使用 datax 操作 OceanBase

2024年 5月 7日 65.8k 0

作者简介:赵志勇, oracle 、 mysql DBA。

1.    简介

本文简单介绍了 datax 操作 OceanBase 的过程,主要内容为:

1、MySQL 离线同步到 OceanBase。

2、OceanBase 数据写出到 csv 文件。

注:1.本次使用 obproxy ,不使用 obproxy 直连2881端口可能无法成功。

注:2.只提供 datax 操作 OceanBase 的细节部分,datax 的细节请参考 github 的介绍。

2.    环境准备

3.  OceanBase

已准备好一个3节点的 OceanBase 集群(开源3.1.1版本),并建立了业务租户 obcp_t2 。搭建过程及业务租户操作等可参考官方文档或官方入门教程,地址:https://open.oceanbase.com。

如下图,红色方框部分均有相关的搭建过程介绍。

使用 datax 操作 OceanBase-1

3.1.  MySQL

版本8.0.27,搭建过程省略,具体可参见 MySQL 官方文档,详见:https://dev.mysql.com/doc/。

4.    编译datax

由于官方编译好的包不支持 OceanBase 的操作,所以需要从源码进行编译,过程如下:

  # 下载源码
git clone https://github.com/alibaba/datax.git
 
# 安装编译工具maven,linux下可使用yum进行安装
yum install -y maven
 
# 进入到datax源码目录,执行编译:
mvn -U clean package assembly:assembly -Dmaven.test.skip=true
## 如没有报错,生成的编译包在target目录下。
## 为避免生成的包体积太大,可修改pom.xml文件删除一些不需要的reader、writer。
参考more pom.xml(截取一部分)
 
<modules>
       <module>common</module>
       <module>core</module>
       <module>transformer</module>
 
       <!-- reader -->
       <module>mysqlreader</module>
       <module>txtfilereader</module>
       <module>streamreader</module>
       <module>oceanbasev10reader</module>
 
       <!-- writer -->
       <module>mysqlwriter</module>
       <module>txtfilewriter</module>
       <module>ftpwriter</module>
       <module>streamwriter</module>
       <module>oceanbasev10writer</module>
       <!-- common support module -->
       <module>plugin-rdbms-util</module>
       <module>plugin-unstructured-storage-util</module>
</modules>
	 

5.  MySQL离线同步到OceanBase

5.1.    json 配置文件

说明:

oceanbasev10writer :"jdbcUrl": "||_dsc_ob10_dsc_||obcp_test:obcp_t2||_dsc_ob10_dsc_||jdbc:oceanbase://172.20.0.30:2883/tpcc?useLocalSessionState=true&allowBatch=true&allowMultiQueries=true&rewriteBatchedStatements=true",

其中 obcp_test 为集群名,obcp_t2 为业务租户名,tpcc 为库名,2883为 obproxy 的端口。

  more mysql2ob.json 
{
   "job": {
       "setting": {
           "speed": {
               "channel": 4 
           },
           "errorLimit": {
               "record": 0,
               "percentage": 0.1
           }
       },
       "content": [
           {
               "reader": {
                   "name": "mysqlreader",
                   "parameter": {
                       "username": "root",
                       "password": "oracle_4U",
                       "column": [
                           "*"
                       ],
                       "connection": [
                           {
                               "table": [
                                   "customer"
                               ],
                               "jdbcUrl": ["jdbc:mysql://127.0.0.1:3306/tpcc?useUnicode=true&characterEncoding=utf8&useSSL=false"]
                           }
                       ]
                   }
               },
 
               "writer": {
                   "name": "oceanbasev10writer",
                   "parameter": {
                       "obWriteMode": "insert",
                       "column": [
                           "*"
                       ],
                       "preSql": [
                           "truncate table customer"
                       ],
                       "connection": [
                           {
                               "jdbcUrl": "||_dsc_ob10_dsc_||obcp_test:obcp_t2||_dsc_ob10_dsc_||jdbc:oceanbase://172.20.0.30:2883/tpcc?useLocalSession
State=true&allowBatch=true&allowMultiQueries=true&rewriteBatchedStatements=true",
                               "table": [
                                   "customer"
                               ]
                           }
                       ],
                       "username": "root",
                       "password": "oracle_4U",
                       "writerThreadCount":10,
                       "batchSize": 1000,
                       "memstoreThreshold": "0.9"
                   }
               }
           }
       ]
   }
}

5.2.    执行同步

python bin/datax.py mysql2ob.json
 
DataX (DATAX-OPENSOURCE-3.0), From Alibaba !
Copyright (C) 2010-2017, Alibaba Group. All Rights Reserved.
 
