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[Maria-discuss] mysql_upgrade fails
by Majed Zouhairy 21 Apr '21

21 Apr '21

in last time's upgrade and today i got: sudo mysql_upgrade -u root -p Enter password: Phase 1/7: Checking and upgrading mysql database Processing databases mysql mysql.column_stats OK mysql.columns_priv OK mysql.db OK mysql.event OK mysql.func OK mysql.help_category OK mysql.help_keyword OK mysql.help_relation OK mysql.help_topic OK mysql.host OK mysql.index_stats OK mysql.plugin OK mysql.proc OK mysql.procs_priv OK mysql.proxies_priv OK mysql.roles_mapping OK mysql.servers OK mysql.table_stats OK mysql.tables_priv OK mysql.time_zone OK mysql.time_zone_leap_second OK mysql.time_zone_name OK mysql.time_zone_transition OK mysql.time_zone_transition_type OK mysql.user OK Phase 2/7: Installing used storage engines... Skipped Phase 3/7: Fixing views Phase 4/7: Running 'mysql_fix_privilege_tables' ERROR 1813 (HY000) at line 77: Tablespace for table '`mysql`.`innodb_table_stats`' exists. Please DISCARD the tablespace before IMPORT ERROR 1813 (HY000) at line 81: Tablespace for table '`mysql`.`innodb_index_stats`' exists. Please DISCARD the tablespace before IMPORT ERROR 1813 (HY000) at line 85: Tablespace for table '`mysql`.`transaction_registry`' exists. Please DISCARD the tablespace before IMPORT ERROR 1813 (HY000) at line 153: Tablespace for table '`mysql`.`gtid_slave_pos`' exists. Please DISCARD the tablespace before IMPORT ERROR 1146 (42S02) at line 642: Table 'mysql.innodb_index_stats' doesn't exist ERROR 1243 (HY000) at line 643: Unknown prepared statement handler (stmt) given to EXECUTE ERROR 1146 (42S02) at line 645: Table 'mysql.innodb_table_stats' doesn't exist ERROR 1243 (HY000) at line 646: Unknown prepared statement handler (stmt) given to EXECUTE ERROR 1146 (42S02) at line 650: Table 'mysql.innodb_index_stats' doesn't exist ERROR 1146 (42S02) at line 654: Table 'mysql.innodb_table_stats' doesn't exist ERROR 1146 (42S02) at line 657: Table 'mysql.innodb_table_stats' doesn't exist FATAL ERROR: Upgrade failed what to do?

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[Maria-discuss] SST's TLS in Galera prevents bootstrapping a new cluster
by lejeczek 12 Apr '21

12 Apr '21

Hi guys. It's pretty strange, in fact so strange that I presume I must be messing up something rather that MariaDB/Galera behaving this way by design. Thus before I paste any log snippets this question first: Why having this - [sst] tkey = /etc/my.cnf.d/certs/sst/sst.key tcert = /etc/my.cnf.d/certs/sst/sst.crt - would prevent a user to bootstrap new cluster? If do not use tkey/tcert I can bootstrap fine and after, cluster is up & running I put those back, then very next restart of mariadb on any/each node will work just fine. What is happening there some expert would mind to shed more light? many thanks, L.

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[Maria-discuss] Exceeding configured memory
by Sig Pam 12 Apr '21

