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connection_pool crash #1370

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cggy2012 opened this issue Feb 8, 2018 · 34 comments
Closed

connection_pool crash #1370

cggy2012 opened this issue Feb 8, 2018 · 34 comments

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@cggy2012
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cggy2012 commented Feb 8, 2018

mysql> select * from stats_mysql_connection_pool;
+-----------+----------------+----------+--------------+----------+----------+--------+---------+---------+-----------------+-----------------+------------+
| hostgroup | srv_host | srv_port | status | ConnUsed | ConnFree | ConnOK | ConnERR | Queries | Bytes_data_sent | Bytes_data_recv | Latency_us |
+-----------+----------------+----------+--------------+----------+----------+--------+---------+---------+-----------------+-----------------+------------+
| 0 | 192.168.11.185 | 3306 | ONLINE | 1 | 18 | 19 | 0 | 11352 | 502377 | 29366200 | 0 |
| 1 | 192.168.11.185 | 3306 | OFFLINE_SOFT | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1 | 192.168.11.186 | 3306 | ONLINE | 0 | 12 | 12 | 0 | 11322 | 2765800 | 5704774 | 0 |
| 1 | 192.168.11.187 | 3306 | ONLINE | 1 | 6 | 7 | 0 | 11321 | 2676833 | 6125501 | 0 |
| 1 | 192.168.11.188 | 3306 | ONLINE | 0 | 7 | 7 | 0 | 11553 | 2794793 | 5585408 | 0 |
| 1 | 192.168.11.189 | 3306 | ONLINE | 0 | 12 | 12 | 0 | 10401 | 2443517 | 6888625 | 0 |
| 2 | 192.168.11.190 | 3306 | ONLINE | 0 | 2 | 2 | 0 | 30 | 37086 | 885092 | 0 |
| 2 | 192.168.11.191 | 3306 | ONLINE | 0 | 2 | 2 | 0 | 33 | 41411 | 1515162 | 0 |
+-----------+----------------+----------+--------------+----------+----------+--------+---------+---------+-----------------+-----------------+------------+
8 rows in set (0.00 sec)

mysql> select * from stats_mysql_connection_pool;
ERROR 2013 (HY000): Lost connection to MySQL server during query
mysql> select * from stats_mysql_connection_pool;
ERROR 2006 (HY000): MySQL server has gone away
No connection. Trying to reconnect...
Connection id: 1
Current database: *** NONE ***

+-----------+----------------+----------+--------------+----------+----------+--------+---------+---------+-----------------+-----------------+------------+
| hostgroup | srv_host | srv_port | status | ConnUsed | ConnFree | ConnOK | ConnERR | Queries | Bytes_data_sent | Bytes_data_recv | Latency_us |
+-----------+----------------+----------+--------------+----------+----------+--------+---------+---------+-----------------+-----------------+------------+
| 0 | 192.168.11.185 | 3306 | ONLINE | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1 | 192.168.11.185 | 3306 | OFFLINE_SOFT | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1 | 192.168.11.186 | 3306 | ONLINE | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1 | 192.168.11.187 | 3306 | ONLINE | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1 | 192.168.11.188 | 3306 | ONLINE | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1 | 192.168.11.189 | 3306 | ONLINE | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 2 | 192.168.11.190 | 3306 | ONLINE | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 2 | 192.168.11.191 | 3306 | ONLINE | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
+-----------+----------------+----------+--------------+----------+----------+--------+---------+---------+-----------------+-----------------+------------+
@cggy2012
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cggy2012 commented Feb 8, 2018

