Any input from anyone, please? It's another thing that seems to be rather poorly documented: it's unclear what to expect, what 'normal' behavior should be, and what can be done about the huge amount of writes by monitors.
/Z On Mon, 9 Oct 2023 at 12:40, Zakhar Kirpichenko <zak...@gmail.com> wrote: > Hi, > > Monitors in our 16.2.14 cluster appear to quite often run "manual > compaction" tasks: > > debug 2023-10-09T09:30:53.888+0000 7f48a329a700 4 rocksdb: EVENT_LOG_v1 > {"time_micros": 1696843853892760, "job": 64225, "event": "flush_started", > "num_memtables": 1, "num_entries": 715, "num_deletes": 251, > "total_data_size": 3870352, "memory_usage": 3886744, "flush_reason": > "Manual Compaction"} > debug 2023-10-09T09:30:53.904+0000 7f4899286700 4 rocksdb: > [db_impl/db_impl_compaction_flush.cc:1443] [default] Manual compaction > starting > debug 2023-10-09T09:30:53.908+0000 7f48a3a9b700 4 rocksdb: (Original Log > Time 2023/10/09-09:30:53.910204) [db_impl/db_impl_compaction_flush.cc:2516] > [default] Manual compaction from level-0 to level-5 from 'paxos .. 'paxos; > will stop at (end) > debug 2023-10-09T09:30:53.908+0000 7f4899286700 4 rocksdb: > [db_impl/db_impl_compaction_flush.cc:1443] [default] Manual compaction > starting > debug 2023-10-09T09:30:53.908+0000 7f4899286700 4 rocksdb: > [db_impl/db_impl_compaction_flush.cc:1443] [default] Manual compaction > starting > debug 2023-10-09T09:30:53.908+0000 7f4899286700 4 rocksdb: > [db_impl/db_impl_compaction_flush.cc:1443] [default] Manual compaction > starting > debug 2023-10-09T09:30:53.908+0000 7f4899286700 4 rocksdb: > [db_impl/db_impl_compaction_flush.cc:1443] [default] Manual compaction > starting > debug 2023-10-09T09:30:53.908+0000 7f4899286700 4 rocksdb: > [db_impl/db_impl_compaction_flush.cc:1443] [default] Manual compaction > starting > debug 2023-10-09T09:30:53.908+0000 7f48a3a9b700 4 rocksdb: (Original Log > Time 2023/10/09-09:30:53.911004) [db_impl/db_impl_compaction_flush.cc:2516] > [default] Manual compaction from level-5 to level-6 from 'paxos .. 'paxos; > will stop at (end) > debug 2023-10-09T09:32:08.956+0000 7f48a329a700 4 rocksdb: EVENT_LOG_v1 > {"time_micros": 1696843928961390, "job": 64228, "event": "flush_started", > "num_memtables": 1, "num_entries": 1580, "num_deletes": 502, > "total_data_size": 8404605, "memory_usage": 8465840, "flush_reason": > "Manual Compaction"} > debug 2023-10-09T09:32:08.972+0000 7f4899286700 4 rocksdb: > [db_impl/db_impl_compaction_flush.cc:1443] [default] Manual compaction > starting > debug 2023-10-09T09:32:08.976+0000 7f48a3a9b700 4 rocksdb: (Original Log > Time 2023/10/09-09:32:08.977739) [db_impl/db_impl_compaction_flush.cc:2516] > [default] Manual compaction from level-0 to level-5 from 'logm .. 'logm; > will stop at (end) > debug 2023-10-09T09:32:08.976+0000 7f4899286700 4 rocksdb: > [db_impl/db_impl_compaction_flush.cc:1443] [default] Manual compaction > starting > debug 2023-10-09T09:32:08.976+0000 7f4899286700 4 rocksdb: > [db_impl/db_impl_compaction_flush.cc:1443] [default] Manual compaction > starting > debug 2023-10-09T09:32:08.976+0000 7f4899286700 4 rocksdb: > [db_impl/db_impl_compaction_flush.cc:1443] [default] Manual compaction > starting > debug 2023-10-09T09:32:08.976+0000 7f4899286700 4 rocksdb: > [db_impl/db_impl_compaction_flush.cc:1443] [default] Manual compaction > starting > debug 2023-10-09T09:32:08.976+0000 7f4899286700 4 rocksdb: > [db_impl/db_impl_compaction_flush.cc:1443] [default] Manual compaction > starting > debug 2023-10-09T09:32:08.976+0000 7f48a3a9b700 4 rocksdb: (Original Log > Time 2023/10/09-09:32:08.978512) [db_impl/db_impl_compaction_flush.cc:2516] > [default] Manual compaction from level-5 to level-6 from 'logm .. 