12 Apr '21

Hi all! I run into problems with the memory configuration of MariaDB 10.3.27 on Debian 10. It looks as if it exceeds the configured memory. The server hat 4 GB of memory. It runs MariaDB and a Kopano (Mail/Collaboration) server. The configuration I believe I have made is 2GB for MariaDB, plus 1 GB for Kopano. The rest is for reserved for the OS. If I look at the process list, I can see that mysql greatly exceeds the configured 2GB limit: root@exchange64:~# ps -e -o "vsz rss pid comm" | grep mysql 4933304 1604212 852 mysqld The virtual process size is 4.9 GB, with 1.6 GB resident in RAM. I think this is the reason why the server heavily uses swap: root@exchange64:~# free total used free shared buff/cache available Mem: 4027240 2812284 117932 49712 1097024 875632 Swap: 4191228 1963464 2227764 <- 1.9 GB of swap in use The server runs only one database. The database itself consists only INNODB tables, with some of them being quite large: MariaDB [zarafa]> show table status; +-------------------+--------+---------+------------+---------+------------- ---+-------------+-----------------+--------------+-------------+----------- -----+---------------------+---------------------+------------+------------- -------+----------+-----------------------------------------+---------+----- -------------+-----------+ | Name | Engine | Version | Row_format | Rows | Avg_row_length | Data_length | Max_data_length | Index_length | Data_free | Auto_increment | Create_time | Update_time | Check_time | Collation | Checksum | Create_options | Comment | Max_index_length | Temporary | +-------------------+--------+---------+------------+---------+------------- ---+-------------+-----------------+--------------+-------------+----------- -----+---------------------+---------------------+------------+------------- -------+----------+-----------------------------------------+---------+----- -------------+-----------+ | abchanges | InnoDB | 10 | Compact | 223 | 293 | 65536 | 0 | 98304 | 13429112832 | 57841 | 2019-10-02 08:01:57 | NULL | NULL | utf8mb4_general_ci | NULL | | | 0 | N | | acl | InnoDB | 10 | Compact | 134 | 122 | 16384 | 0 | 0 | 13429112832 | NULL | 2019-10-02 08:01:57 | NULL | NULL | utf8mb4_general_ci | NULL | | | 0 | N | | changes | InnoDB | 10 | Compact | 3531055 | 136 | 483393536 | 0 | 693075968 | 13429112832 | 4601576 | 2019-10-02 08:06:06 | 2021-04-12 08:06:29 | NULL | utf8mb4_general_ci | NULL | | | 0 | N | | deferredupdate | InnoDB | 10 | Compact | 20038 | 116 | 2342912 | 0 | 442368 | 13429112832 | NULL | 2019-10-02 08:06:06 | 2021-04-12 08:06:29 | NULL | utf8mb4_general_ci | NULL | | | 0 | N | | hierarchy | InnoDB | 10 | Compact | 348880 | 61 | 21495808 | 0 | 12976128 | 13429112832 | 2361351 | 2019-10-02 08:06:07 | 2021-04-12 08:06:29 | NULL | utf8mb4_general_ci | NULL | | | 0 | N | | indexedproperties | InnoDB | 10 | Compact | 259399 | 103 | 26787840 | 0 | 25640960 | 13429112832 | NULL | 2019-10-02 08:06:10 | 2021-04-12 08:06:29 | NULL | utf8mb4_general_ci | NULL | | | 0 | N | | lob | InnoDB | 10 | Compact | 130069 | 175090 | 22773825536 | 0 | 0 | 13429112832 | NULL | 2019-10-02 08:08:59 | 2021-04-12 08:05:53 | NULL | utf8mb4_general_ci | NULL | max_rows=1000000000 avg_row_length=1750 | | 0 | N | | mvproperties | InnoDB | 10 | Compact | 9703 | 158 | 1540096 | 0 | 0 | 13429112832 | NULL | 2019-10-02 08:08:59 | 2021-04-12 06:58:44 | NULL | utf8mb4_general_ci | NULL | | | 0 | N | | names | InnoDB | 10 | Compact | 3283 | 69 | 229376 | 0 | 671744 | 13429112832 | 3294 | 2019-10-02 08:08:59 | NULL | NULL | utf8mb4_general_ci | NULL | | | 0 | N | | object | InnoDB | 10 | Compact | 6 | 2730 | 16384 | 0 | 32768 | 13429112832 | 7 | 2019-10-02 08:08:59 | NULL | NULL | utf8mb4_general_ci | NULL | | | 0 | N | | objectmvproperty | InnoDB | 10 | Compact | 0 | 0 | 16384 | 0 | 0 | 13429112832 | NULL | 2019-10-02 08:08:59 | NULL | NULL | utf8mb4_general_ci | NULL | | | 0 | N | | objectproperty | InnoDB | 10 | Compact | 40 | 409 | 16384 | 0 | 0 | 13429112832 | NULL | 2019-10-02 08:08:59 | NULL | NULL | utf8mb4_general_ci | NULL | | | 0 | N | | objectrelation | InnoDB | 10 | Compact | 3 | 5461 | 16384 | 0 | 0 | 13429112832 | NULL | 2019-10-02 08:08:59 | NULL | NULL | utf8mb4_general_ci | NULL | | | 0 | N | | outgoingqueue | InnoDB | 10 | Compact | 0 | 0 | 16384 | 0 | 0 | 13429112832 | NULL | 2019-10-02 08:08:59 | 2021-04-12 07:20:40 | NULL | utf8mb4_general_ci | NULL | | | 0 | N | | properties | InnoDB | 10 | Compact | 9895527 | 414 | 4104863744 | 0 | 0 | 13429112832 | NULL | 2019-10-02 08:12:52 | 2021-04-12 08:18:25 | NULL | utf8mb4_general_ci | NULL | | | 0 | N | | receivefolder | InnoDB | 10 | Compact | 60 | 273 | 16384 | 0 | 16384 | 13429112832 | 209 | 2019-02-06 17:01:07 | NULL | NULL | utf8mb4_general_ci | NULL | | | 0 | N | | searchresults | InnoDB | 10 | Compact | 7404 | 161 | 1196032 | 0 | 0 | 13429112832 | NULL | 2019-02-06 17:01:08 | 2021-04-12 06:58:46 | NULL | utf8mb4_general_ci | NULL | | | 0 | N | | settings | InnoDB | 10 | Compact | 6 | 2730 | 16384 | 0 | 0 | 13429112832 | NULL | 2019-02-06 17:07:00 | 2021-04-12 08:05:53 | NULL | utf8mb4_general_ci | NULL | | | 0 | N | | singleinstances | InnoDB | 10 | Compact | 93075 | 70 | 6553600 | 0 | 4472832 | 13429112832 | 789962 | 2019-02-06 17:01:09 | 2021-04-12 08:05:53 | NULL | utf8mb4_general_ci | NULL | | | 0 | N | | stores | InnoDB | 10 | Compact | 16 | 1024 | 16384 | 0 | 16384 | 13429112832 | 55 | 2019-02-06 17:01:09 | NULL | NULL | utf8mb4_general_ci | NULL | | | 0 | N | | syncedmessages | InnoDB | 10 | Compact | 31098 | 135 | 4210688 | 0 | 2113536 | 13429112832 | NULL | 2019-02-06 17:01:09 | 2021-04-12 08:08:07 | NULL | utf8mb4_general_ci | NULL | | | 0 | N | | syncs | InnoDB | 10 | Compact | 30813 | 85 | 2621440 | 0 | 5750784 | 13429112832 | 255042 | 2019-02-06 17:01:10 | 2021-04-12 08:18:24 | NULL | utf8mb4_general_ci | NULL | | | 0 | N | | tproperties | InnoDB | 10 | Compact | 8528065 | 103 | 881278976 | 0 | 319373312 | 13429112832 | NULL | 2019-02-06 17:06:59 | 2021-04-12 08:06:29 | NULL | utf8mb4_general_ci | NULL | | | 0 | N | | usergroup_acl | InnoDB | 10 | Compact | 2 | 8192 | 16384 | 0 | 0 | 13429112832 | NULL | 2018-11-08 