MySQL Forums
Forum List  »  Replication

5.7.23, M-M replication,secondary node memory leak
Posted by: Suantai Rousi
Date: September 14, 2018 02:52AM

Environment
OS:rhel 6.5 x64
MySQL:5.7
Melloc:jemalloc 5.1.0
Replication:master <=> master(MTR 4 threads) + keepalived

---------------------------------------------------
Problem
The first node(primary) is running normally.
The secondary node(read only), memory usage has been rising.
The EVENT "sql/Log_event"(slave_sql), memory usage has been rising.

root@150203 [(none)]> select THREAD_ID, EVENT_NAME, COUNT_ALLOC, SUM_NUMBER_OF_BYTES_ALLOC/1024/1024, CURRENT_NUMBER_OF_BYTES_USED/1024/1024 from performance_schema.memory_summary_by_thread_by_event_name order by CURRENT_NUMBER_OF_BYTES_USED desc limit 10;
+-----------+----------------------------+-------------+-------------------------------------+----------------------------------------+
| THREAD_ID | EVENT_NAME | COUNT_ALLOC | SUM_NUMBER_OF_BYTES_ALLOC/1024/1024 | CURRENT_NUMBER_OF_BYTES_USED/1024/1024 |
+-----------+----------------------------+-------------+-------------------------------------+----------------------------------------+
| 1 | memory/innodb/buf_buf_pool | 240 | 31455.00000000 | 31455.00000000 |
| 507 | memory/sql/Log_event | 18400264 | 7564.47873688 | 7564.39571095 |
| 1 | memory/innodb/hash0hash | 92 | 2356.76754761 | 897.66287231 |
| 1 | memory/innodb/os0event | 5899209 | 765.12567902 | 765.12567902 |
| 506 | memory/innodb/std | 38099468 | 1599.35388184 | 193.64311218 |
| 1 | memory/innodb/log0log | 11 | 64.01335907 | 64.01335907 |
| 508 | memory/innodb/std | 8876486 | 396.79184723 | 38.66751099 |
| 507 | memory/innodb/std | 1776900 | 74.58917236 | 9.03167725 |
| 509 | memory/mysys/IO_CACHE | 6 | 8.03128242 | 8.03128242 |
| 508 | memory/mysys/IO_CACHE | 6 | 8.03128242 | 8.03128242 |
+-----------+----------------------------+-------------+-------------------------------------+----------------------------------------+
10 rows in set (0.03 sec)

root@150203 [(none)]> select thread_id, user, current_allocated, total_allocated from sys.memory_by_thread_by_current_bytes;
+-----------+---------------------------------+-------------------+-----------------+
| thread_id | user | current_allocated | total_allocated |
+-----------+---------------------------------+-------------------+-----------------+
| 1 | sql/main | 32.42 GiB | 34.08 GiB |
| 507 | sql/slave_sql | 7.42 GiB | 12.10 GiB |
| 506 | sql/slave_io | 198.30 MiB | 100.58 GiB |
| 38914 | root@localhost | 8.53 MiB | 21.64 MiB |
| 510 | sql/slave_worker | 8.06 MiB | 8.21 MiB |
| 511 | sql/slave_worker | 42.74 KiB | 42.90 KiB |
| 39514 | root@10.25.150.203 | 16.84 KiB | 28.59 MiB |
| 39515 | root@10.25.150.203 | 16.84 KiB | 40.66 MiB |
| 39516 | root@10.25.150.203 | 16.84 KiB | 24.54 MiB |
| 3225 | repl@10.25.150.202 | 13.05 KiB | 63.97 KiB |
| 31 | innodb/buf_dump_thread | 192 bytes | 1.74 MiB |
| 30 | innodb/srv_worker_thread | 0 bytes | 0 bytes |
| 39 | sql/signal_handler | 0 bytes | 0 bytes |
| 40 | sql/compress_gtid_table | 0 bytes | 0 bytes |
| 2 | sql/thread_timer_notifier | 0 bytes | 0 bytes |
| 3 | innodb/io_read_thread | 0 bytes | 33.24 KiB |
| 4 | innodb/io_ibuf_thread | 0 bytes | 0 bytes |
| 5 | innodb/io_read_thread | 0 bytes | 27.16 KiB |
| 6 | innodb/io_log_thread | 0 bytes | 0 bytes |
| 7 | innodb/io_read_thread | 0 bytes | 5.67 KiB |
| 8 | innodb/io_read_thread | 0 bytes | 50.03 KiB |
| 9 | innodb/io_read_thread | 0 bytes | 44.77 KiB |
| 10 | innodb/io_read_thread | 0 bytes | 11.35 KiB |
| 11 | innodb/io_read_thread | 0 bytes | 22.70 KiB |
| 12 | innodb/io_read_thread | 0 bytes | 22.70 KiB |
| 13 | innodb/io_write_thread | 0 bytes | 1.68 MiB |
| 14 | innodb/io_write_thread | 0 bytes | 384.44 KiB |
| 15 | innodb/io_write_thread | 0 bytes | 650.33 KiB |
| 16 | innodb/io_write_thread | 0 bytes | 223.01 KiB |
| 17 | innodb/io_write_thread | 0 bytes | 294.46 KiB |
| 18 | innodb/io_write_thread | 0 bytes | 218.54 KiB |
| 19 | innodb/io_write_thread | 0 bytes | 274.54 KiB |
| 20 | innodb/io_write_thread | 0 bytes | 242.21 KiB |
| 21 | innodb/page_cleaner_thread | 0 bytes | 0 bytes |
| 23 | innodb/srv_error_monitor_thread | 0 bytes | 0 bytes |
| 24 | innodb/srv_lock_timeout_thread | 0 bytes | 0 bytes |
| 25 | innodb/srv_monitor_thread | 0 bytes | 18.92 MiB |
| 26 | innodb/srv_master_thread | 0 bytes | 14.24 MiB |
| 27 | innodb/srv_worker_thread | 0 bytes | 0 bytes |
| 28 | innodb/srv_purge_thread | 0 bytes | 0 bytes |
| 29 | innodb/srv_worker_thread | 0 bytes | 0 bytes |
| 32 | innodb/dict_stats_thread | -160 bytes | 218.36 KiB |
| 509 | sql/slave_worker | -5122994 bytes | 58.06 MiB |
| 508 | sql/slave_worker | -7894888734 bytes | 28.29 GiB |
+-----------+---------------------------------+-------------------+-----------------+
44 rows in set (0.28 sec)

Options: ReplyQuote


Subject
Views
Written By
Posted
5.7.23, M-M replication,secondary node memory leak
1189
September 14, 2018 02:52AM


Sorry, you can't reply to this topic. It has been closed.

Content reproduced on this site is the property of the respective copyright holders. It is not reviewed in advance by Oracle and does not necessarily represent the opinion of Oracle or any other party.