 
2021-12-26 09:53:27.305 [main] INFO VMInfo - VMInfo# operatingSystem class => sun.management.OperatingSystemImpl
2021-12-26 09:53:27.317 [main] INFO Engine - the machine info => 
 
      osInfo:  Oracle Corporation 1.8 25.231-b11
      jvmInfo: Linux amd64 3.10.0-1062.9.1.el7.x86_64
      cpu num:     24
 
      totalPhysicalMemory: -0.00G
      freePhysicalMemory: -0.00G
      maxFileDescriptorCount:   -1
      currentOpenFileDescriptorCount:    -1
 
      GC Names   [PS MarkSweep, PS Scavenge]
 
      MEMORY_NAME                   | allocation_size               | init_size                     
      PS Eden Space                 | 256.00MB                      | 256.00MB                      
      Code Cache                    | 240.00MB                      | 2.44MB                        
      Compressed Class Space        | 1,024.00MB                    | 0.00MB                        
      PS Survivor Space             | 42.50MB                       | 42.50MB                       
      PS Old Gen                    | 683.00MB                      | 683.00MB                      
      Metaspace                     | -0.00MB                       | 0.00MB                        
 
 
2021-12-26 09:53:27.342 [main] INFO Engine - 
{
      "content":[
             {
                    "reader":{
                           "name":"mysqlreader",
                           "parameter":{
                                  "column":[
                                         "*"
                                  ],
                                  "connection":[
                                         {
                                                "jdbcUrl":[
                                                       "jdbc:mysql://127.0.0.1:3306/tpcc?useUnicode=true&characterEncoding=utf8&useSSL=false"
                                                ],
                                                "table":[
                                                       "customer"
                                                ]
                                         }
                                  ],
                                  "password":"*********",
                                  "username":"root"
                           }
                    },
                    "writer":{
                           "name":"oceanbasev10writer",
                           "parameter":{
                                  "batchSize":1000,
                                  "column":[
                                         "*"
                                  ],
                                  "connection":[
                                         {
                                                "jdbcUrl":"||_dsc_ob10_dsc_||obcp_test:obcp_t2||_dsc_ob10_dsc_||jdbc:oceanbase://172.20.0.30:2883/tpcc?useLocalSessionState=true&allowBatch=true&allowMultiQueries=true&rewriteBatchedStatements=true",
                                                "table":[
                                                       "customer"
                                                ]
                                         }
                                  ],
                                  "memstoreThreshold":"0.9",
                                  "obWriteMode":"insert",
                                  "password":"*********",
                                  "preSql":[
                                         "truncate table customer"
                                  ],
                                  "username":"root",
                                  "writerThreadCount":10
                           }
                    }
             }
      ],
      "setting":{
             "errorLimit":{
                    "percentage":0.1,
                    "record":0
             },
             "speed":{
                    "channel":4
             }
      }
}
 