18:13:26 | NULL | NULL | latin1_swedish_ci | NULL | | | 0 | N | | users | InnoDB | 10 | Compact | 24 | 682 | 16384 | 0 | 16384 | 13429112832 | 86 | 2019-02-06 17:06:59 | NULL | NULL | utf8mb4_general_ci | NULL | | | 0 | N | | versions | InnoDB | 10 | Compact | 88 | 186 | 16384 | 0 | 0 | 13429112832 | NULL | 2019-02-06 17:06:59 | NULL | NULL | utf8mb4_general_ci | NULL | | | 0 | N | +-------------------+--------+---------+------------+---------+------------- ---+-------------+-----------------+--------------+-------------+----------- -----+---------------------+---------------------+------------+------------- -------+----------+-----------------------------------------+---------+----- -------------+-----------+ 26 rows in set (0.490 sec) These are the innodb variables: MariaDB [zarafa]> show variables like 'innodb%'; +---------------------------------------------+------------------------+ | Variable_name | Value | +---------------------------------------------+------------------------+ | innodb_adaptive_flushing | ON | | innodb_adaptive_flushing_lwm | 10.000000 | | innodb_adaptive_hash_index | ON | | innodb_adaptive_hash_index_parts | 8 | | innodb_adaptive_max_sleep_delay | 150000 | | innodb_autoextend_increment | 64 | | innodb_autoinc_lock_mode | 1 | | innodb_background_scrub_data_check_interval | 3600 | | innodb_background_scrub_data_compressed | OFF | | innodb_background_scrub_data_interval | 604800 | | innodb_background_scrub_data_uncompressed | OFF | | innodb_buf_dump_status_frequency | 0 | | innodb_buffer_pool_chunk_size | 134217728 | | innodb_buffer_pool_dump_at_shutdown | ON | | innodb_buffer_pool_dump_now | OFF | | innodb_buffer_pool_dump_pct | 25 | | innodb_buffer_pool_filename | ib_buffer_pool | | innodb_buffer_pool_instances | 8 | | innodb_buffer_pool_load_abort | OFF | | innodb_buffer_pool_load_at_startup | ON | | innodb_buffer_pool_load_now | OFF | | innodb_buffer_pool_size | 2147483648 | | innodb_change_buffer_max_size | 25 | | innodb_change_buffering | all | | innodb_checksum_algorithm | crc32 | | innodb_checksums | ON | | innodb_cmp_per_index_enabled | OFF | | innodb_commit_concurrency | 0 | | innodb_compression_algorithm | zlib | | innodb_compression_default | OFF | | innodb_compression_failure_threshold_pct | 5 | | innodb_compression_level | 6 | | innodb_compression_pad_pct_max | 50 | | innodb_concurrency_tickets | 5000 | | innodb_data_file_path | ibdata1:12M:autoextend | | innodb_data_home_dir | | | innodb_deadlock_detect | ON | | innodb_default_encryption_key_id | 1 | | innodb_default_row_format | dynamic | | innodb_defragment | OFF | | innodb_defragment_fill_factor | 0.900000 | | innodb_defragment_fill_factor_n_recs | 20 | | innodb_defragment_frequency | 40 | | innodb_defragment_n_pages | 7 | | innodb_defragment_stats_accuracy | 0 | | innodb_disable_sort_file_cache | OFF | | innodb_disallow_writes | OFF | | innodb_doublewrite | ON | | innodb_encrypt_log | OFF | | innodb_encrypt_tables | OFF | | innodb_encrypt_temporary_tables | OFF | | innodb_encryption_rotate_key_age | 1 | | innodb_encryption_rotation_iops | 100 | | innodb_encryption_threads | 0 | | innodb_fast_shutdown | 1 | | innodb_fatal_semaphore_wait_threshold | 600 | | innodb_file_format | | | innodb_file_per_table | ON | | innodb_fill_factor | 100 | | innodb_flush_log_at_timeout | 1 | | innodb_flush_log_at_trx_commit | 1 | | innodb_flush_method | fsync | | innodb_flush_neighbors | 1 | | innodb_flush_sync | ON | | innodb_flushing_avg_loops | 30 | | innodb_force_load_corrupted | OFF | | innodb_force_primary_key | OFF | | innodb_force_recovery | 0 | | innodb_ft_aux_table | | | innodb_ft_cache_size | 8000000 | | innodb_ft_enable_diag_print | OFF | | innodb_ft_enable_stopword | ON | | innodb_ft_max_token_size | 84 | | innodb_ft_min_token_size | 3 | | innodb_ft_num_word_optimize | 2000 | | innodb_ft_result_cache_limit | 2000000000 | | innodb_ft_server_stopword_table | | | innodb_ft_sort_pll_degree | 2 | | innodb_ft_total_cache_size | 640000000 | | innodb_ft_user_stopword_table | | | innodb_idle_flush_pct | 100 | | innodb_immediate_scrub_data_uncompressed | OFF | | innodb_instant_alter_column_allowed | add_last | | innodb_io_capacity | 200 | | innodb_io_capacity_max | 2000 | | innodb_large_prefix | | | innodb_lock_schedule_algorithm | fcfs | | innodb_lock_wait_timeout | 50 | | innodb_locks_unsafe_for_binlog | OFF | | innodb_log_buffer_size | 33554432 | | innodb_log_checksums | ON | | innodb_log_compressed_pages | ON | | innodb_log_file_size | 536870912 | | innodb_log_files_in_group | 2 | | innodb_log_group_home_dir | ./ | | innodb_log_optimize_ddl | OFF | | innodb_log_write_ahead_size | 8192 | | innodb_lru_scan_depth | 1024 | | innodb_max_dirty_pages_pct | 75.000000 | | innodb_max_dirty_pages_pct_lwm | 0.000000 | | innodb_max_purge_lag | 0 | | innodb_max_purge_lag_delay | 0 | | innodb_max_purge_lag_wait | 4294967295 | | innodb_max_undo_log_size | 10485760 | | innodb_monitor_disable | | | innodb_monitor_enable | | | innodb_monitor_reset | | | innodb_monitor_reset_all | | | innodb_old_blocks_pct | 37 | | innodb_old_blocks_time | 1000 | | innodb_online_alter_log_max_size | 134217728 | | innodb_open_files | 1000 | | innodb_optimize_fulltext_only | OFF | | innodb_page_cleaners | 4 | | innodb_page_size | 16384 | | innodb_prefix_index_cluster_optimization | OFF | | innodb_print_all_deadlocks | OFF | | innodb_purge_batch_size | 300 | | innodb_purge_rseg_truncate_frequency | 128 | | innodb_purge_threads | 4 | | innodb_random_read_ahead | OFF | | innodb_read_ahead_threshold | 56 | | innodb_read_io_threads | 4 | | innodb_read_only | OFF | | innodb_replication_delay | 0 | | innodb_rollback_on_timeout | OFF | | innodb_rollback_segments | 128 | | innodb_scrub_log | OFF | | innodb_scrub_log_speed | 256 | | innodb_sort_buffer_size | 1048576 | | innodb_spin_wait_delay | 4 | | innodb_stats_auto_recalc | ON | | innodb_stats_include_delete_marked | OFF | | innodb_stats_method | nulls_equal | | innodb_stats_modified_counter | 0 | | innodb_stats_on_metadata | OFF | | innodb_stats_persistent | ON | | innodb_stats_persistent_sample_pages | 20 | | innodb_stats_sample_pages | 8 | | innodb_stats_traditional | ON | | innodb_stats_transient_sample_pages | 8 | | innodb_status_output | OFF | | innodb_status_output_locks | OFF | | innodb_strict_mode | ON | | innodb_sync_array_size | 1 | | innodb_sync_spin_loops | 30 | | innodb_table_locks | ON | | innodb_temp_data_file_path | ibtmp1:12M:autoextend | | innodb_thread_concurrency | 0 | | innodb_thread_sleep_delay | 10000 | | innodb_tmpdir | | | innodb_undo_directory | ./ | | innodb_undo_log_truncate | OFF | | innodb_undo_logs | 128 | | innodb_undo_tablespaces | 0 | | innodb_use_atomic_writes | ON | | innodb_use_native_aio | ON | | innodb_version | 10.3.27 | | innodb_write_io_threads | 4 | +---------------------------------------------+------------------------+ 159 rows in set (0.217 sec) And for completeness, all variables (sorry, it's long and looks ugly): root@exchange64:/etc/mysql/conf.d# <mailto:root@exchange64:/etc/mysql/conf.d#> echo "show variables;" | mysql zarafa Variable_name Value alter_algorithm DEFAULT aria_block_size 8192 aria_checkpoint_interval 30 aria_checkpoint_log_activity 1048576 aria_encrypt_tables OFF aria_force_start_after_recovery_failures 0 aria_group_commit none aria_group_commit_interval 0 aria_log_file_size 1073741824 aria_log_purge_type immediate aria_max_sort_file_size 9223372036853727232 aria_page_checksum ON aria_pagecache_age_threshold 300 aria_pagecache_buffer_size 134217728 aria_pagecache_division_limit 100 aria_pagecache_file_hash_size 512 aria_recover_options BACKUP,QUICK aria_repair_threads 1 aria_sort_buffer_size 268434432 aria_stats_method nulls_unequal aria_sync_log_dir NEWFILE aria_used_for_temp_tables ON auto_increment_increment 1 auto_increment_offset 1 autocommit ON automatic_sp_privileges ON back_log 80 basedir /usr big_tables OFF bind_address 127.0.0.1 binlog_annotate_row_events ON binlog_cache_size 32768 binlog_checksum CRC32 binlog_commit_wait_count 0 binlog_commit_wait_usec 100000 binlog_direct_non_transactional_updates OFF binlog_file_cache_size 16384 binlog_format MIXED binlog_optimize_thread_scheduling ON binlog_row_image FULL binlog_stmt_cache_size 32768 bulk_insert_buffer_size 8388608 character_set_client utf8mb4 character_set_connection utf8mb4 character_set_database latin1 character_set_filesystem binary character_set_results utf8mb4 character_set_server utf8mb4 character_set_system utf8 character_sets_dir /usr/share/mysql/charsets/ check_constraint_checks ON collation_connection utf8mb4_general_ci collation_database latin1_swedish_ci collation_server utf8mb4_general_ci column_compression_threshold 100 column_compression_zlib_level 6 column_compression_zlib_strategy DEFAULT_STRATEGY column_compression_zlib_wrap OFF completion_type NO_CHAIN concurrent_insert AUTO connect_timeout 10 core_file OFF datadir /var/lib/mysql/ date_format %Y-%m-%d datetime_format %Y-%m-%d %H:%i:%s deadlock_search_depth_long 15 deadlock_search_depth_short 4 deadlock_timeout_long 50000000 deadlock_timeout_short 10000 debug_no_thread_alarm OFF default_master_connection default_regex_flags default_storage_engine InnoDB default_tmp_storage_engine default_week_format 0 delay_key_write ON delayed_insert_limit 100 delayed_insert_timeout 300 delayed_queue_size 1000 div_precision_increment 4 encrypt_binlog OFF encrypt_tmp_disk_tables OFF encrypt_tmp_files OFF enforce_storage_engine eq_range_index_dive_limit 0 error_count 0 event_scheduler OFF expensive_subquery_limit 100 expire_logs_days 10 explicit_defaults_for_timestamp OFF external_user extra_max_connections 1 extra_port 0 flush OFF flush_time 0 foreign_key_checks ON ft_boolean_syntax + -><()~*:""&| ft_max_word_len 84 ft_min_word_len 4 ft_query_expansion_limit 20 ft_stopword_file (built-in) general_log OFF general_log_file exchange64.log group_concat_max_len 1048576 gtid_binlog_pos gtid_binlog_state gtid_current_pos gtid_domain_id 0 gtid_ignore_duplicates OFF gtid_pos_auto_engines gtid_seq_no 0 gtid_slave_pos gtid_strict_mode OFF have_compress YES have_crypt YES have_dynamic_loading YES have_geometry YES have_openssl NO have_profiling YES have_query_cache YES have_rtree_keys YES have_ssl DISABLED have_symlink YES histogram_size 0 histogram_type SINGLE_PREC_HB host_cache_size 279 hostname exchange64 identity 0 idle_readonly_transaction_timeout 0 idle_transaction_timeout 0 idle_write_transaction_timeout 0 ignore_builtin_innodb OFF ignore_db_dirs in_predicate_conversion_threshold 1000 in_transaction 0 init_connect init_file init_slave innodb_adaptive_flushing ON innodb_adaptive_flushing_lwm 10.000000 innodb_adaptive_hash_index ON innodb_adaptive_hash_index_parts 8 innodb_adaptive_max_sleep_delay 150000 innodb_autoextend_increment 64 innodb_autoinc_lock_mode 1 innodb_background_scrub_data_check_interval 3600 innodb_background_scrub_data_compressed OFF innodb_background_scrub_data_interval 604800 innodb_background_scrub_data_uncompressed OFF innodb_buf_dump_status_frequency 0 innodb_buffer_pool_chunk_size 134217728 innodb_buffer_pool_dump_at_shutdown ON innodb_buffer_pool_dump_now OFF innodb_buffer_pool_dump_pct 25 innodb_buffer_pool_filename ib_buffer_pool innodb_buffer_pool_instances 8 innodb_buffer_pool_load_abort OFF innodb_buffer_pool_load_at_startup ON innodb_buffer_pool_load_now OFF innodb_buffer_pool_size 2147483648 innodb_change_buffer_max_size 25 innodb_change_buffering all innodb_checksum_algorithm crc32 innodb_checksums ON innodb_cmp_per_index_enabled OFF innodb_commit_concurrency 0 innodb_compression_algorithm zlib innodb_compression_default OFF innodb_compression_failure_threshold_pct 5 innodb_compression_level 6 innodb_compression_pad_pct_max 50 innodb_concurrency_tickets 5000 innodb_data_file_path ibdata1:12M:autoextend innodb_data_home_dir innodb_deadlock_detect ON innodb_default_encryption_key_id 1 innodb_default_row_format dynamic innodb_defragment OFF innodb_defragment_fill_factor 0.900000 innodb_defragment_fill_factor_n_recs 20 innodb_defragment_frequency 40 innodb_defragment_n_pages 7 innodb_defragment_stats_accuracy 0 innodb_disable_sort_file_cache OFF innodb_disallow_writes OFF innodb_doublewrite ON innodb_encrypt_log OFF innodb_encrypt_tables OFF innodb_encrypt_temporary_tables OFF innodb_encryption_rotate_key_age 1 innodb_encryption_rotation_iops 100 