MySQL InnoDB Cluster – HowTo #1 – Monitor your cluster | dasini.net

MySQL InnoDB Cluster – HowTo #1 – Monitor your cluster

April 11, 2019

Tags: group replication

How do I… Monitor the status & the configuration of my cluster?

Short answer

Use:

status()

Long answer…

Assuming you already have a MySQL InnoDB Cluster up and running. If not, please RTFM 🙂
Additionally you can read this tutorial and this article from my colleague lefred or this one on Windows Platform from my colleague Ivan.

I’m using MySQL 8.0.15

MySQL localhost:33060+ JS> session.sql('SELECT VERSION()')
+-----------+
| VERSION() |
+-----------+
| 8.0.15    |
+-----------+

MySQL localhost:33060+ JS> session.sql('SELECT VERSION()')

+-----------+

| VERSION() |

+-----------+

| 8.0.15 |

+-----------+

Let’s connect to my cluster

$ mysqlsh root@localhost --cluster

Please provide the password for 'root@localhost': ****
MySQL Shell 8.0.15

Copyright (c) 2016, 2019, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its affiliates.
Other names may be trademarks of their respective owners.

Type '\help' or '\?' for help; '\quit' to exit.
Creating a session to 'root@localhost'
Fetching schema names for autocompletion... Press ^C to stop.
Your MySQL connection id is 1520 (X protocol)
Server version: 8.0.15 MySQL Community Server - GPL
No default schema selected; type \use <schema> to set one.
You are connected to a member of cluster 'pocCluster'.
Variable 'cluster' is set.
Use cluster.status() in scripting mode to get status of this cluster or cluster.help() for more commands.

$ mysqlsh root@localhost --cluster

Please provide the password for 'root@localhost': ****

MySQL Shell 8.0.15

Oracle is a registered trademark of Oracle Corporation and/or its affiliates.

Other names may be trademarks of their respective owners.

Type '\help' or '\?' for help; '\quit' to exit.

Creating a session to 'root@localhost'

Fetching schema names for autocompletion... Press ^C to stop.

Your MySQL connection id is 1520 (X protocol)

Server version: 8.0.15 MySQL Community Server - GPL

No default schema selected; type \use <schema> to set one.

You are connected to a member of cluster 'pocCluster'.

Variable 'cluster' is set.

Use cluster.status() in scripting mode to get status of this cluster or cluster.help() for more commands.

The “– – cluster” argument enables cluster management by setting the global variable.
This variable is a reference to the MySQL InnoDB Cluster object session. It will give you access (among others) to the status() method that allows you to check and monitor the cluster.

Ask for help

The built-in help is simply awesome!

MySQL localhost:33060+ JS> cluster.help('status')
NAME
      status - Describe the status of the cluster.

SYNTAX
      <Cluster>.status([options])

WHERE
      options: Dictionary with options.

RETURNS
       A JSON object describing the status of the cluster.

DESCRIPTION
      This function describes the status of the cluster including its
      ReplicaSets and Instances. The following options may be given to control
      the amount of information gathered and returned.

      - extended: if true, includes information about transactions processed by
        connection and applier, as well as groupName and memberId values.
      - queryMembers: if true, connect to each Instance of the ReplicaSets to
        query for more detailed stats about the replication machinery.

EXCEPTIONS
      MetadataError in the following scenarios:

      - If the Metadata is inaccessible.
      - If the Metadata update operation failed.

MySQL localhost:33060+ JS> cluster.help('status')

NAME

status - Describe the status of the cluster.

SYNTAX

<Cluster>.status([options])

WHERE

options: Dictionary with options.

RETURNS

A JSON object describing the status of the cluster.

DESCRIPTION

This function describes the status of the cluster including its

ReplicaSets and Instances. The following options may be given to control

the amount of information gathered and returned.

- extended: if true, includes information about transactions processed by

connection and applier, as well as groupName and memberId values.

- queryMembers: if true, connect to each Instance of the ReplicaSets to

query for more detailed stats about the replication machinery.

EXCEPTIONS

MetadataError in the following scenarios:

- If the Metadata is inaccessible.

- If the Metadata update operation failed.