2021-12-26 09:53:27.369 [main] WARN Engine - prioriy set to 0, because NumberFormatException, the value is: null
2021-12-26 09:53:27.372 [main] INFO PerfTrace - PerfTrace traceId=job_-1, isEnable=false, priority=0
2021-12-26 09:53:27.372 [main] INFO JobContainer - DataX jobContainer starts job.
2021-12-26 09:53:27.376 [main] INFO JobContainer - Set jobId = 0
2021-12-26 09:53:27.920 [job-0] INFO OriginalConfPretreatmentUtil - Available jdbcUrl:jdbc:mysql://127.0.0.1:3306/tpcc?useUnicode=true&characterEncoding=utf8&useSSL=false&yearIsDateType=false&zeroDateTimeBehavior=convertToNull&tinyInt1isBit=false&rewriteBatchedStatements=true.
2021-12-26 09:53:27.921 [job-0] WARN OriginalConfPretreatmentUtil - 您的配置文件中的列配置存在一定的风险. 因为您未配置读取数据库表的列,当您的表字段个数、类型有变动时,可能影响任务正确性甚至会运行出错。请检查您的配置并作出修改.
2021-12-26 09:53:27.957 [job-0] INFO DBUtil - this is ob1_0 jdbc url.
2021-12-26 09:53:27.958 [job-0] INFO DBUtil - this is ob1_0 jdbc url. user=obcp_test:obcp_t2:root :url=jdbc:oceanbase://172.20.0.30:2883/tpcc?useLocalSessionState=true&allowBatch=true&allowMultiQueries=true&rewriteBatchedStatements=true
2021-12-26 09:53:28.551 [job-0] INFO DbUtils - value for query [SHOW VARIABLES LIKE 'ob_compatibility_mode'] is [MYSQL]
2021-12-26 09:53:28.563 [job-0] INFO DBUtil - this is ob1_0 jdbc url.
2021-12-26 09:53:28.563 [job-0] INFO DBUtil - this is ob1_0 jdbc url. user=obcp_test:obcp_t2:root :url=jdbc:oceanbase://172.20.0.30:2883/tpcc?useLocalSessionState=true&allowBatch=true&allowMultiQueries=true&rewriteBatchedStatements=true&yearIsDateType=false&zeroDateTimeBehavior=convertToNull&tinyInt1isBit=false&rewriteBatchedStatements=true
2021-12-26 09:53:29.143 [job-0] INFO OriginalConfPretreatmentUtil - table:[customer] all columns:[
c_id,c_d_id,c_w_id,c_first,c_middle,c_last,c_street_1,c_street_2,c_city,c_state,c_zip,c_phone,c_since,c_credit,c_credit_lim,c_discount,c_balance,c_ytd_payment,c_payment_cnt,c_delivery_cnt,c_data
].
2021-12-26 09:53:29.144 [job-0] WARN OriginalConfPretreatmentUtil - 您的配置文件中的列配置信息存在风险. 因为您配置的写入数据库表的列为*,当您的表字段个数、类型有变动时,可能影响任务正确性甚至会运行出错。请检查您的配置并作出修改.
2021-12-26 09:53:29.153 [job-0] INFO OriginalConfPretreatmentUtil - Write data [
INSERT INTO %s (c_id,c_d_id,c_w_id,c_first,c_middle,c_last,c_street_1,c_street_2,c_city,c_state,c_zip,c_phone,c_since,c_credit,c_credit_lim,c_discount,c_balance,c_ytd_payment,c_payment_cnt,c_delivery_cnt,c_data) VALUES(?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)
], which jdbcUrl like:[||_dsc_ob10_dsc_||obcp_test:obcp_t2||_dsc_ob10_dsc_||jdbc:oceanbase://172.20.0.30:2883/tpcc?useLocalSessionState=true&allowBatch=true&allowMultiQueries=true&rewriteBatchedStatements=true&yearIsDateType=false&zeroDateTimeBehavior=convertToNull&tinyInt1isBit=false&rewriteBatchedStatements=true]
2021-12-26 09:53:29.154 [job-0] INFO JobContainer - jobContainer starts to do prepare ...
2021-12-26 09:53:29.155 [job-0] INFO JobContainer - DataX Reader.Job [mysqlreader] do prepare work .
2021-12-26 09:53:29.156 [job-0] INFO JobContainer - DataX Writer.Job [oceanbasev10writer] do prepare work .
2021-12-26 09:53:29.157 [job-0] INFO DBUtil - this is ob1_0 jdbc url.
2021-12-26 09:53:29.157 [job-0] INFO DBUtil - this is ob1_0 jdbc url. user=obcp_test:obcp_t2:root :url=jdbc:oceanbase://172.20.0.30:2883/tpcc?useLocalSessionState=true&allowBatch=true&allowMultiQueries=true&rewriteBatchedStatements=true&yearIsDateType=false&zeroDateTimeBehavior=convertToNull&tinyInt1isBit=false&rewriteBatchedStatements=true