+-----------------------------------------------------+--------------------+
| variable_name | variable_value |
+-----------------------------------------------------+--------------------+
| mysql-shun_on_failures | 5 |
| mysql-shun_recovery_time_sec | 10 |
| mysql-query_retries_on_failure | 1 |
| mysql-connect_retries_delay | 1 |
| mysql-connection_delay_multiplex_ms | 0 |
| mysql-connection_max_age_ms | 0 |
| mysql-connect_timeout_server_max | 10000 |
| mysql-eventslog_filename | |
| mysql-eventslog_filesize | 104857600 |
| mysql-default_charset | utf8 |
| mysql-free_connections_pct | 50 |
| mysql-session_idle_ms | 1000 |
| mysql-client_found_rows | false |
| mysql-monitor_enabled | false |
| mysql-monitor_connect_timeout | 600 |
| mysql-monitor_ping_max_failures | 3 |
| mysql-monitor_ping_timeout | 1000 |
| mysql-monitor_replication_lag_interval | 10000 |
| mysql-monitor_replication_lag_timeout | 1000 |
| mysql-monitor_groupreplication_healthcheck_interval | 5000 |
| mysql-monitor_groupreplication_healthcheck_timeout | 800 |
| mysql-monitor_replication_lag_use_percona_heartbeat | |
| mysql-monitor_query_interval | 60000 |
| mysql-monitor_query_timeout | 100 |
| mysql-monitor_slave_lag_when_null | 60 |
| mysql-monitor_wait_timeout | true |
| mysql-monitor_writer_is_also_reader | true |
| mysql-max_allowed_packet | 100000000 |
| mysql-throttle_connections_per_sec_to_hostgroup | 1000000 |
| mysql-max_transaction_time | 14400000 |
| mysql-multiplexing | true |
| mysql-forward_autocommit | false |
| mysql-enforce_autocommit_on_reads | false |
| mysql-autocommit_false_not_reusable | false |
| mysql-autocommit_false_is_transaction | false |
| mysql-verbose_query_error | false |
| mysql-hostgroup_manager_verbose | 1 |
| mysql-threshold_query_length | 524288 |
| mysql-threshold_resultset_size | 4194304 |
| mysql-query_digests_max_digest_length | 2048 |
| mysql-query_digests_max_query_length | 65000 |
| mysql-wait_timeout | 1800000 |
| mysql-throttle_max_bytes_per_second_to_client | 2147483647 |
| mysql-throttle_ratio_server_to_client | 0 |
| mysql-max_stmts_per_connection | 100 |
| mysql-max_stmts_cache | 10000 |
| mysql-mirror_max_concurrency | 16 |
| mysql-mirror_max_queue_length | 32000 |
| mysql-default_max_latency_ms | 1000 |
| mysql-query_processor_iterations | 0 |
| mysql-query_processor_regex | 1 |
| mysql-long_query_time | 1000 |
| mysql-query_cache_size_MB | 256 |
| mysql-poll_timeout_on_failure | 100 |
| mysql-server_capabilities | 45578 |
| mysql-session_idle_show_processlist | true |
| mysql-query_digests | false |
| mysql-query_digests_lowercase | false |
| mysql-servers_stats | true |
| mysql-default_reconnect | true |
| mysql-ssl_p2s_ca | (null) |
| mysql-ssl_p2s_cert | (null) |
| mysql-ssl_p2s_key | (null) |
| mysql-ssl_p2s_cipher | (null) |
| mysql-init_connect | (null) |
| mysql-default_sql_mode | |
| mysql-default_time_zone | SYSTEM |
| mysql-connpoll_reset_queue_length | 50 |
| mysql-stats_time_backend_query | false |
| mysql-stats_time_query_processor | false |
| mysql-max_connections | 10000 |
| mysql-default_query_delay | 0 |
| mysql-default_query_timeout | 30000 |
| mysql-have_compress | true |
| mysql-poll_timeout | 2000 |
| mysql-interfaces | 0.0.0.0:6033 |
| mysql-default_schema | information_schema |
| mysql-stacksize | 1048576 |
| mysql-server_version | 5.7.20 |
| mysql-connect_timeout_server | 3000 |
| mysql-monitor_username | mon_proxysql |
| mysql-monitor_password | qingtaokeDB520 |
| mysql-monitor_history | 600000 |
| mysql-monitor_connect_interval | 60000 |
| mysql-monitor_ping_interval | 10000 |
| mysql-monitor_read_only_interval | 1500 |
| mysql-monitor_read_only_timeout | 500 |
| mysql-ping_interval_server_msec | 120000 |
| mysql-ping_timeout_server | 500 |
| mysql-commands_stats | true |
| mysql-sessions_sort | true |
| mysql-connect_retries_on_failure | 10 |
| mysql-threads | 4 |
| admin-stats_credentials | stats:stats |
| admin-stats_mysql_connections | 60 |
| admin-stats_mysql_connection_pool | 60 |
| admin-stats_mysql_query_cache | 60 |
| admin-stats_system_cpu | 60 |
| admin-stats_system_memory | 60 |
| admin-telnet_admin_ifaces | (null) |
| admin-telnet_stats_ifaces | (null) |
| admin-refresh_interval | 2000 |
| admin-read_only | false |
| admin-hash_passwords | true |
| admin-cluster_username | |
| admin-cluster_password | |
| admin-cluster_check_interval_ms | 1000 |
| admin-cluster_check_status_frequency | 10 |
| admin-cluster_mysql_query_rules_diffs_before_sync | 3 |
| admin-cluster_mysql_servers_diffs_before_sync | 3 |
| admin-cluster_mysql_users_diffs_before_sync | 3 |
| admin-cluster_proxysql_servers_diffs_before_sync | 3 |
| admin-cluster_mysql_query_rules_save_to_disk | true |
| admin-cluster_mysql_servers_save_to_disk | true |
| admin-cluster_mysql_users_save_to_disk | true |
| admin-cluster_proxysql_servers_save_to_disk | true |
| admin-checksum_mysql_query_rules | true |
| admin-checksum_mysql_servers | true |
| admin-checksum_mysql_users | true |
| admin-web_enabled | false |
| admin-web_port | 6080 |
| admin-version | 1.4.6-7-g3b9e4a6 |
| admin-admin_credentials | admin:admin |
| admin-mysql_ifaces | 0.0.0.0:6032 |
+-----------------------------------------------------+--------------------+
124 rows in set (0.00 sec)