innodb_encryption_threads 0 innodb_fast_shutdown 1 innodb_fatal_semaphore_wait_threshold 600 innodb_file_format innodb_file_per_table ON innodb_fill_factor 100 innodb_flush_log_at_timeout 1 innodb_flush_log_at_trx_commit 1 innodb_flush_method fsync innodb_flush_neighbors 1 innodb_flush_sync ON innodb_flushing_avg_loops 30 innodb_force_load_corrupted OFF innodb_force_primary_key OFF innodb_force_recovery 0 innodb_ft_aux_table innodb_ft_cache_size 8000000 innodb_ft_enable_diag_print OFF innodb_ft_enable_stopword ON innodb_ft_max_token_size 84 innodb_ft_min_token_size 3 innodb_ft_num_word_optimize 2000 innodb_ft_result_cache_limit 2000000000 innodb_ft_server_stopword_table innodb_ft_sort_pll_degree 2 innodb_ft_total_cache_size 640000000 innodb_ft_user_stopword_table innodb_idle_flush_pct 100 innodb_immediate_scrub_data_uncompressed OFF innodb_instant_alter_column_allowed add_last innodb_io_capacity 200 innodb_io_capacity_max 2000 innodb_large_prefix innodb_lock_schedule_algorithm fcfs innodb_lock_wait_timeout 50 innodb_locks_unsafe_for_binlog OFF innodb_log_buffer_size 33554432 innodb_log_checksums ON innodb_log_compressed_pages ON innodb_log_file_size 536870912 innodb_log_files_in_group 2 innodb_log_group_home_dir ./ innodb_log_optimize_ddl OFF innodb_log_write_ahead_size 8192 innodb_lru_scan_depth 1024 innodb_max_dirty_pages_pct 75.000000 innodb_max_dirty_pages_pct_lwm 0.000000 innodb_max_purge_lag 0 innodb_max_purge_lag_delay 0 innodb_max_purge_lag_wait 4294967295 innodb_max_undo_log_size 10485760 innodb_monitor_disable innodb_monitor_enable innodb_monitor_reset innodb_monitor_reset_all innodb_old_blocks_pct 37 innodb_old_blocks_time 1000 innodb_online_alter_log_max_size 134217728 innodb_open_files 1000 innodb_optimize_fulltext_only OFF innodb_page_cleaners 4 innodb_page_size 16384 innodb_prefix_index_cluster_optimization OFF innodb_print_all_deadlocks OFF innodb_purge_batch_size 300 innodb_purge_rseg_truncate_frequency 128 innodb_purge_threads 4 innodb_random_read_ahead OFF innodb_read_ahead_threshold 56 innodb_read_io_threads 4 innodb_read_only OFF innodb_replication_delay 0 innodb_rollback_on_timeout OFF innodb_rollback_segments 128 innodb_scrub_log OFF innodb_scrub_log_speed 256 innodb_sort_buffer_size 1048576 innodb_spin_wait_delay 4 innodb_stats_auto_recalc ON innodb_stats_include_delete_marked OFF innodb_stats_method nulls_equal innodb_stats_modified_counter 0 innodb_stats_on_metadata OFF innodb_stats_persistent ON innodb_stats_persistent_sample_pages 20 innodb_stats_sample_pages 8 innodb_stats_traditional ON innodb_stats_transient_sample_pages 8 innodb_status_output OFF innodb_status_output_locks OFF innodb_strict_mode ON innodb_sync_array_size 1 innodb_sync_spin_loops 30 innodb_table_locks ON innodb_temp_data_file_path ibtmp1:12M:autoextend innodb_thread_concurrency 0 innodb_thread_sleep_delay 10000 innodb_tmpdir innodb_undo_directory ./ innodb_undo_log_truncate OFF innodb_undo_logs 128 innodb_undo_tablespaces 0 innodb_use_atomic_writes ON innodb_use_native_aio ON innodb_version 10.3.27 innodb_write_io_threads 4 insert_id 0 interactive_timeout 28800 join_buffer_size 262144 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log_slow_verbosity log_tc_size 24576 log_warnings 2 long_query_time 10.000000 low_priority_updates OFF lower_case_file_system OFF lower_case_table_names 0 master_verify_checksum OFF max_allowed_packet 16777216 max_binlog_cache_size 18446744073709547520 max_binlog_size 1073741824 max_binlog_stmt_cache_size 18446744073709547520 max_connect_errors 100 max_connections 151 max_delayed_threads 20 max_digest_length 1024 max_error_count 64 max_heap_table_size 16777216 max_insert_delayed_threads 20 max_join_size 18446744073709551615 max_length_for_sort_data 1024 max_long_data_size 16777216 max_prepared_stmt_count 16382 max_recursive_iterations 4294967295 max_relay_log_size 1073741824 max_seeks_for_key 4294967295 max_session_mem_used 9223372036854775807 max_sort_length 1024 max_sp_recursion_depth 0 max_statement_time 0.000000 max_tmp_tables 32 max_user_connections 0 max_write_lock_count 4294967295 metadata_locks_cache_size 1024 metadata_locks_hash_instances 8 min_examined_row_limit 0 mrr_buffer_size 262144 multi_range_count 256 myisam_block_size 1024 myisam_data_pointer_size 6 myisam_max_sort_file_size 9223372036853727232 myisam_mmap_size 18446744073709551615 myisam_recover_options BACKUP,QUICK myisam_repair_threads 1 myisam_sort_buffer_size 134216704 myisam_stats_method NULLS_UNEQUAL myisam_use_mmap OFF mysql56_temporal_format ON net_buffer_length 16384 net_read_timeout 30 net_retry_count 10 net_write_timeout 60 old OFF old_alter_table DEFAULT old_mode old_passwords OFF open_files_limit 16186 optimizer_prune_level 1 optimizer_search_depth 62 optimizer_selectivity_sampling_limit 100 optimizer_switch index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_in tersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=of f,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmat ch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_ma tch_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr _cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cac he=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optim ize_join_buffer_size=off,table_elimination=on,extended_keys=on,exists_to_in= on,orderby_uses_equalities=on,condition_pushdown_for_derived=on,split_materi alized=on optimizer_use_condition_selectivity 1 performance_schema OFF performance_schema_accounts_size -1 performance_schema_digests_size -1 performance_schema_events_stages_history_long_size -1 performance_schema_events_stages_history_size -1 performance_schema_events_statements_history_long_size -1 performance_schema_events_statements_history_size -1 performance_schema_events_waits_history_long_size -1 performance_schema_events_waits_history_size -1 performance_schema_hosts_size -1 performance_schema_max_cond_classes 80 performance_schema_max_cond_instances -1 performance_schema_max_digest_length 1024 performance_schema_max_file_classes 50 performance_schema_max_file_handles 32768 performance_schema_max_file_instances -1 performance_schema_max_mutex_classes 200 performance_schema_max_mutex_instances -1 performance_schema_max_rwlock_classes 40 performance_schema_max_rwlock_instances -1 performance_schema_max_socket_classes 10 performance_schema_max_socket_instances -1 performance_schema_max_stage_classes 160 performance_schema_max_statement_classes 200 performance_schema_max_table_handles -1 performance_schema_max_table_instances -1 performance_schema_max_thread_classes 50 performance_schema_max_thread_instances -1 performance_schema_session_connect_attrs_size -1 performance_schema_setup_actors_size 100 performance_schema_setup_objects_size 100 performance_schema_users_size -1 pid_file /run/mysqld/mysqld.pid plugin_dir /usr/lib/x86_64-linux-gnu/mariadb19/plugin/ plugin_maturity gamma port 3306 preload_buffer_size 32768 profiling OFF profiling_history_size 15 progress_report_time 5 protocol_version 10 proxy_protocol_networks proxy_user pseudo_slave_mode OFF pseudo_thread_id 10804 query_alloc_block_size 16384 query_cache_limit 1048576 query_cache_min_res_unit 4096 query_cache_size 16777216 query_cache_strip_comments OFF query_cache_type ON query_cache_wlock_invalidate OFF query_prealloc_size 24576 rand_seed1 27429069 rand_seed2 533006049 range_alloc_block_size 4096 read_binlog_speed_limit 0 read_buffer_size 131072 read_only OFF read_rnd_buffer_size 262144 relay_log relay_log_basename relay_log_index relay_log_info_file relay-log.info relay_log_purge ON relay_log_recovery OFF relay_log_space_limit 0 replicate_annotate_row_events ON replicate_do_db replicate_do_table replicate_events_marked_for_skip REPLICATE replicate_ignore_db replicate_ignore_table replicate_wild_do_table replicate_wild_ignore_table report_host report_password report_port 3306 report_user rowid_merge_buff_size 8388608 rpl_semi_sync_master_enabled OFF rpl_semi_sync_master_timeout 10000 rpl_semi_sync_master_trace_level 32 rpl_semi_sync_master_wait_no_slave ON rpl_semi_sync_master_wait_point AFTER_COMMIT rpl_semi_sync_slave_delay_master OFF rpl_semi_sync_slave_enabled OFF rpl_semi_sync_slave_kill_conn_timeout 5 rpl_semi_sync_slave_trace_level 32 secure_auth ON secure_file_priv secure_timestamp NO server_id 1 session_track_schema ON session_track_state_change OFF session_track_system_variables autocommit,character_set_client,character_set_connection,character_set_resul ts,time_zone session_track_transaction_info OFF skip_external_locking ON skip_name_resolve OFF skip_networking OFF skip_parallel_replication OFF skip_replication OFF skip_show_database OFF slave_compressed_protocol OFF slave_ddl_exec_mode IDEMPOTENT slave_domain_parallel_threads 0 slave_exec_mode STRICT slave_load_tmpdir /tmp slave_max_allowed_packet 1073741824 slave_net_timeout 60 slave_parallel_max_queued 131072 slave_parallel_mode conservative slave_parallel_threads 0 slave_parallel_workers 0 slave_run_triggers_for_rbr NO slave_skip_errors OFF slave_sql_verify_checksum ON slave_transaction_retries 10 slave_transaction_retry_errors 1213,1205 slave_transaction_retry_interval 0 slave_type_conversions slow_launch_time 2 slow_query_log OFF slow_query_log_file exchange64-slow.log socket /run/mysqld/mysqld.sock sort_buffer_size 2097152 sql_auto_is_null OFF sql_big_selects ON sql_buffer_result OFF sql_log_bin ON sql_log_off OFF sql_mode STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE _SUBSTITUTION sql_notes ON sql_quote_show_create ON sql_safe_updates OFF sql_select_limit 18446744073709551615 sql_slave_skip_counter 0 sql_warnings OFF ssl_ca ssl_capath ssl_cert ssl_cipher ssl_crl ssl_crlpath ssl_key standard_compliant_cte ON storage_engine InnoDB stored_program_cache 256 strict_password_validation ON sync_binlog 0 sync_frm ON sync_master_info 10000 sync_relay_log 10000 sync_relay_log_info 10000 system_time_zone CEST system_versioning_alter_history ERROR system_versioning_asof DEFAULT table_definition_cache 400 table_open_cache 1000 table_open_cache_instances 8 tcp_keepalive_interval 0 tcp_keepalive_probes 0 tcp_keepalive_time 0 thread_cache_size 151 thread_concurrency 10 thread_handling one-thread-per-connection thread_pool_idle_timeout 60 thread_pool_max_threads 65536 thread_pool_oversubscribe 3 thread_pool_prio_kickup_timer 1000 thread_pool_priority auto thread_pool_size 4 thread_pool_stall_limit 500 thread_stack 299008 time_format %H:%i:%s time_zone SYSTEM timed_mutexes OFF timestamp 1618208688.935216 tmp_disk_table_size 18446744073709551615 tmp_memory_table_size 16777216 tmp_table_size 16777216 tmpdir /tmp transaction_alloc_block_size 8192 transaction_prealloc_size 4096 tx_isolation REPEATABLE-READ tx_read_only OFF unique_checks ON updatable_views_with_limit YES use_stat_tables NEVER userstat OFF version 10.3.27-MariaDB-0+deb10u1 version_comment Debian 10 version_compile_machine x86_64 version_compile_os debian-linux-gnu version_malloc_library system version_source_revision dba846ce2a4c57363c4f0256b0e6d2dd1a55ac40 version_ssl_library YaSSL 2.4.4 wait_timeout 28800 warning_count 0 wsrep_osu_method TOI wsrep_auto_increment_control ON wsrep_causal_reads OFF wsrep_certification_rules strict wsrep_certify_nonpk ON wsrep_cluster_address wsrep_cluster_name my_wsrep_cluster wsrep_convert_lock_to_trx OFF wsrep_data_home_dir /var/lib/mysql/ wsrep_dbug_option wsrep_debug OFF wsrep_desync OFF wsrep_dirty_reads OFF wsrep_drupal_282555_workaround OFF wsrep_forced_binlog_format NONE wsrep_gtid_domain_id 0 wsrep_gtid_mode OFF wsrep_load_data_splitting ON wsrep_log_conflicts OFF wsrep_max_ws_rows 0 wsrep_max_ws_size 2147483647 wsrep_mysql_replication_bundle 0 wsrep_node_address wsrep_node_incoming_address AUTO wsrep_node_name exchange64 wsrep_notify_cmd wsrep_on OFF wsrep_patch_version wsrep_25.24 wsrep_provider none wsrep_provider_options wsrep_recover OFF wsrep_reject_queries NONE wsrep_replicate_myisam OFF wsrep_restart_slave OFF wsrep_retry_autocommit 1 wsrep_slave_fk_checks ON wsrep_slave_uk_checks OFF wsrep_slave_threads 1 wsrep_sst_auth wsrep_sst_donor wsrep_sst_donor_rejects_queries OFF wsrep_sst_method rsync wsrep_sst_receive_address AUTO wsrep_start_position 00000000-0000-0000-0000-000000000000:-1 wsrep_sync_wait 0 Can somebody please give me an advice what I made wrong to limit the memory usage of MariaDB to 2 GB? Thank you very much! Sig