Cluster status

So let’s discover the status of our cluster

MySQL localhost:33060+ JS> cluster.status()
{
    "clusterName": "pocCluster", 
    "defaultReplicaSet": {
        "name": "default", 
        "primary": "172.19.0.11:3306", 
        "ssl": "REQUIRED", 
        "status": "OK", 
        "statusText": "Cluster is ONLINE and can tolerate up to ONE failure.", 
        "topology": {
            "172.19.0.11:3306": {
                "address": "172.19.0.11:3306", 
                "mode": "R/W", 
                "readReplicas": {}, 
                "role": "HA", 
                "status": "ONLINE"
            }, 
            "172.19.0.12:3306": {
                "address": "172.19.0.12:3306", 
                "mode": "R/O", 
                "readReplicas": {}, 
                "role": "HA", 
                "status": "ONLINE"
            }, 
            "172.19.0.13:3306": {
                "address": "172.19.0.13:3306", 
                "mode": "R/O", 
                "readReplicas": {}, 
                "role": "HA", 
                "status": "ONLINE"
            }
        }, 
        "topologyMode": "Single-Primary"
    }, 
    "groupInformationSourceMember": "172.19.0.11:3306"
}

MySQL localhost:33060+ JS> cluster.status()

{

"clusterName": "pocCluster",

"defaultReplicaSet": {

"name": "default",

"primary": "172.19.0.11:3306",

"ssl": "REQUIRED",

"status": "OK",

"statusText": "Cluster is ONLINE and can tolerate up to ONE failure.",

"topology": {

"172.19.0.11:3306": {

"address": "172.19.0.11:3306",

"mode": "R/W",

"readReplicas": {},

"role": "HA",

"status": "ONLINE"

"172.19.0.12:3306": {

"address": "172.19.0.12:3306",

"mode": "R/O",

"readReplicas": {},

"role": "HA",

"status": "ONLINE"

"172.19.0.13:3306": {

"address": "172.19.0.13:3306",

"mode": "R/O",

"readReplicas": {},

"role": "HA",

"status": "ONLINE"

}

"topologyMode": "Single-Primary"

"groupInformationSourceMember": "172.19.0.11:3306"

}

Note:
The instance’s state in the cluster directly influences the information provided in the status report. Therefore ensure the instance you are connected to has a status of ONLINE.

As you can see, by default status() gives you a lot of relevant information.
Thus it could be used to monitor your cluster although the best tool available to monitor your MySQL InnoDB Cluster (but also MySQL Replication, MySQL NDB Cluster and obviously your standalone MySQL servers) is MySQL Enterprise Monitor.

More details with “A Guide to MySQL Enterprise Monitor“.

Extended cluster status

MySQL Group Replication provides several metrics and detailed information about the underlying cluster in MySQL InnoDB clusters.
These metrics which are used for monitoring are based on these Performance Schema tables.

Some of these information are available through MySQL Shell. You can control the amount of information gathered and returned with 2 options: extended & queryMembers.

extended

if enabled, includes information about groupName and memberID for each member; and general statistics about the number of transactions checked, proposed, rejected by members…

