ShardingSphere 4.x -Sharding-Scaling(Alpha)

Introduction

Sharding-Scaling is a common solution for migrating data to ShardingSphere or scaling data in ShardingSphere since 4.1.0.

Build&Deployment

1. Execute the following command to compile and generate the sharding-scaling binary package:

git clone https://github.com/apache/shardingsphere.git；
cd shardingsphere;
mvn clean install -Prelease;

The binary package’s directory is:/sharding-distribution/sharding-scaling-distribution/target/apache-shardingsphere-${latest.release.version}-sharding-scaling-bin.tar.gz。

2. Unzip the distribution package, modify the configuration file conf/server.yaml, we should ensure the port does not conflict with others, and other values can be left as default:

port: 8888
blockQueueSize: 10000
pushTimeout: 1000
workerThread: 30

3. start up sharding-scaling:

sh bin/start.sh

4. See the log file logs/stdout.log，ensure startup successfully.

5. Ensure startup successfully by curl.

curl -X GET http://localhost:8888/shardingscaling/job/list

response:

{"success":true,"errorCode":0,"errorMsg":null,"model":[]}

Shutdown Sharding-Scaling

sh bin/stop.sh

# Configuration

The existing configuration items are as follows, We can modify them in conf/server.yaml：

Manual

Environment

JAVA，JDK 1.8+.

The migration scene we support：

Attention: If the backend database is MySQL, download MySQL Connector/J and decompress, then copy mysql-connector-java-5.1.47.jar to ${sharding-scaling}\lib directory.

Privileges

MySQL need to open binlog, and binlog format should be Row model. Privileges of users scaling used should include Replication privileges.

+-----------------------------------------+---------------------------------------+
| Variable_name                           | Value                                 |
+-----------------------------------------+---------------------------------------+
| log_bin                                 | ON                                    |
| binlog_format                           | ROW                                   |
+-----------------------------------------+---------------------------------------+
+------------------------------------------------------------------------------+
|Grants for ${username}@${host}                                                |
+------------------------------------------------------------------------------+
|GRANT REPLICATION SLAVE, REPLICATION CLIENT ON *.* TO ${username}@${host}     |
|.......                                                                       |
+------------------------------------------------------------------------------+

PostgreSQL need to support and open test_decoding feature.

API

Sharding-Scaling provides a simple HTTP API

Start scaling job

Interface description：POST /shardingscaling/job/start

Body：

Example：

curl -X POST \
  http://localhost:8888/shardingscaling/job/start \
  -H 'content-type: application/json' \
  -d '{
   "ruleConfiguration": {
      "sourceDatasource": "ds_0: !!org.apache.shardingsphere.orchestration.yaml.config.YamlDataSourceConfiguration\n  dataSourceClassName: com.zaxxer.hikari.HikariDataSource\n  properties:\n    jdbcUrl: jdbc:mysql://127.0.0.1:3306/test?serverTimezone=UTC&useSSL=false\n    username: root\n    password: '\''123456'\''\n    connectionTimeout: 30000\n    idleTimeout: 60000\n    maxLifetime: 1800000\n    maxPoolSize: 50\n    minPoolSize: 1\n    maintenanceIntervalMilliseconds: 30000\n    readOnly: false\n",
      "sourceRule": "defaultDatabaseStrategy:\n  inline:\n    algorithmExpression: ds_${user_id % 2}\n    shardingColumn: user_id\ntables:\n  t1:\n    actualDataNodes: ds_0.t1\n    keyGenerator:\n      column: order_id\n      type: SNOWFLAKE\n    logicTable: t1\n    tableStrategy:\n      inline:\n        algorithmExpression: t1\n        shardingColumn: order_id\n  t2:\n    actualDataNodes: ds_0.t2\n    keyGenerator:\n      column: order_item_id\n      type: SNOWFLAKE\n    logicTable: t2\n    tableStrategy:\n      inline:\n        algorithmExpression: t2\n        shardingColumn: order_id\n",
      "destinationDataSources": {
         "name": "dt_0",
         "password": "123456",
         "url": "jdbc:mysql://127.0.0.1:3306/test2?serverTimezone=UTC&useSSL=false",
         "username": "root"
      }
   },
   "jobConfiguration": {
      "concurrency": 3
   }
}'

Response：

{
   "success": true,
   "errorCode": 0,
   "errorMsg": null,
   "model": null
}

Get scaling progress

Interface description：GET /shardingscaling/job/progress/{jobId}

Example：

curl -X GET \
  http://localhost:8888/shardingscaling/job/progress/1

Response：

{
   "success": true,
   "errorCode": 0,
   "errorMsg": null,
   "model": {
        "id": 1,
        "jobName": "Local Sharding Scaling Job",
        "status": "RUNNING/STOPPED"
        "syncTaskProgress": [{
            "id": "127.0.0.1-3306-test",
            "status": "PREPARING/MIGRATE_HISTORY_DATA/SYNCHRONIZE_REALTIME_DATA/STOPPING/STOPPED",
            "historySyncTaskProgress": [{
                "id": "history-test-t1#0",
                "estimatedRows": 41147,
                "syncedRows": 41147
            }, {
                "id": "history-test-t1#1",
                "estimatedRows": 42917,
                "syncedRows": 42917
            }, {
                "id": "history-test-t1#2",
                "estimatedRows": 43543,
                "syncedRows": 43543
            }, {
                "id": "history-test-t2#0",
                "estimatedRows": 39679,
                "syncedRows": 39679
            }, {
                "id": "history-test-t2#1",
                "estimatedRows": 41483,
                "syncedRows": 41483
            }, {
                "id": "history-test-t2#2",
                "estimatedRows": 42107,
                "syncedRows": 42107
            }],
            "realTimeSyncTaskProgress": {
                "id": "realtime-test",
                "delayMillisecond": 1576563771372,
                "logPosition": {
                    "filename": "ON.000007",
                    "position": 177532875,
                    "serverId": 0
                }
            }
        }]
   }
}

List scaling jobs

Interface description：GET /shardingscaling/job/list

Example：

curl -X GET \
  http://localhost:8888/shardingscaling/job/list

Response：

{
  "success": true,
  "errorCode": 0,
  "model": [
    {
      "jobId": 1,
      "jobName": "Local Sharding Scaling Job",
      "status": "RUNNING"
    }
  ]
}

Stop scaling job

Interface description：POST /shardingscaling/job/stop

Body：

Example：

curl -X POST \
  http://localhost:8888/shardingscaling/job/stop \
  -H 'content-type: application/json' \
  -d '{
   "jobId":1
}'

Response：

{
   "success": true,
   "errorCode": 0,
   "errorMsg": null,
   "model": null
}

Operate through the UI interface

We provide user interface in sharding-ui, so all the operations related can be implemented with a click of the UI interface. For more information, please refer to the sharding-ui module.