'logm; > will stop at (end) > debug 2023-10-09T09:32:12.764+0000 7f4899286700 4 rocksdb: > [db_impl/db_impl_compaction_flush.cc:1443] [default] Manual compaction > starting > debug 2023-10-09T09:32:12.764+0000 7f4899286700 4 rocksdb: > [db_impl/db_impl_compaction_flush.cc:1443] [default] Manual compaction > starting > debug 2023-10-09T09:32:12.764+0000 7f4899286700 4 rocksdb: > [db_impl/db_impl_compaction_flush.cc:1443] [default] Manual compaction > starting > debug 2023-10-09T09:32:12.764+0000 7f4899286700 4 rocksdb: > [db_impl/db_impl_compaction_flush.cc:1443] [default] Manual compaction > starting > debug 2023-10-09T09:32:12.764+0000 7f4899286700 4 rocksdb: > [db_impl/db_impl_compaction_flush.cc:1443] [default] Manual compaction > starting > debug 2023-10-09T09:32:12.764+0000 7f4899286700 4 rocksdb: > [db_impl/db_impl_compaction_flush.cc:1443] [default] Manual compaction > starting > debug 2023-10-09T09:33:29.028+0000 7f48a329a700 4 rocksdb: EVENT_LOG_v1 > {"time_micros": 1696844009033151, "job": 64231, "event": "flush_started", > "num_memtables": 1, "num_entries": 1430, "num_deletes": 251, > "total_data_size": 8975535, "memory_usage": 9035920, "flush_reason": > "Manual Compaction"} > debug 2023-10-09T09:33:29.044+0000 7f4899286700 4 rocksdb: > [db_impl/db_impl_compaction_flush.cc:1443] [default] Manual compaction > starting > debug 2023-10-09T09:33:29.048+0000 7f48a3a9b700 4 rocksdb: (Original Log > Time 2023/10/09-09:33:29.049585) [db_impl/db_impl_compaction_flush.cc:2516] > [default] Manual compaction from level-0 to level-5 from 'paxos .. 'paxos; > will stop at (end) > debug 2023-10-09T09:33:29.048+0000 7f4899286700 4 rocksdb: > [db_impl/db_impl_compaction_flush.cc:1443] [default] Manual compaction > starting > debug 2023-10-09T09:33:29.048+0000 7f4899286700 4 rocksdb: > [db_impl/db_impl_compaction_flush.cc:1443] [default] Manual compaction > starting > debug 2023-10-09T09:33:29.048+0000 7f4899286700 4 rocksdb: > [db_impl/db_impl_compaction_flush.cc:1443] [default] Manual compaction > starting > debug 2023-10-09T09:33:29.048+0000 7f4899286700 4 rocksdb: > [db_impl/db_impl_compaction_flush.cc:1443] [default] Manual compaction > starting > debug 2023-10-09T09:33:29.048+0000 7f4899286700 4 rocksdb: > [db_impl/db_impl_compaction_flush.cc:1443] [default] Manual compaction > starting > debug 2023-10-09T09:33:29.048+0000 7f48a3a9b700 4 rocksdb: (Original Log > Time 2023/10/09-09:33:29.050355) [db_impl/db_impl_compaction_flush.cc:2516] > [default] Manual compaction from level-5 to level-6 from 'paxos .. 'paxos; > will stop at (end) > > I have removed a lot of interim log messages to save space. > > During each compaction the monitor process writes approximately 500-600 MB > of data to disk over a short period of time. These writes add up to tens of > gigabytes per hour and hundreds of gigabytes per day. > > Monitor rocksdb and compaction options are default: > > "mon_compact_on_bootstrap": "false", > "mon_compact_on_start": "false", > "mon_compact_on_trim": "true", > "mon_rocksdb_options": > "write_buffer_size=33554432,compression=kNoCompression,level_compaction_dynamic_level_bytes=true", > > Is this expected behavior? Is this something I can adjust in order to > extend the system storage life? > > Best regards, > Zakhar > _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-le...@ceph.io