MySQL localhost:33060+ JS> cluster.status({extended:true})
{
    "clusterName": "pocCluster", 
    "defaultReplicaSet": {
        "groupName": "72568575-561c-11e9-914c-0242ac13000b", 
        "name": "default", 
        "primary": "172.19.0.11:3306", 
        "ssl": "REQUIRED", 
        "status": "OK", 
        "statusText": "Cluster is ONLINE and can tolerate up to ONE failure.", 
        "topology": {
            "172.19.0.11:3306": {
                "address": "172.19.0.11:3306", 
                "memberId": "4a85f6c4-561c-11e9-8401-0242ac13000b", 
                "mode": "R/W", 
                "readReplicas": {}, 
                "role": "HA", 
                "status": "ONLINE", 
                "transactions": {
                    "appliedCount": 2, 
                    "checkedCount": 53, 
                    "committedAllMembers": "4a85f6c4-561c-11e9-8401-0242ac13000b:1-12,
72568575-561c-11e9-914c-0242ac13000b:1-51", 
                    "conflictsDetectedCount": 0, 
                    "inApplierQueueCount": 0, 
                    "inQueueCount": 0, 
                    "lastConflictFree": "72568575-561c-11e9-914c-0242ac13000b:56", 
                    "proposedCount": 53, 
                    "rollbackCount": 0
                }
            }, 
            "172.19.0.12:3306": {
                "address": "172.19.0.12:3306", 
                "memberId": "4ad75450-561c-11e9-baa8-0242ac13000c", 
                "mode": "R/O", 
                "readReplicas": {}, 
                "role": "HA", 
                "status": "ONLINE", 
                "transactions": {
                    "appliedCount": 44, 
                    "checkedCount": 43, 
                    "committedAllMembers": "4a85f6c4-561c-11e9-8401-0242ac13000b:1-12,
72568575-561c-11e9-914c-0242ac13000b:1-41", 
                    "conflictsDetectedCount": 0, 
                    "inApplierQueueCount": 0, 
                    "inQueueCount": 0, 
                    "lastConflictFree": "72568575-561c-11e9-914c-0242ac13000b:52", 
                    "proposedCount": 0, 
                    "rollbackCount": 0
                }
            }, 
            "172.19.0.13:3306": {
                "address": "172.19.0.13:3306", 
                "memberId": "4b77c1ec-561c-11e9-9cc1-0242ac13000d", 
                "mode": "R/O", 
                "readReplicas": {}, 
                "role": "HA", 
                "status": "ONLINE", 
                "transactions": {
                    "appliedCount": 42, 
                    "checkedCount": 42, 
                    "committedAllMembers": "4a85f6c4-561c-11e9-8401-0242ac13000b:1-12,
72568575-561c-11e9-914c-0242ac13000b:1-41", 
                    "conflictsDetectedCount": 0, 
                    "inApplierQueueCount": 0, 
                    "inQueueCount": 0, 
                    "lastConflictFree": "72568575-561c-11e9-914c-0242ac13000b:53", 
                    "proposedCount": 0, 
                    "rollbackCount": 0
                }
            }
        }, 
        "topologyMode": "Single-Primary"
    }, 
    "groupInformationSourceMember": "172.19.0.11:3306"
}

MySQL localhost:33060+ JS> cluster.status({extended:true})

{

"clusterName": "pocCluster",

"defaultReplicaSet": {

"groupName": "72568575-561c-11e9-914c-0242ac13000b",

"name": "default",

"primary": "172.19.0.11:3306",

"ssl": "REQUIRED",

"status": "OK",

"statusText": "Cluster is ONLINE and can tolerate up to ONE failure.",

"topology": {

"172.19.0.11:3306": {

"address": "172.19.0.11:3306",

"memberId": "4a85f6c4-561c-11e9-8401-0242ac13000b",

"mode": "R/W",

"readReplicas": {},

"role": "HA",

"status": "ONLINE",

"transactions": {

"appliedCount": 2,

"checkedCount": 53,

"committedAllMembers": "4a85f6c4-561c-11e9-8401-0242ac13000b:1-12,

72568575-561c-11e9-914c-0242ac13000b:1-51",

"conflictsDetectedCount": 0,

"inApplierQueueCount": 0,

"inQueueCount": 0,

"lastConflictFree": "72568575-561c-11e9-914c-0242ac13000b:56",

"proposedCount": 53,

"rollbackCount": 0

}

"172.19.0.12:3306": {

"address": "172.19.0.12:3306",

"memberId": "4ad75450-561c-11e9-baa8-0242ac13000c",

"mode": "R/O",

"readReplicas": {},

"role": "HA",

"status": "ONLINE",

"transactions": {

"appliedCount": 44,

"checkedCount": 43,

"committedAllMembers": "4a85f6c4-561c-11e9-8401-0242ac13000b:1-12,

72568575-561c-11e9-914c-0242ac13000b:1-41",

"conflictsDetectedCount": 0,

"inApplierQueueCount": 0,

"inQueueCount": 0,

"lastConflictFree": "72568575-561c-11e9-914c-0242ac13000b:52",

"proposedCount": 0,

"rollbackCount": 0

}

"172.19.0.13:3306": {

"address": "172.19.0.13:3306",

"memberId": "4b77c1ec-561c-11e9-9cc1-0242ac13000d",

"mode": "R/O",

"readReplicas": {},

"role": "HA",

"status": "ONLINE",

"transactions": {

"appliedCount": 42,

"checkedCount": 42,

"committedAllMembers": "4a85f6c4-561c-11e9-8401-0242ac13000b:1-12,

72568575-561c-11e9-914c-0242ac13000b:1-41",

"conflictsDetectedCount": 0,

"inApplierQueueCount": 0,

"inQueueCount": 0,

"lastConflictFree": "72568575-561c-11e9-914c-0242ac13000b:53",

"proposedCount": 0,

"rollbackCount": 0

}

"topologyMode": "Single-Primary"