@cggy2012
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cggy2012 commented Feb 8, 2018

proxysql version 1.4.6

@cggy2012
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cggy2012 commented Feb 8, 2018

proxysql(_ZN15Query_Processor28query_parser_update_countersEP13MySQL_Session23MYSQL_COM_QUERY_commandP20__SQP_query_parser_ty+0x61)[0x496981]
proxysql(_ZN10Query_Info28query_parser_update_countersEv+0x4a)[0x47b61a]
proxysql(_ZN10Query_Info3endEv+0xe)[0x47b65e]
proxysql(_ZN13MySQL_Session10RequestEndEP17MySQL_Data_Stream+0x84)[0x47ead4]
proxysql(_ZN13MySQL_Session7handlerEv+0x228c)[0x488bbc]
proxysql(_ZN12MySQL_Thread20process_all_sessionsEv+0x1fc)[0x47021c]
proxysql(_ZN12MySQL_Thread3runEv+0xd76)[0x478ef6]
proxysql(_Z24mysql_worker_thread_funcPv+0x6c)[0x449b3c]
/lib64/libpthread.so.0(+0x7aa1)[0x7f41a6b66aa1]
/lib64/libc.so.6(clone+0x6d)[0x7f41a54a0bcd]v

@renecannao
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Hi. From the backtrace, the crash isn't related to connection pool but command counter.
Do you have a core dump?
What OS are you running?

@cggy2012
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cggy2012 commented Feb 8, 2018

core.10194.tar.gz
core.10223.tar.gz

@cggy2012
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cggy2012 commented Feb 8, 2018

my OS is Linux 2.6.32-696.20.1.el6.x86_64 #1 SMP Fri Jan 26 17:51:45 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

@cggy2012
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cggy2012 commented Feb 8, 2018

We have a query of about 4000 per second,Load balancing by 3 proxysql.