2 1

[Maria-discuss] MEMORY tables and binlog
by Dajka Tamás 07 Apr '21

07 Apr '21

Hi All, I'm facing a weird error. We're migrating our old 10.1 multi-master setup to a new 10.3 cluster (everything is running on Debian). New-node01 is connected as a slave to the old cluster's master. When I tried to set up the replication between the 2 new nodes (with data files copy), the slave thread stopped nearly immediatelly stating, that the command is invalid - containing illegal characters. After some investigation, it turned out, that binlog on the master (new-node01) is - let's say - corrupted. After a few iterations/checking I saw, that the error always happens with some MEMORY tables (I know I can exclude them from the replica, but want to understand the issue first). new-node01/02 running 10.3.27-MariaDB-0+deb10u1-log on latest Debian 10.9 (replication from old-node is OK), replication is GTID based. HW is a new HP Gen10 DL380. When checking the binlog on the new-node01 with mysqlbinlog, I get the following: # at 2361 #210407 11:13:34 server id 4 end_log_pos 2403 CRC32 0x90080d27 GTID 100-4-37336878143 trans /*!100001 SET @@session.gtid_seq_no=37336878143*//*!*/; START TRANSACTION /*!*/; # at 2403 #210407 11:13:34 server id 4 end_log_pos 2527 CRC32 0x27183d2f Query thread_id=341297541 exec_time=318 error_code=0 SET TIMESTAMP=1617786814/*!*/; DELETE FROM `mydb1`.`collect_output`e<FB>#<98> /*!*/; # at 2527 #210407 11:13:34 server id 4 end_log_pos 2598 CRC32 0x427f0ed7 Table_map: `mydb1`.`collect_output` mapped to number 1330 Please notice the illegal chars at the end of the "DELETE FROM" line. (DELETE FROM is normal, since new-node01 is starting up from shutdown and mydb1.collect_output is a MEMORY table -> will delete the contents, so that the replications slaves have the same data). Is this a bug or a known issue? Is there any other way to solve this, than exclude the MEMORY tables from the replication? Thanks, Tom

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[Maria-discuss] ODBC picking nearby connections?
by Antony Stone 07 Apr '21

07 Apr '21

Hi. I have the following setup: Two data centres which I shall label North and South for the following explanation. Four virtual machines, Whiskey and Xray in data centre North, and Yankee and Zulu in data centre South, which have the Debian package unixodbc installed, together with libmaodbc. Four other virtual machines, Alfa and Bravo in North and Charlie and Delta in South, all running MariaDB with Galera replication. A single hostname DB.example.com which resolves to the four IP addresses of the four database servers Alfa, Bravo, Charlie and Delta. Every instance of /etc/odbc.ini on machines Whiskey, Xray, Yankee and Zulu has the setting "SERVER=DB.example.com" in it. When I start an application which uses ODBC (in my case this is Asterisk), I find that each application server manages to connect to a database server in its own data centre. Given a 50% chance of this happening for machine Whiskey, a 50% chance for machine Xray, etc., this comes out as a 1 in 16 combined probability of happening by chance. Therefore I think it is not by chance :) I've done some packet captures, and I see each machine Whiskey, Xray, Yankee and Zulu doing a single DNS query for DB.example.com and getting the four IP addresses of Alfa, Bravo, Chalie and Delta returned. As expected, the order the addresses is returned in is randomised for different queries. Each machine then makes a single connection to MariaDB on port 3306 on one of the IP addresses in the list. This address can be the first in the list returned from the DNS resolver, or it can the the last one, or it can be on in the middle. There is no attempt to ping the four addresses and compare round-trip times, or to connect to MariaDB on more than one server and measure the query response times. Each applicaton server connects to one database server, and they always manage to connect to a machine in their own data centre. My question is: how do they do this? How does machine Whiskey manage to select one of the two IP addresses for database servers Alfa and Bravo, and connect to it, ignoring the addresses for Charlie and Delta? If I can supply any further information to help with answering this question, please let me know. Thanks, Antony. -- "Have you been drinking brake fluid again? I think you're addicted to the stuff." "No, no, it's alright - I can stop any time I want to." Please reply to the list; please *don't* CC me.