"groupInformationSourceMember": "172.19.0.11:3306"

}

queryMembers

if enabled, includes information about recovery and regular transaction I/O, applier worker thread statistic and any lags; applier coordinator statistic…

MySQL localhost:33060+ JS> cluster.status({queryMembers:true})
{
    "clusterName": "pocCluster", 
    "defaultReplicaSet": {
        "name": "default", 
        "primary": "172.19.0.11:3306", 
        "ssl": "REQUIRED", 
        "status": "OK", 
        "statusText": "Cluster is ONLINE and can tolerate up to ONE failure.", 
        "topology": {
            "172.19.0.11:3306": {
                "address": "172.19.0.11:3306", 
                "mode": "R/W", 
                "readReplicas": {}, 
                "role": "HA", 
                "status": "ONLINE", 
                "transactions": {
                    "connection": {
                        "lastHeartbeatTimestamp": "", 
                        "lastQueued": {
                            "endTimestamp": "2019-04-03 14:26:33.394755", 
                            "immediateCommitTimestamp": "", 
                            "immediateCommitToEndTime": null, 
                            "originalCommitTimestamp": "", 
                            "originalCommitToEndTime": null, 
                            "queueTime": 0.000077, 
                            "startTimestamp": "2019-04-03 14:26:33.394678", 
                            "transaction": "72568575-561c-11e9-914c-0242ac13000b:13"
                        }, 
                        "receivedHeartbeats": 0, 
                        "receivedTransactionSet": "4a85f6c4-561c-11e9-8401-0242ac13000b:1-12,
72568575-561c-11e9-914c-0242ac13000b:1-65", 
                        "threadId": null
                    }, 
                    "workers": [
                        {
                            "lastApplied": {
                                "applyTime": 0.022927, 
                                "endTimestamp": "2019-04-03 14:26:33.417643", 
                                "immediateCommitTimestamp": "", 
                                "immediateCommitToEndTime": null, 
                                "originalCommitTimestamp": "", 
                                "originalCommitToEndTime": null, 
                                "retries": 0, 
                                "startTimestamp": "2019-04-03 14:26:33.394716", 
                                "transaction": "72568575-561c-11e9-914c-0242ac13000b:13"
                            }, 
                            "threadId": 58
                        }
                    ]
                }
            }, 
            "172.19.0.12:3306": {
                "address": "172.19.0.12:3306", 
                "mode": "R/O", 
                "readReplicas": {}, 
                "role": "HA", 
                "status": "ONLINE", 
                "transactions": {
                    "connection": {
                        "lastHeartbeatTimestamp": "", 
                        "lastQueued": {
                            "endTimestamp": "2019-04-03 15:42:30.855989", 
                            "immediateCommitTimestamp": "", 
                            "immediateCommitToEndTime": null, 
                            "originalCommitTimestamp": "2019-04-03 15:42:30.854594", 
                            "originalCommitToEndTime": 0.001395, 
                            "queueTime": 0.000476, 
                            "startTimestamp": "2019-04-03 15:42:30.855513", 
                            "transaction": "72568575-561c-11e9-914c-0242ac13000b:65"
                        }, 
                        "receivedHeartbeats": 0, 
                        "receivedTransactionSet": "4a85f6c4-561c-11e9-8401-0242ac13000b:1-12,
72568575-561c-11e9-914c-0242ac13000b:1-65", 
                        "threadId": null
                    }, 
                    "workers": [
                        {
                            "lastApplied": {
                                "applyTime": 0.024685, 
                                "endTimestamp": "2019-04-03 15:42:30.880361", 
                                "immediateCommitTimestamp": "", 
                                "immediateCommitToEndTime": null, 
                                "originalCommitTimestamp": "2019-04-03 15:42:30.854594", 
                                "originalCommitToEndTime": 0.025767, 
                                "retries": 0, 
                                "startTimestamp": "2019-04-03 15:42:30.855676", 
                                "transaction": "72568575-561c-11e9-914c-0242ac13000b:65"
                            }, 
                            "threadId": 54
                        }
                    ]
                }
            }, 
            "172.19.0.13:3306": {
                "address": "172.19.0.13:3306", 
                "mode": "R/O", 
                "readReplicas": {}, 
                "role": "HA", 
                "status": "ONLINE", 
                "transactions": {
                    "connection": {
                        "lastHeartbeatTimestamp": "", 
                        "lastQueued": {
                            "endTimestamp": "2019-04-03 15:42:30.855678", 
                            "immediateCommitTimestamp": "", 
                            "immediateCommitToEndTime": null, 
                            "originalCommitTimestamp": "2019-04-03 15:42:30.854594", 
                            "originalCommitToEndTime": 0.001084, 
                            "queueTime": 0.000171, 
                            "startTimestamp": "2019-04-03 15:42:30.855507", 
                            "transaction": "72568575-561c-11e9-914c-0242ac13000b:65"
                        }, 
                        "receivedHeartbeats": 0, 
                        "receivedTransactionSet": "4a85f6c4-561c-11e9-8401-0242ac13000b:1-12,
72568575-561c-11e9-914c-0242ac13000b:1-65", 
                        "threadId": null
                    }, 
                    "workers": [
                        {
                            "lastApplied": {
                                "applyTime": 0.021354, 
                                "endTimestamp": "2019-04-03 15:42:30.877398", 
                                "immediateCommitTimestamp": "", 
                                "immediateCommitToEndTime": null, 
                                "originalCommitTimestamp": "2019-04-03 15:42:30.854594", 
                                "originalCommitToEndTime": 0.022804, 
                                "retries": 0, 
                                "startTimestamp": "2019-04-03 15:42:30.856044", 
                                "transaction": "72568575-561c-11e9-914c-0242ac13000b:65"
                            }, 
                            "threadId": 54
                        }
                    ]
                }
            }
        }, 
        "topologyMode": "Single-Primary"
    }, 
    "groupInformationSourceMember": "172.19.0.11:3306"
}