2021-12-26 09:53:29.225 [job-0] INFO CommonRdbmsWriter$Job - Begin to execute preSqls:[truncate table customer]. context info:||_dsc_ob10_dsc_||obcp_test:obcp_t2||_dsc_ob10_dsc_||jdbc:oceanbase://172.20.0.30:2883/tpcc?useLocalSessionState=true&allowBatch=true&allowMultiQueries=true&rewriteBatchedStatements=true&yearIsDateType=false&zeroDateTimeBehavior=convertToNull&tinyInt1isBit=false&rewriteBatchedStatements=true.
2021-12-26 09:53:29.785 [job-0] INFO DBUtil - this is ob1_0 jdbc url.
2021-12-26 09:53:29.786 [job-0] INFO DBUtil - this is ob1_0 jdbc url. user=obcp_test:obcp_t2:root :url=jdbc:oceanbase://172.20.0.30:2883/tpcc?useLocalSessionState=true&allowBatch=true&allowMultiQueries=true&rewriteBatchedStatements=true&yearIsDateType=false&zeroDateTimeBehavior=convertToNull&tinyInt1isBit=false&rewriteBatchedStatements=true
2021-12-26 09:53:29.873 [job-0] INFO DbUtils - value for query [show variables like 'version'] is [3.1.1]
2021-12-26 09:53:29.874 [job-0] INFO JobContainer - jobContainer starts to do split ...
2021-12-26 09:53:29.875 [job-0] INFO JobContainer - Job set Channel-Number to 4 channels.
2021-12-26 09:53:29.880 [job-0] INFO JobContainer - DataX Reader.Job [mysqlreader] splits to [1] tasks.
2021-12-26 09:53:29.882 [job-0] INFO JobContainer - DataX Writer.Job [oceanbasev10writer] splits to [1] tasks.
2021-12-26 09:53:29.928 [job-0] INFO JobContainer - jobContainer starts to do schedule ...
2021-12-26 09:53:29.934 [job-0] INFO JobContainer - Scheduler starts [1] taskGroups.
2021-12-26 09:53:29.937 [job-0] INFO JobContainer - Running by standalone Mode.
2021-12-26 09:53:29.946 [taskGroup-0] INFO TaskGroupContainer - taskGroupId=[0] start [1] channels for [1] tasks.
2021-12-26 09:53:30.052 [taskGroup-0] INFO Channel - Channel set byte_speed_limit to -1, No bps activated.
2021-12-26 09:53:30.053 [taskGroup-0] INFO Channel - Channel set record_speed_limit to -1, No tps activated.
2021-12-26 09:53:30.084 [taskGroup-0] INFO TaskGroupContainer - taskGroup[0] taskId[0] attemptCount[1] is started
2021-12-26 09:53:30.087 [0-0-0-writer] INFO OceanBaseV10Writer$Task - tableNumber:1,writerTask Class:com.alibaba.datax.plugin.writer.oceanbasev10writer.task.ConcurrentTableWriterTask
2021-12-26 09:53:30.089 [0-0-0-writer] INFO ConcurrentTableWriterTask - configure url is unavailable, use obclient for connections.
2021-12-26 09:53:30.089 [0-0-0-reader] INFO CommonRdbmsReader$Task - Begin to read record by Sql: [select * from customer 
] jdbcUrl:[jdbc:mysql://127.0.0.1:3306/tpcc?useUnicode=true&characterEncoding=utf8&useSSL=false&yearIsDateType=false&zeroDateTimeBehavior=convertToNull&tinyInt1isBit=false&rewriteBatchedStatements=true].
2021-12-26 09:53:30.171 [0-0-0-writer] INFO ConcurrentTableWriterTask - Disable partition calculation feature.
2021-12-26 09:53:30.370 [0-0-0-writer] INFO CommonRdbmsWriter$Task - write mode: insert
2021-12-26 09:53:30.371 [0-0-0-writer] INFO ConcurrentTableWriterTask - writeRecordSql :INSERT INTO customer (c_id,c_d_id,c_w_id,c_first,c_middle,c_last,c_street_1,c_street_2,c_city,c_state,c_zip,c_phone,c_since,c_credit,c_credit_lim,c_discount,c_balance,c_ytd_payment,c_payment_cnt,c_delivery_cnt,c_data) VALUES(?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)
2021-12-26 09:53:30.372 [0-0-0-writer] INFO DBUtil - this is ob1_0 jdbc url.
2021-12-26 09:53:30.372 [0-0-0-writer] INFO DBUtil - this is ob1_0 jdbc url. user=obcp_test:obcp_t2:root :url=jdbc:oceanbase://172.20.0.30:2883/tpcc?useLocalSessionState=true&allowBatch=true&allowMultiQueries=true&rewriteBatchedStatements=true&yearIsDateType=false&zeroDateTimeBehavior=convertToNull&tinyInt1isBit=false&rewriteBatchedStatements=true
2021-12-26 09:53:30.402 [0-0-0-writer] ERROR ConcurrentTableWriterTask - partCalculator is null
