Details
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New Feature
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Status: Open (View Workflow)
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Major
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Resolution: Unresolved
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23.08.4
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None
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Linux n.a.
Description
The cli maxctrl command list servers does not show the Connections correctly AND State Master is very strange in SchemaRouter sharding system where IMHO all shards should be treated equally. And maxscale keeps too many connections open.
In the following example we have application 6 Connections open:
2 to shard 1
3 to shard 2
1 to shard 3
root@ubu2204-max:/tmp# maxctrl list services
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┌─────────────────┬──────────────┬─────────────┬───────────────────┬────────────────────────┐
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│ Service │ Router │ Connections │ Total Connections │ Targets │
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├─────────────────┼──────────────┼─────────────┼───────────────────┼────────────────────────┤
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│ Sharded-Service │ schemarouter │ 6 │ 6 │ shard1, shard2, shard3 │
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└─────────────────┴──────────────┴─────────────┴───────────────────┴────────────────────────┘
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root@ubu2204-max:/tmp# maxctrl list servers
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┌────────┬──────────────┬──────┬─────────────┬─────────────────┬───────────┬─────────────────┐
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│ Server │ Address │ Port │ Connections │ State │ GTID │ Monitor │
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├────────┼──────────────┼──────┼─────────────┼─────────────────┼───────────┼─────────────────┤
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│ shard1 │ 10.139.158.1 │ 3363 │ 6 │ Master, Running │ 0-3363-42 │ MariaDB-Monitor │
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├────────┼──────────────┼──────┼─────────────┼─────────────────┼───────────┼─────────────────┤
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│ shard2 │ 10.139.158.1 │ 3364 │ 6 │ Running │ 0-3364-47 │ MariaDB-Monitor │
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├────────┼──────────────┼──────┼─────────────┼─────────────────┼───────────┼─────────────────┤
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│ shard3 │ 10.139.158.1 │ 3365 │ 6 │ Running │ 0-3365-37 │ MariaDB-Monitor │
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└────────┴──────────────┴──────┴─────────────┴─────────────────┴───────────┴─────────────────┘
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--> Master looks strange
And we have in total 18 connections open (SHOW PROCESSLIST):
show processlist;
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+----+----------+----------------------+---------------+---------+------+----------+------------------+----------+
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| Id | User | Host | db | Command | Time | State | Info | Progress |
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+----+----------+----------------------+---------------+---------+------+----------+------------------+----------+
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| 33 | mysql | localhost | NULL | Query | 0 | starting | show processlist | 0.000 |
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| 35 | maxscale | 10.139.158.211:41996 | NULL | Sleep | 0 | | NULL | 0.000 |
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| 37 | app | 10.139.158.211:49234 | customer_0010 | Sleep | 316 | | NULL | 0.000 |
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| 38 | app | 10.139.158.211:38886 | customer_0011 | Sleep | 296 | | NULL | 0.000 |
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| 39 | app | 10.139.158.211:58320 | NULL | Sleep | 287 | | NULL | 0.000 |
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| 40 | app | 10.139.158.211:40536 | NULL | Sleep | 282 | | NULL | 0.000 |
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| 41 | app | 10.139.158.211:40538 | NULL | Sleep | 278 | | NULL | 0.000 |
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| 43 | app | 10.139.158.211:50232 | NULL | Sleep | 269 | | NULL | 0.000 |
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+----+----------+----------------------+---------------+---------+------+----------+------------------+----------+
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|
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show processlist;
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+----+----------+----------------------+---------------+---------+------+----------+------------------+----------+
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| Id | User | Host | db | Command | Time | State | Info | Progress |
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+----+----------+----------------------+---------------+---------+------+----------+------------------+----------+
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| 32 | mysql | localhost | NULL | Query | 0 | starting | show processlist | 0.000 |
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| 34 | maxscale | 10.139.158.211:51294 | NULL | Sleep | 1 | | NULL | 0.000 |
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| 36 | app | 10.139.158.211:60042 | NULL | Sleep | 321 | | NULL | 0.000 |
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| 37 | app | 10.139.158.211:37718 | NULL | Sleep | 301 | | NULL | 0.000 |
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| 38 | app | 10.139.158.211:51646 | customer_0020 | Sleep | 292 | | NULL | 0.000 |
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| 39 | app | 10.139.158.211:55992 | customer_0021 | Sleep | 287 | | NULL | 0.000 |
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| 40 | app | 10.139.158.211:56006 | customer_0022 | Sleep | 282 | | NULL | 0.000 |
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| 42 | app | 10.139.158.211:34016 | NULL | Sleep | 273 | | NULL | 0.000 |
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+----+----------+----------------------+---------------+---------+------+----------+------------------+----------+
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show processlist;
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+----+----------+----------------------+---------------+---------+------+----------+------------------+----------+
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| Id | User | Host | db | Command | Time | State | Info | Progress |
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+----+----------+----------------------+---------------+---------+------+----------+------------------+----------+
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| 32 | mysql | localhost | NULL | Query | 0 | starting | show processlist | 0.000 |
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| 34 | maxscale | 10.139.158.211:56696 | NULL | Sleep | 0 | | NULL | 0.000 |
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| 36 | app | 10.139.158.211:60772 | NULL | Sleep | 325 | | NULL | 0.000 |
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| 37 | app | 10.139.158.211:39592 | NULL | Sleep | 305 | | NULL | 0.000 |
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| 38 | app | 10.139.158.211:59874 | NULL | Sleep | 296 | | NULL | 0.000 |
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| 39 | app | 10.139.158.211:39492 | NULL | Sleep | 291 | | NULL | 0.000 |
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| 40 | app | 10.139.158.211:39500 | NULL | Sleep | 287 | | NULL | 0.000 |
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| 42 | app | 10.139.158.211:45858 | customer_0030 | Sleep | 278 | | NULL | 0.000 |
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+----+----------+----------------------+---------------+---------+------+----------+------------------+----------+
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Much too many connections open. This will not scale well on a system with many tenants!!!
What IMHO is wrong:
1.) State: Master
2.) list servers: Connections should be 2,3,1 and not 3 x 6
3.) Too many connections open (see show processlist)