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MySQL localhost:33060+ JS> cluster.status({queryMembers:true})

{

"clusterName": "pocCluster",

"defaultReplicaSet": {

"name": "default",

"primary": "172.19.0.11:3306",

"ssl": "REQUIRED",

"status": "OK",

"statusText": "Cluster is ONLINE and can tolerate up to ONE failure.",

"topology": {

"172.19.0.11:3306": {

"address": "172.19.0.11:3306",

"mode": "R/W",

"readReplicas": {},

"role": "HA",

"status": "ONLINE",

"transactions": {

"connection": {

"lastHeartbeatTimestamp": "",

"lastQueued": {

"endTimestamp": "2019-04-03 14:26:33.394755",

"immediateCommitTimestamp": "",

"immediateCommitToEndTime": null,

"originalCommitTimestamp": "",

"originalCommitToEndTime": null,

"queueTime": 0.000077,

"startTimestamp": "2019-04-03 14:26:33.394678",

"transaction": "72568575-561c-11e9-914c-0242ac13000b:13"

"receivedHeartbeats": 0,

"receivedTransactionSet": "4a85f6c4-561c-11e9-8401-0242ac13000b:1-12,

72568575-561c-11e9-914c-0242ac13000b:1-65",

"threadId": null

"workers": [

{

"lastApplied": {

"applyTime": 0.022927,

"endTimestamp": "2019-04-03 14:26:33.417643",

"immediateCommitTimestamp": "",

"immediateCommitToEndTime": null,

"originalCommitTimestamp": "",

"originalCommitToEndTime": null,

"retries": 0,

"startTimestamp": "2019-04-03 14:26:33.394716",

"transaction": "72568575-561c-11e9-914c-0242ac13000b:13"

"threadId": 58

}

]