2021-12-26 09:53:30.402 [0-0-0-writer] INFO ConcurrentTableWriterTask - start 1 insert task.
2021-12-26 09:53:30.459 [0-0-0-writer] INFO ConcurrentTableWriterTask - start 2 insert task.
2021-12-26 09:53:30.502 [0-0-0-writer] INFO ConcurrentTableWriterTask - start 3 insert task.
2021-12-26 09:53:30.523 [0-0-0-writer] INFO ConcurrentTableWriterTask - start 4 insert task.
2021-12-26 09:53:30.543 [0-0-0-writer] INFO ConcurrentTableWriterTask - start 5 insert task.
2021-12-26 09:53:30.562 [0-0-0-writer] INFO ConcurrentTableWriterTask - start 6 insert task.
2021-12-26 09:53:30.589 [0-0-0-writer] INFO ConcurrentTableWriterTask - start 7 insert task.
2021-12-26 09:53:30.615 [0-0-0-writer] INFO ConcurrentTableWriterTask - start 8 insert task.
2021-12-26 09:53:30.647 [0-0-0-writer] INFO ConcurrentTableWriterTask - start 9 insert task.
2021-12-26 09:53:30.672 [0-0-0-writer] INFO ConcurrentTableWriterTask - start 10 insert task.
2021-12-26 09:53:30.697 [0-0-0-writer] INFO DBUtil - this is ob1_0 jdbc url.
2021-12-26 09:53:30.697 [0-0-0-writer] INFO DBUtil - this is ob1_0 jdbc url. user=obcp_test:obcp_t2:root :url=jdbc:oceanbase://172.20.0.30:2883/tpcc?useLocalSessionState=true&allowBatch=true&allowMultiQueries=true&rewriteBatchedStatements=true&yearIsDateType=false&zeroDateTimeBehavior=convertToNull&tinyInt1isBit=false&rewriteBatchedStatements=true
2021-12-26 09:53:30.768 [0-0-0-writer] INFO ColumnMetaCache - fetch columnMeta of table customer success
2021-12-26 09:53:32.110 [0-0-0-writer] INFO CommonRdbmsWriter$Task - isMemstoreFull=false
2021-12-26 09:53:40.116 [job-0] INFO StandAloneJobContainerCommunicator - Total 0 records, 0 bytes | Speed 0B/s, 0 records/s | Error 0 records, 0 bytes | All Task WaitWriterTime 0.000s | All Task WaitReaderTime 0.000s | Percentage 0.00%
2021-12-26 09:53:44.968 [0-0-0-reader] INFO CommonRdbmsReader$Task - Finished read record by Sql: [select * from customer 
] jdbcUrl:[jdbc:mysql://127.0.0.1:3306/tpcc?useUnicode=true&characterEncoding=utf8&useSSL=false&yearIsDateType=false&zeroDateTimeBehavior=convertToNull&tinyInt1isBit=false&rewriteBatchedStatements=true].
2021-12-26 09:53:44.991 [0-0-0-writer] INFO ConcurrentTableWriterTask - ConcurrentTableWriter has put all task in queue, queueSize = 0, total = 300, finished = 298
2021-12-26 09:53:45.158 [taskGroup-0] INFO TaskGroupContainer - taskGroup[0] taskId[0] is successed, used[15076]ms
2021-12-26 09:53:45.158 [taskGroup-0] INFO TaskGroupContainer - taskGroup[0] completed it's tasks.
2021-12-26 09:53:50.121 [job-0] INFO StandAloneJobContainerCommunicator - Total 300000 records, 160729712 bytes | Speed 15.33MB/s, 30000 records/s | Error 0 records, 0 bytes | All Task WaitWriterTime 10.871s | All Task WaitReaderTime 1.692s | Percentage 100.00%
2021-12-26 09:53:50.121 [job-0] INFO AbstractScheduler - Scheduler accomplished all tasks.
2021-12-26 09:53:50.122 [job-0] INFO JobContainer - DataX Writer.Job [oceanbasev10writer] do post work.
2021-12-26 09:53:50.122 [job-0] INFO JobContainer - DataX Reader.Job [mysqlreader] do post work.
2021-12-26 09:53:50.122 [job-0] INFO JobContainer - DataX jobId [0] completed successfully.
2021-12-26 09:53:50.124 [job-0] INFO HookInvoker - No hook invoked, because base dir not exists or is a file: /data/obdata/datax/target/datax/datax/hook
2021-12-26 09:53:50.125 [job-0] INFO JobContainer - 
       [total cpu info] => 
             averageCpu                    | maxDeltaCpu                   | minDeltaCpu                   
             -1.00%                        | -1.00%                        | -1.00%
                       
