Application Example

This section describes how to use cURL to call CDM APIs to migrate data from a local MySQL database to DWS in the cloud.

Obtaining a Token
Call the API to obtain the user token, which will be put into the request header for authentication in a subsequent request.
Creating a CDM Cluster
- If you have created a CDM cluster, skip this step and directly use the ID of the created cluster.
- If you want to use a new cluster for migration, call the API in Creating a Cluster to create a CDM cluster.
Creating Links
Call the API in Creating a Link to create the MySQL and DWS links.
Creating a Migration Job
Call the API in Creating a Job in a Specified Cluster to create a job for migrating data from MySQL to DWS.
Viewing Job Result
Call the API in Querying Job Status to execute the job.

Preparing Data

Before calling an API, prepare the following data.

**Table 1** Preparing data
Item	Name	Description	Example
Account information	Project name	Name of the project where CDM resides	Project Name
	Project ID	ID of the project where CDM resides	1551c7f6c808414d8e9f3c514a170f2e
	Account name	Name of an enterprise account to which a user belongs	Account Name
	Username	Username for using a cloud service. The user must have operation permissions on CDM.	Username
	Password	User password	password
VPC information	VPC ID	The VPC where CDM resides must be the same as that of DWS.	6b47302a-bf79-4b20-bf7a-80987408e196
	Subnet ID	The subnet where CDM resides must be the same as that of DWS.	63bdc3cb-a4e7-486f-82ee-d9bf208c8f8c
	Security group ID	The security group where CDM resides must be the same as that of DWS.	005af77a-cce5-45ac-99c7-2ea50ea8addf
Endpoint	IAM endpoint	An endpoint is the request address for calling an API. Endpoints vary depending on services and regions. You can obtain endpoints from Obtaining an Endpoint.	iam_endpoint
Endpoint	CDM endpoint		cdm_endpoint
MySQL database	IP address	IP address of the local MySQL database, which allows CDM to access the MySQL database using a public IP address	1xx.120.85.24
	Port	MySQL database port	3306
	Database name	Name of the MySQL database from which data is to be exported	DB_name
	Username	Username for accessing the MySQL database. The user must have the read, write, and delete permissions on the MySQL database.	username
	Password	Password for accessing the MySQL database	DB_password
DWS database	IP address	IP address of the DWS database. CDM can access the IP address through the internal network.	10.120.85.24
	Port	DWS database port	3306
	Database name	Name of the DWS database to which data is written	DWS
	Username	Username for accessing the DWS database. The user must have the read, write, and delete permissions on the DWS database.	user_dws
	Password	Password for accessing the DWS database	dws_password

Obtaining a Token

Before calling other APIs, obtain the token and set it as an environment variable.

curl -H "Content-Type:application/json" https://{iam_endpoint}/v3/auth/tokens -X POST -d '
{
    "auth": {
        "identity": {
            "methods": [
                "password"
            ],
            "password": {
                "user": {
                    "name": "Username",
                    "password": "password",
                    "domain": {
                        "name": "Account Name"
                    }
                }
            }
        },
        "scope": {
            "project": {
                "id": "1551c7f6c808414d8e9f3c514a170f2e"
            }
        }
    }
}
' -v -k

The value of X-Subject-Token in the response header is the token.

X-Subject-Token:MIIDkgYJKoZIhvcNAQcCoIIDgzCCA38CAQExDTALBglghkgBZQMEAgEwgXXXXX...

Run the following command to set the token as an environment variable for future use:

export X-Auth-Token = MIIDkgYJKoZIhvcNAQcCoIIDgzCCA38CAQExDTALBglghkgBZQMEAgEwgXXXXX...

Creating a CDM Cluster

Call the API in Creating a Cluster to create a cluster. The following values are examples:

Cluster name: cdm-ab82
Cluster flavor: cdm.medium
The VPC, subnet, and security group are the same as those of DWS, and the EIP is automatically bound.

If status code 200 is returned, the cluster is successfully created.

curl -X POST -H 'Content-Type:application/json;charset=utf-8' -H "X-Auth-Token:$Token" -d '
{
  "cluster": {
    "name": "cdm-ab82",
    "vpcId": "6b47302a-bf79-4b20-bf7a-80987408e196", 
    "instances": [{
            "flavorRef": "fb8fe666-6734-4b11-bc6c-43d11db3c745",
            "nics": [{
                "net-id": "63bdc3cb-a4e7-486f-82ee-d9bf208c8f8c",
                "securityGroupId": "005af77a-cce5-45ac-99c7-2ea50ea8addf"
            }],
            "availability_zone": "Project Name",
            "type": "cdm"
        }],
    "datastore": {
            "version": "1.8.5",
            "type": "cdm"
        },
    "isScheduleBootOff": false,
    "scheduleBootTime": "null",
    "scheduleOffTime": "null",
    "isAutoOff": false,
    "sys_tags": [{
            "key": "_sys_enterprise_project_id",
            "value": "1ce45885-4033-40d2-bdde-d4dbaceb387d"
        }]
    },
  "autoRemind": false,
  "phoneNum": "null",
  "email": "null"
}' 
https://{cdm_endpoint}/v1.1/1551c7f6c808414d8e9f3c514a170f2e/clusters -v -k

