 5
bluestore.MempoolThread(0x55a6d330ead0) _resize_shards cache_size:
2845415707 kv_alloc: 1241513984 kv_used: 874833889 meta_alloc:
1258291200 meta_used: 889040246 data_alloc: 318767104 data_used: 0
The first line will tell you what your memory target is set to, how much
memory is currently mapped, how much is unmapped (ie what's been freed
but the kernel hasn't reclaimed), the total heap size, and the old and
new aggregate size for all of bluestores caches. The second line also
tells you the aggregate cache size, and then how much space is being
allocated and used for the kv, meta, and data caches. If there's a leak
somewhere in the OSD or bluestore the autotuner will shrink the cache
way down but eventually won't be able to contain it and eventually your
process will start growing beyond the target size despite having a tiny
amount of bluestore cache. If it's something else like a huge amount of
freed memory not being reclaimed by the kernel, you'll see large amount
of unmapped memory and a big heap size despite the mapped memory staying
near the target. If it's a bug in the autotuner, we might see the
mapped memory greatly exceeding the target.
Mark
On 7/18/19 4:02 PM, Brett Kelly wrote:
Hello,
We have a Nautilus cluster exhibiting what looks like this bug:
https://tracker.ceph.com/issues/39618
No matter what is set as the osd_memory_target (currently 2147483648
), each OSD process will surpass this value and peak around ~4.0GB
then eventually start using swap. Cluster stays stable for about a
week and then starts running into OOM issues, kills off OSDs and
requires a reboot of each node to get back to a stable state.
Has anyone run into similar/workarounds ?
Ceph version: 14.2.1, RGW Clients
CentOS Linux release 7.6.1810 (Core)
Kernel: 3.10.0-957.12.1.el7.x86_64
256GB RAM per OSD node, 60 OSD's in each node.
Thanks,
--
Brett Kelly
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