@renecannao
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Thank you for the core dump.
I am still analyzing them, but I suspect is due to mysql-query_digests=false . Can you set it to true ?

renecannao added a commit that referenced this issue Feb 9, 2018
@renecannao
MyComQueryCmd not initialized could cause crash #1370
8a2ffdb 
This happens for prepared statements, and mysql-query_digests=false
@renecannao
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Fixed in 1.4.7

@cggy2012
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cggy2012 commented Feb 9, 2018

I will test this version after 2hours , thank you.

@renecannao
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hi @cggy2012 : any result?
Thanks

pondix pushed a commit to pondix/proxysql that referenced this issue Feb 12, 2018
@renecannao @pondix
MyComQueryCmd not initialized could cause crash sysown#1370
1f9557a 
This happens for prepared statements, and mysql-query_digests=false
@cggy2012
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I'm sorry to reply to you so late , Because I can't test during the Spring Festival , Now one node is online , If there is no problem , I'll replace two other nodes tomorrow morning . by the way , I suggest setting mysql-client_found_rows default false.

@renecannao
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No problem, let me know when you have some result.
About mysql-client_found_rows : a lot of our users use Python + SQLAlchemy, that strongly rely on client_found_rows : this is why it is set to true by default.
But it is configurable, that is what matters!

@cggy2012
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OK , I will run 24 hours in production to test this version , Testing requires under high loads , And then I'll tell you the result .

@cggy2012
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cggy2012 commented Feb 23, 2018 •
edited

hello , So far , I haven't found any problems , I will continue to run in the production . There are two suggestions . first I have a error "MySQL_Session.cpp:2837:handler(): [WARNING] Error during query on (0,,3306): 1048, Column '' cannot be null" , I don't know which table or which sql have problem . second , I expect to have a function like general_log to find the cli_host of query . At last , If there is any problem I will be the first time to communicate with you .

@cggy2012
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cggy2012 commented Feb 23, 2018 •
edited

an other error "MySQL_Session.cpp:2837:handler(): [WARNING] Error during query on (1,,3306): 1290, The MySQL server is running with the --read-only option so it cannot execute this statement" , Occasionally, an update statement is sent to the wrong group .

@cggy2012
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cggy2012 commented Feb 23, 2018 •
edited

group 0 is read write , group 1 is read only .

mysql> select * from runtime_mysql_query_rules \G
*************************** 1. row ***************************
rule_id: 1
active: 1
username: NULL
schemaname: NULL
flagIN: 0
client_addr: NULL
proxy_addr: NULL
proxy_port: NULL
digest: NULL
match_digest: NULL
match_pattern: ^SELECT.*FOR UPDATE$
negate_match_pattern: 0
re_modifiers: CASELESS
flagOUT: NULL
replace_pattern: NULL
destination_hostgroup: 0
cache_ttl: NULL
reconnect: NULL
timeout: NULL
retries: NULL
delay: NULL
next_query_flagIN: NULL
mirror_flagOUT: NULL
mirror_hostgroup: NULL
error_msg: NULL
OK_msg: NULL
sticky_conn: NULL
multiplex: NULL
log: NULL
apply: 1
comment: NULL
*************************** 2. row ***************************
rule_id: 2
active: 1
username: NULL
schemaname: NULL
flagIN: 0
client_addr: NULL
proxy_addr: NULL
proxy_port: NULL
digest: NULL
match_digest: NULL
match_pattern: ^SELECT
negate_match_pattern: 0
re_modifiers: CASELESS
flagOUT: NULL
replace_pattern: NULL
destination_hostgroup: 1
cache_ttl: NULL
reconnect: NULL
timeout: NULL
retries: NULL
delay: NULL
next_query_flagIN: NULL
mirror_flagOUT: NULL
mirror_hostgroup: NULL
error_msg: NULL
OK_msg: NULL
sticky_conn: NULL
multiplex: NULL
log: NULL
apply: 1
comment: NULL
*************************** 3. row ***************************
rule_id: 3
active: 1
username: NULL
schemaname: NULL
flagIN: 0
client_addr: NULL
proxy_addr: NULL
proxy_port: NULL
digest: NULL
match_digest: NULL
match_pattern: ^(?SELECT
negate_match_pattern: 0
re_modifiers: CASELESS
flagOUT: NULL
replace_pattern: NULL
destination_hostgroup: 1
cache_ttl: NULL
reconnect: NULL
timeout: NULL
retries: NULL
delay: NULL
next_query_flagIN: NULL
mirror_flagOUT: NULL
mirror_hostgroup: NULL
error_msg: NULL
OK_msg: NULL
sticky_conn: NULL
multiplex: NULL
log: NULL
apply: 1
comment: NULL
3 rows in set (0.00 sec)