1 0

[Maria-discuss] Galera with TLS not happy.
by lejeczek 30 Mar '21

30 Mar '21

Hi guys. I'm trying to add encryption to my already working galera cluster and I've look at number of tutorials, official ones included. I've added these to configs: [mariadb] ssl_cert = /etc/my.cnf.d/certs/c8kubernode2.private.pawel.crt ssl_key = /etc/my.cnf.d/certs/c8kubernode2.private.pawel.key ssl_ca = /etc/my.cnf.d/certs/ca.crt [mysqld] wsrep_provider_options="socket.ssl=yes;socket.ssl_cert=/etc/my.cnf.d/certs/c8kubernode2.private.pawel.crt;socket.ssl_key=/etc/my.cnf.d/certs/c8kubernode2.private.pawel.key;socket.ssl_ca=/etc/my.cnf.d/certs/ca.crt" First server, above configs, starts okey with 'galera_new_cluster' but the second, I'm on Centos 8, when started as normal with systemd shows: ... 2021-03-29 17:33:34 0 [ERROR] WSREP: gcomm/src/asio_tcp.cpp:handshake_handler():128: handshake with remote endpoint ssl://10.1.1.223:4567 failed: asio.ssl:337047686: 'certificate verify failed' ( 337047686: 'error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed') 2021-03-29 17:33:36 0 [ERROR] WSREP: gcomm/src/asio_tcp.cpp:handshake_handler():128: handshake with remote endpoint ssl://10.1.1.223:4567 failed: asio.ssl:337047686: 'certificate verify failed' ( 337047686: 'error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed') ... and eventually after a moment fails. The second server has the same bits in configs only, naturally, files names are different respectively. I also see this, in case might tell more or be relevant, this is on 'galera_new_cluster' up & running: -> $ mysql --ssl -h c8kubernode2.private.pawel -u wordpress -p --ssl-verify-server-cert=true Enter password: ERROR 2026 (HY000): SSL connection error: self signed certificate in certificate chain -> $ mysql --ssl -h c8kubernode2.private.pawel -u wordpress -p --ssl-verify-server-cert=false Enter password: Welcome to the MariaDB monitor. Commands end with ; or \g. But if this is 'CN' problem then looking at the mysql server cert: -> $ _my._sslPrintCert.sh c8kubernode2.private.pawel.crt issuer=CN = "nodemaster.private.pawel," # <= here, it matches server's hostname as expected. subject=CN = c8kubernode2.private.pawel notAfter=Jul 2 20:50:57 2023 GMT Certificate: ... Also, in case it might matter, I do not have as you can see [sst] bits done yet. Any ideas someone cares to share I'll appreciate. many thanks, L.

1 0

[Maria-discuss] Introduction and Task Suggestion
by Hemant Kumar Singh 22 Mar '21

22 Mar '21

Hi everyone, I am Hemant from Nepal, currently a Computer Science Junior at NIT Warangal, India willing to take part in GSoC 2021. I saw a major priority task "MDEV-13648- Add FULL OUTER JOIN to MariaDB (https://link.getmailspring.com/link/F02B618E-9401-406B-BD92-A573A39AD858@ge…)" unresolved since gsoc 2019; but it's not listed in 2021 List of Ideas. So, I was just wondering whether I can contribute to this task for gsoc 2021. Can anyone confirm this? Regards, Hemant Kumar Singh https://iamhks.com (https://link.getmailspring.com/link/F02B618E-9401-406B-BD92-A573A39AD858@ge…)

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[Maria-discuss] Is it possible to upgrade SHA-1 and MD5 algorithms in Mariadb-10.5?
by Lukas Javorsky 22 Mar '21

22 Mar '21

Hi, In RHEL-9 we are deprecating, old SHA-1 and MD5 and that's why I want to ask you if there is any chance that upstream is going to change it, or we should do it downstream. These algorithms are no longer considered as safe, so it may be a good thing to upgrade them. AFAIK mariadb uses these algorithms in *mariadb* and *mariadb-connector-c.* Also if you have no intention to change it, is there any chance you could help us somehow. Maybe point out what we should be aware of. Please let me know what you think Lukas -- S pozdravom/ Best regards Lukáš Javorský Associate Software Engineer, Core service - Databases Red Hat <https://www.redhat.com> Purkyňova 115 (TPB-C) 612 00 Brno - Královo Pole ljavorsk(a)redhat.com <https://www.redhat.com>

5 8

[Maria-discuss] Why does MariaDB needs SELinux capability for setuid/setgid?
by Lukas Javorsky 16 Mar '21

16 Mar '21

Hi guys, I'm looking into SELinux in Fedora's MariaDB package and I can see that we have two types in MariaDB that have setuid/setgid capability. 1st: https://github.com/fedora-selinux/selinux-policy/blob/rawhide/policy/module… 2nd: https://github.com/fedora-selinux/selinux-policy/blob/rawhide/policy/module… My question is, does mysqld_t need to have this capability? I found that setuid/setgid is used inside mysqld_safe_helper (mariadbd-safe-helper). Are there any other cases when MariaDB uses these functions? Thank you for letting me know Lukas -- S pozdravom/ Best regards Lukáš Javorský Associate Software Engineer, Core service - Databases Red Hat <https://www.redhat.com> Purkyňova 115 (TPB-C) 612 00 Brno - Královo Pole ljavorsk(a)redhat.com <https://www.redhat.com>

3 5

[Maria-discuss] Problem with InnoDB: Semaphore wait after upgrading to 10.3.27
by Conor Murphy 16 Mar '21

16 Mar '21

Hi, We have a handful of servers running MariaDB 10.3. We noticed issues on two of them where we were getting issues like "InnoDB: A long semaphore wait:--Thread 140602802394880 has waited at dict0stats.cc line 1969 for 241.00 seconds the semaphore:" and crashes like "ERROR] [FATAL] InnoDB: Semaphore wait has lasted > 600 seconds. We intentionally crash the server because it appears to be hung.210215 7:14:24 [ERROR] mysqld got signal 6 ;" Turned out that these two servers were running 10.3.27 whereas the others were running 10.3.17. After downgrading the two problem servers to 10.3.17, all the issues with InnoDB semaphores stopped. Any ideas on how to track down what change between 10.3.17 to 10.3.27 might be causing this problem? Thanks, Conor

3 4