 
       [total gc info] => 
              NAME                | totalGCCount      | maxDeltaGCCount   | minDeltaGCCount   | totalGCTime       | maxDeltaGCTime    | minDeltaGCTime    
              PS MarkSweep        | 0                 | 0                 | 0                 | 0.000s            | 0.000s            | 0.000s            
              PS Scavenge         | 20                | 20                | 20                | 0.383s            | 0.383s            | 0.383s            
 
2021-12-26 09:53:50.125 [job-0] INFO JobContainer - PerfTrace not enable!
2021-12-26 09:53:50.125 [job-0] INFO StandAloneJobContainerCommunicator - Total 300000 records, 160729712 bytes | Speed 7.66MB/s, 15000 records/s | Error 0 records, 0 bytes | All Task WaitWriterTime 10.871s | All Task WaitReaderTime 1.692s | Percentage 100.00%
2021-12-26 09:53:50.126 [job-0] INFO JobContainer - 
任务启动时刻                   : 2021-12-26 09:53:27
任务结束时刻                   : 2021-12-26 09:53:50
任务总计耗时                   :                22s
任务平均流量                   :           7.66MB/s
记录写入速度                   :         15000rec/s
读出记录总数                   :             300000
读写失败总数                   :                  0

5.3.    验证

6. OceanBase 到 CSV

6.1.    json配置文件

{
   "job": {
       "setting": {
           "speed": {
               "channel":3
           },
           "errorLimit": {
               "record": 0
           }
       },
       "content": [
           {
               "reader": {
                   "name": "oceanbasev10reader",
                   "parameter": {
                       "username": "root",
                       "password": "oracle_4U",
                       "column": [
                           "*"
                           ],
                       "weakRead": "false",
                       "readBatchSize": 30,
                       "connection": [
                           {
                               "jdbcUrl": ["||_dsc_ob10_dsc_||obcp_test:obcp_t2||_dsc_ob10_dsc_||jdbc:oceanbase://172.20.0.30:2883/tpcc"],
                               "table": [
                                    "customer"
                               ]
                           }
                       ]
                   }
               },
                "writer": {
                   "name": "txtfilewriter",
                   "parameter": {
                       "path": "/home/admin/",
                       "fileName": "txtfile",
                       "writeMode": "truncate",
                       "format": "yyyy-MM-dd"
                   }
                            }
           }
       ]
   }
}

6.2.    执行同步

python bin/datax.py ob2txt.json

7.  感想

1、OceanBase 可以与 datax 很好的结合,完成异构平台数据的迁入和迁出

2、配置过程中最核心的部分是 jdbcUrl 的配置,主要包括集群名,租户名,数据库名,端口(2883)等。

3、如需更灵活的应用,可结合 datax 的各种参数来实现。

OceanBase 社区版入门到实战教程直播正在进行中~

快和小伙伴一起进群交流学习吧~

加入直播群方式一:

钉钉群号 3582 5151

加入直播群方式二:

扫码下方二维码加入

使用 datax 操作 OceanBase-2

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