Call the API in Querying the Cluster List to query cluster information, obtain the cluster ID, and set the cluster ID to a global variable.

curl -X GET -H 'Content-Type:application/json;charset=utf-8' -H "X-Auth-Token:$Token" https://{cdm_endpoint}/v1.1/1551c7f6c808414d8e9f3c514a170f2e/clusters -k -v

The response is as follows:

{
  "clusters": [{
    "version": "x.x.x",
    "updated": "2018-09-05T08:38:25",
    "name": "cdm-ab82",
    "created": "2018-09-05T08:38:25",
    "id": "bae65496-643e-47ca-84af-948672de7eeb",
    "status": "200",
    "isFrozen": "0",
    "statusDetail": "Normal",
    "actionProgress": {},
    "config_status": "In-Sync"
  }]
}

If the value of status is 200, the cluster is successfully created. The cluster ID is bae65496-643e-47ca-84af-948672de7eeb.

Run the following command to set the cluster ID to a global variable for future use:
```
export ID = bae65496-643e-47ca-84af-948672de7eeb
```

Creating Links

Call the API in Creating a Link to create the MySQL link mysql_link. The following values are examples:

IP address: 1xx.120.85.24
Port number: 3306
Database name: DB_name
Login username: username
Password: DB_password

If status code 200 is returned, the link is successfully created.

curl -X POST -H "Content-Type:application/json" -H "X-Auth-Token:$Token" -d '{
  "links": [{
    "enabled": true,
    "update-user": null,
    "name": "mysql_link",
    "link-config-values": {
      "configs": [
                    {
                        "name": "linkConfig",
                        "inputs": [
                            {
                                "name": "linkConfig.databaseType",
                                "value": "MYSQL"
                            },
                            {
                                "name": "linkConfig.host",
                                "value": "1xx.120.85.24"
                            },
                            {
                                "name": "linkConfig.port",
                                "value": "3306"
                            },
                            {
                                "name": "linkConfig.database",
                                "value": "DB_name"
                            },
                            {
                                "name": "linkConfig.username",
                                "value": "username"
                            },
                            {
                                "name": "linkConfig.password",
                                "value": "DB_password"
                            },
                            {
                                "name": "linkConfig.fetchSize",
                                "value": "100000"
                            },
                            {
                                "name": "linkConfig.usingNative",
                                "value": "true"
                            }
                        ]
                    }
                ]
    },
    "connector-name": "generic-jdbc-connector",
    "creation-date": 1536654788622,
    "update-date": 1536654788622,
    "creation-user": null
  }]
}' 
https://{cdm_endpoint}/v1.1/1551c7f6c808414d8e9f3c514a170f2e/clusters/bae65496-643e-47ca-84af-948672de7eeb/cdm/link -k -v

Call the API in Creating a Link to create the DWS link dws_link. The following values are examples:

IP address of the database: 10.120.85.24
Port number: 3306
Database name: DWS
Login username: user_dws
Password: dws_password

curl -X POST -H "Content-Type:application/json" -H "X-Auth-Token:$Token" -d '{
  "links": [{
    "enabled": true,
    "update-user": null,
    "name": "dws_link",
    "link-config-values": {
      "configs": [
                    {
                        "name": "linkConfig",
                        "inputs": [
                            {
                                "name": "linkConfig.databaseType",
                                "value": "DWS"
                            },
                            {
                                "name": "linkConfig.host",
                                "value": "10.120.85.24"
                            },
                            {
                                "name": "linkConfig.port",
                                "value": "3306"
                            },
                            {
                                "name": "linkConfig.database",
                                "value": "DWS"
                            },
                            {
                                "name": "linkConfig.username",
                                "value": "user_dws"
                            },
                            {
                                "name": "linkConfig.password",
                                "value": "dws_password"
                            },
                            {
                                "name": "linkConfig.fetchSize",
                                "value": "100000"
                            },
                            {
                                "name": "linkConfig.usingNative",
                                "value": "true"
                            }
                        ]
                    }
                ]
    },
    "connector-name": "generic-jdbc-connector",
    "creation-date": 1536654788622,
    "update-date": 1536654788622,
    "creation-user": null
  }]
}' 
https://{cdm_endpoint}/v1.1/1551c7f6c808414d8e9f3c514a170f2e/clusters/bae65496-643e-47ca-84af-948672de7eeb/cdm/link -k -v