}

"172.19.0.12:3306": {

"address": "172.19.0.12:3306",

"mode": "R/O",

"readReplicas": {},

"role": "HA",

"status": "ONLINE",

"transactions": {

"connection": {

"lastHeartbeatTimestamp": "",

"lastQueued": {

"endTimestamp": "2019-04-03 15:42:30.855989",

"immediateCommitTimestamp": "",

"immediateCommitToEndTime": null,

"originalCommitTimestamp": "2019-04-03 15:42:30.854594",

"originalCommitToEndTime": 0.001395,

"queueTime": 0.000476,

"startTimestamp": "2019-04-03 15:42:30.855513",

"transaction": "72568575-561c-11e9-914c-0242ac13000b:65"

"receivedHeartbeats": 0,

"receivedTransactionSet": "4a85f6c4-561c-11e9-8401-0242ac13000b:1-12,

72568575-561c-11e9-914c-0242ac13000b:1-65",

"threadId": null

"workers": [

{

"lastApplied": {

"applyTime": 0.024685,

"endTimestamp": "2019-04-03 15:42:30.880361",

"immediateCommitTimestamp": "",

"immediateCommitToEndTime": null,

"originalCommitTimestamp": "2019-04-03 15:42:30.854594",

"originalCommitToEndTime": 0.025767,

"retries": 0,

"startTimestamp": "2019-04-03 15:42:30.855676",

"transaction": "72568575-561c-11e9-914c-0242ac13000b:65"

"threadId": 54

}

]

}

"172.19.0.13:3306": {

"address": "172.19.0.13:3306",

"mode": "R/O",

"readReplicas": {},

"role": "HA",

"status": "ONLINE",

"transactions": {

"connection": {

"lastHeartbeatTimestamp": "",

"lastQueued": {

"endTimestamp": "2019-04-03 15:42:30.855678",

"immediateCommitTimestamp": "",

"immediateCommitToEndTime": null,

"originalCommitTimestamp": "2019-04-03 15:42:30.854594",

"originalCommitToEndTime": 0.001084,

"queueTime": 0.000171,

"startTimestamp": "2019-04-03 15:42:30.855507",

"transaction": "72568575-561c-11e9-914c-0242ac13000b:65"

"receivedHeartbeats": 0,

"receivedTransactionSet": "4a85f6c4-561c-11e9-8401-0242ac13000b:1-12,

72568575-561c-11e9-914c-0242ac13000b:1-65",

"threadId": null

"workers": [

{

"lastApplied": {

"applyTime": 0.021354,

"endTimestamp": "2019-04-03 15:42:30.877398",

"immediateCommitTimestamp": "",

"immediateCommitToEndTime": null,

"originalCommitTimestamp": "2019-04-03 15:42:30.854594",

"originalCommitToEndTime": 0.022804,

"retries": 0,

"startTimestamp": "2019-04-03 15:42:30.856044",

"transaction": "72568575-561c-11e9-914c-0242ac13000b:65"

"threadId": 54

}

]

}

"topologyMode": "Single-Primary"

"groupInformationSourceMember": "172.19.0.11:3306"

}

To summarize

Q: How do I monitor the status & the configuration of my cluster?

A: Use status() or status({extended:true}) or status({queryMembers:true})

References

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Group Replication, High Availability, MySQL by Olivier DASINI

5 Responses to “MySQL InnoDB Cluster – HowTo #1 – Monitor your cluster”

lefred

April 11th, 2019 at 11:14

or both at the same time 😉

cluster.status({extended:true,queryMembers:true})
Olivier DASINI

April 11th, 2019 at 16:39

Indeed!
Thanks for your feedback buddy 🙂
Abdullah Zarour

June 9th, 2019 at 14:40

running cluster.status({extended:true,queryMembers:true})

mysqlsh Ver 8.0.15-commercial for Linux on x86_64 – for MySQL 8.0.15 (MySQL Enterprise Server – Commercial)

output : Error

cluster.status({queryMembers:true})

Cluster.status: get_uint(25): field value out of the allowed range (LogicError)
Olivier DASINI

June 11th, 2019 at 8:50

Thanks for your comment!
Probably related to https://bugs.mysql.com/bug.php?id=95191
We are working on a fix.
Thanks
Déployer 1 cluster MySQL avec 2 commandes | dasini.net - Journal d'un expert MySQL

July 16th, 2019 at 21:03

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