@cggy2012
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the sql is UPDATE table SET activity_id=?, item_id=?, pic_url=?, price=?, sale_price=?, istmall=?, start_time=?, end_time=?, update_time=? WHERE id = ?

@renecannao
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About the additional information in the error log, see #1060 (comment) .
About the query sent to the wrong server, how did you identify it?

@cggy2012
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I use mysql group replication , 192.168.11.185 is primary node (read-write) , the other is slave node (read-only).

proxySQL mysql_server
mysql> select hostgroup_id,hostname,port,status,weight from runtime_mysql_servers;
+--------------+----------------+------+--------------+--------+
| hostgroup_id | hostname | port | status | weight |
+--------------+----------------+------+--------------+--------+
| 0 | 192.168.11.185 | 3306 | ONLINE | 1 |
| 1 | 192.168.11.191 | 3306 | ONLINE | 1 |
| 1 | 192.168.11.190 | 3306 | ONLINE | 1 |
| 1 | 192.168.11.189 | 3306 | ONLINE | 1 |
| 1 | 192.168.11.188 | 3306 | ONLINE | 1 |
| 1 | 192.168.11.187 | 3306 | ONLINE | 1 |
| 1 | 192.168.11.186 | 3306 | ONLINE | 1 |
| 1 | 192.168.11.185 | 3306 | OFFLINE_SOFT | 1 |
+--------------+----------------+------+--------------+--------+

proxySQL query_rules
mysql> select rule_id,active,flagIN,match_pattern,negate_match_pattern,destination_hostgroup,apply from runtime_mysql_query_rules;
+---------+--------+--------+----------------------+----------------------+-----------------------+-------+
| rule_id | active | flagIN | match_pattern | negate_match_pattern | destination_hostgroup | apply |
+---------+--------+--------+----------------------+----------------------+-----------------------+-------+
| 1 | 1 | 0 | ^SELECT.*FOR UPDATE$ | 0 | 0 | 1 |
| 2 | 1 | 0 | ^SELECT | 0 | 1 | 1 |
| 3 | 1 | 0 | ^(?SELECT | 0 | 1 | 1 |
+---------+--------+--------+----------------------+----------------------+-----------------------+-------+

Run for a few hours , I get a error in proxysql.log "2018-02-23 16:38:02 MySQL_Session.cpp:2837:handler(): [WARNING] Error during query on (1,192.168.11.190,3306): 1290, The MySQL server is running with the --read-only option so it cannot execute this statement"

normal , the update should sent to destination_hostgroup 0 , I used to have this problem , Especially in the morning rush hour .

@renecannao
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Are you using native support for Group Replication ?
Can you send me the full error log for further investigation?

@cggy2012
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About the additional information in the error log, see #1060 (comment) .
it is great ! Can you update the Global Variables of wiki , I do not know the meaning of some variables .

@cggy2012
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I think this problem is had to find out , because the error is very sample .
proxysql.zip

@cggy2012
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search for the keyword “read-only”

@cggy2012
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cggy2012 commented Feb 23, 2018 •
edited

I use a script to detect the status of the mysql group replication and update mysql_server table .
gr_sw_mode_checker.zip

@renecannao
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You should use native support for Group Replication, instead of this script.
You are running LOAD MYSQL SERVERS TO RUNTIME every 10 seconds, that is not recommended.

