Добрый день.
Крутится две базы - два разных проекта, суммарно 2.2к запросов в сек.
Наткнулся на странный эффект.
Понадобилось добавить в таблицу одной из баз, дополнительный ключ.
В таблице 1.4М записей.
При добавлении ключа (операция заняла 30 сек на одной ноде),
на две минуты зависли запросы к базе соседнего проекта.
[mysqld]
user = mysql
pid-file = /var/run/mysqld/mysqld.pid
socket = /var/run/mysqld/mysqld.sock
port = 3306
basedir = /usr
datadir = /var/lib/mysql
tmpdir = /dev/shm
lc-messages-dir = /usr/share/mysql
skip-external-locking
low-priority-updates
character-set-server = utf8
skip-name-resolve
net_read_timeout=120
net_write_timeout=240
thread_pool_idle_timeout=120
explicit_defaults_for_timestamp=TRUE
bind-address=db-node0
binlog_format=ROW
log_bin = galera.bin
binlog_cache_size=256M
back_log = 100
max_binlog_files = 10
max_binlog_size = 1G
key_buffer_size = 80M
max_allowed_packet = 64M
thread_stack = 512K
thread_cache_size = 1000
innodb_thread_concurrency=400
max_connections = 2000
tmp_table_size = 256M
max_heap_table_size = 256M
max_prepared_stmt_count=500000
max_connect_errors = 30
sort_buffer_size = 4M
join_buffer_size = 4M
read_rnd_buffer_size = 128M
default_storage_engine = InnoDB
query_cache_type=1
query_cache_size = 128M
query_cache_strip_comments = 'ON'
query_cache_limit = 10M
optimizer_search_depth=10
slow_query_log_file = /var/log/mysql/slow.log
long_query_time = 2
slow_query_log_always_write_time = 2
slow_query_log = 'ON'
max_slowlog_files = 7
max_slowlog_size = 100M
log_error = /var/log/mysql/error.log
innodb_buffer_pool_size = 64G
innodb_lock_wait_timeout = 100
innodb_file_per_table = true
innodb_log_files_in_group = 2
innodb_log_file_size = 4G
innodb_flush_log_at_trx_commit = 1
innodb_read_io_threads = 32
innodb_write_io_threads = 16
innodb_io_capacity = 4000
innodb_buffer_pool_populate = 1
innodb_autoinc_lock_mode=2
read_buffer_size = 1M
bulk_insert_buffer_size = 8M
myisam_sort_buffer_size = 8M
myisam_max_sort_file_size = 10G
myisam_repair_threads = 1
wsrep_provider=/usr/lib/libgalera_smm.so
wsrep_provider_options="gcache.size=32G;gcache.page_size=1G;"
wsrep_cluster_name="galera"
wsrep_cluster_address=gcomm://
172.17.3.31,172.17.3.33,172.17.3.47,172.17.3.30
wsrep_node_name="db-node0"
wsrep_node_address=db-node0
wsrep_node_incoming_address=db-node0
wsrep_slave_threads=64
wsrep_certify_nonPK=1
wsrep_convert_LOCK_to_trx=0
wsrep_retry_autocommit=1
wsrep_auto_increment_control=1
wsrep_sst_method=rsync
wsrep_sst_receive_address=db-node0
wsrep_sst_auth=uname:pass
wsrep_sst_donor=db-nodex
wsrep_log_conflicts=ON