Creating a Migration Job

After the links are created, call the API in Creating a Job in a Specified Cluster to create a migration job. The following is a sample job:

The job name is mysql2dws.
The name of the MySQL database from which data is exported is default, and the name of the exported table is mysql_tbl. The job is split into multiple tasks by id and the tasks are executed concurrently.
The name of the database on DWS to which the data is imported is public, and the table name is cdm_all_type. Do not clear the data in the table before import.
If no table in the local MySQL database exists in the database on DWS, CDM automatically creates the table on DWS.
The field list loaded to DWS is id&gid&name.
When the job extracts data, three extractors are concurrently executed.

If status code 200 is returned, the job is successfully created.

curl -X POST -H "Content-Type:application/json" -H "X-Cluster-ID:$ID" -H "X-Auth-Token:$Token" -d '{
  "jobs": [{
    "job_type": "NORMAL_JOB",
    "name": "mysql2dws",
    "from-link-name": "mysql_link",
    "from-connector-name": "generic-jdbc-connector",
    "to-link-name": "dws_link",
    "to-connector-name": "generic-jdbc-connector",
    "from-config-values": {
      "configs": [{
        "name": "fromJobConfig",
        "inputs": [{
          "name": "fromJobConfig.schemaName",
          "value": "default"
        },
        {
          "name": "fromJobConfig.tableName",
          "value": "mysql_tbl"
        },
        {
          "name": "fromJobConfig.partitionColumn",
          "value": "id"
        }]
      }]
    },
"to-config-values": {
             "configs": [
                 {
                     "inputs": [
                         {
                             "name": "toJobConfig.schemaName",
                             "value": "public"
                         },
                         {
                             "name": "toJobConfig.tablePreparation",
                             "value": "CREATE_WHEN_NOT_EXIST"
                         },
                         {
                             "name": "toJobConfig.tableName",
                             "value": "cdm_all_type"
                         },
                         {
                             "name": "toJobConfig.columnList",
                             "value": "id&gid&name"
                         },
                         {
                             "name": "toJobConfig.shouldClearTable",
                             "value": "false"
                         }
                     ],
                     "name": "toJobConfig"
                 }
             ]
         },
    "driver-config-values": {
      "configs": [{
        "name": "throttlingConfig",
        "inputs": [{
          "name": "throttlingConfig.numExtractors",
          "value": "3"
        }]
      }]
    }
  }]
}' https://{cdm_endpoint}/v1.1/1551c7f6c808414d8e9f3c514a170f2e/clusters/bae65496-643e-47ca-84af-948672de7eeb/cdm/job -k -v

Call the API in Starting a Job to execute the job.

curl -X GET -H 'Content-Type:application/json;charset=utf-8' -H "X-Cluster-ID:$ID" -H "X-Auth-Token:$Token" https://{cdm_endpoint}/v1.1/1551c7f6c808414d8e9f3c514a170f2e/clusters/bae65496-643e-47ca-84af-948672de7eeb/cdm/job/mysql2dws/start -k -v

The response is as follows:

{
  "submissions": [{
    "progress": 1,
    "job-name": "mysql2dws",
    "status": "BOOTING",
    "creation-date": 1536654788622,
    "creation-user": "cdm"
  }]
}

Viewing Job Result

Call the API in Querying Job Status to query the job status.

curl -X GET -H 'Content-Type:application/json;charset=utf-8' -H "X-Cluster-ID:$ID" -H "X-Auth-Token:$Token" https://{cdm_endpoint}/v1.1/1551c7f6c808414d8e9f3c514a170f2e/clusters/6ec9a0a4-76be-4262-8697-e7af1fac7920/cdm/job/mysql2dws/status -k -v

View the job execution result. The response to successful job execution is as follows:

{
  "submissions": [{
    "progress": 0,
    "job-name": "mysql2dws",
    "status": "SUCCEEDED",
    "creation-date": 1536654788622,
    "creation-user": "cdm",
    "isStopingIncrement": "",
    "last-update-date": 1536654888622,
    "is-execute-auto": false,
    "last-udpate-user": "cdm",
    "isDeleteJob": false,
    "isIncrementing": false,
    "external-id": "job_local1127970451_0009",
    "counters": {
      "org.apache.sqoop.submission.counter.SqoopCounters": {
        "BYTES_WRITTEN": -1,
        "TOTAL_FILES": -1,
        "BYTES_READ": -1,
        "FILES_WRITTEN": -1,
        "TOTAL_SIZE": -1,
        "FILES_READ": -1,
        "ROWS_WRITTEN": 80,
        "ROWS_READ": 80
      }
    }
  }]
}