Hi Tyler, To be honest we don't have anything set by ourselves regarding compaction and rocksdb: When I check the socket with ceph daemon on nvme and on ssd both have default false on compactL "mon_compact_on_start": "false" "osd_compact_on_start": "false",
Rocksdb also default: bluestore_rocksdb_options": "compression=kNoCompression,max_write_buffer_number=4,min_write_buffer_number_to_merge=1,recycle_log_file_num=4,write_buffer_size=268435456,writable_file_max_buffer_size=0,compaction_readahead_size=2097152,max_background_compactions=2,max_total_wal_size=1073741824" This is 1 event during the slow ops out of the 20: https://gist.githubusercontent.com/Badb0yBadb0y/30de736f5d2bd6ec48aa7acf0a3caa14/raw/1070acbf82cc8d69efc04e4e0583e7f83bd33b3f/gistfile1.txt All belongs to a bucket which doing streaming operation which means continuous delete and upload 24/7. I can see throttled options but still don't understand why the high latency. ty ________________________________ From: Tyler Stachecki <stachecki.ty...@gmail.com> Sent: Sunday, November 3, 2024 4:07 PM To: Szabo, Istvan (Agoda) <istvan.sz...@agoda.com> Cc: Ceph Users <ceph-users@ceph.io> Subject: Re: [ceph-users] Re: Slow ops during index pool recovery causes cluster performance drop to 1% Email received from the internet. If in doubt, don't click any link nor open any attachment ! ________________________________ On Sun, Nov 3, 2024 at 1:28 AM Szabo, Istvan (Agoda) <istvan.sz...@agoda.com> wrote: > Hi, > > I'm updating from octopus to quincy and all in our cluster when index pool > recovery kicks off, cluster operation drops to 1%, slow ops comes non-stop. > The recovery takes 1-2 hours/nodes. > > What I can see the iowait on the nvme drives which belongs to the index pool > is pretty high, however the throughput is less than 500MB/s, the iops is less > than 5000/sec. ... > after update and machine reboot compaction kicks off which generates 30-40 > iowait on the node, we prevent with "noup" flag to put these osds into the > cluster until compaction finished, however when we have 0 iowait after > compaction, I unset noup so recovery can start which causes the above issue. > If I wouldn't set noup it would cause even bigger issue. By any chance, are you specifying a value for bluestore_rocksdb_options in your ceph.conf? The compaction observation at reboot in particular is odd. Tyler ________________________________ This message is confidential and is for the sole use of the intended recipient(s). It may also be privileged or otherwise protected by copyright or other legal rules. If you have received it by mistake please let us know by reply email and delete it from your system. It is prohibited to copy this message or disclose its content to anyone. Any confidentiality or privilege is not waived or lost by any mistaken delivery or unauthorized disclosure of the message. All messages sent to and from Agoda may be monitored to ensure compliance with company policies, to protect the company's interests and to remove potential malware. Electronic messages may be intercepted, amended, lost or deleted, or contain viruses. _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-le...@ceph.io