$ grep "LOAD MYSQL SERVERS TO RUNTIME" proxysql.log | wc -l
1018

Native group replication is faster.

Can you also attach the output of SELECT * FROM stats_mysql_connection_pool ?

@cggy2012
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thank you , I will make some adjustments .

mysql> SELECT * FROM stats_mysql_connection_pool;
+-----------+----------------+----------+--------------+----------+----------+--------+---------+---------+-----------------+-----------------+------------+
| hostgroup | srv_host | srv_port | status | ConnUsed | ConnFree | ConnOK | ConnERR | Queries | Bytes_data_sent | Bytes_data_recv | Latency_us |
+-----------+----------------+----------+--------------+----------+----------+--------+---------+---------+-----------------+-----------------+------------+
| 0 | 192.168.11.185 | 3306 | ONLINE | 2 | 9 | 11 | 0 | 3872303 | 167947957 | 6247638310 | 149 |
| 1 | 192.168.11.185 | 3306 | OFFLINE_SOFT | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 149 |
| 1 | 192.168.11.186 | 3306 | ONLINE | 0 | 4 | 4 | 0 | 2693722 | 557668243 | 1712497343 | 157 |
| 1 | 192.168.11.187 | 3306 | ONLINE | 0 | 4 | 4 | 0 | 2439591 | 556797801 | 1997393108 | 161 |
| 1 | 192.168.11.188 | 3306 | ONLINE | 0 | 4 | 4 | 0 | 2440846 | 557340412 | 1834757174 | 161 |
| 1 | 192.168.11.189 | 3306 | ONLINE | 0 | 4 | 4 | 0 | 2423518 | 553313616 | 1743347804 | 158 |
| 1 | 192.168.11.190 | 3306 | ONLINE | 0 | 4 | 5 | 0 | 2532220 | 550259825 | 1638590750 | 169 |
| 1 | 192.168.11.191 | 3306 | ONLINE | 0 | 4 | 4 | 0 | 2438021 | 557781697 | 1968764128 | 160 |
+-----------+----------------+----------+--------------+----------+----------+--------+---------+---------+-----------------+-----------------+------------+

@renecannao
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It is not clear what is happening here. Neither it is clear if it is a problem with ProxySQL routing (probably not).
Have you checked MySQL's error log on 192.168.11.190 ?

@cggy2012
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There is no error in error log , I will use native support for Group Replication first , Then determine if there is still this problem .

@cggy2012
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Yesterday there have been three read-only error .

@renecannao
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Is there a reason why mysql-query_digests=false ?
Can you verify if you still have errors with mysql-query_digests=true ?

@cggy2012
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cggy2012 commented Mar 6, 2018

I want to turn off some of the features I will not use . I will try to set mysql-query_digests=true .

@cggy2012
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cggy2012 commented Mar 6, 2018

mysql> set mysql-query_digests = 'true';
Query OK, 1 row affected (0.00 sec)

mysql> LOAD MYSQL VARIABLES TO RUNTIME;
Query OK, 0 rows affected (0.00 sec)

mysql> SAVE MYSQL VARIABLES TO DISK;
Query OK, 93 rows affected (0.00 sec)

mysql> show variables like '%dig%';
+---------------------------------------+-------+
| Variable_name | Value |
+---------------------------------------+-------+
| mysql-query_digests_max_digest_length | 2048 |
| mysql-query_digests_max_query_length | 65000 |
| mysql-query_digests | true |
| mysql-query_digests_lowercase | false |
+---------------------------------------+-------+
4 rows in set (0.00 sec)

mysql> select * from stats_mysql_query_digest;
Empty set (0.00 sec)

mysql> select * from stats_mysql_query_digest;
Empty set (0.00 sec)

When I set set mysql-query_digests = 'true' , It did not work ..

@renecannao
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also mysql-commands_stats needs to be enabled.

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