使用Embulk从Oracle抽取数据到Trafodion

在前面的文章，我们介绍过使用开源工具Kettle可以实现关系型数据库如Oracle到Trafodion的数据抽取工作，本文介绍另外一种ETL工具Embulk。Embulk是一款开源的批量加载工具，可以在多种数据库、存储引擎、文本格式及云服务之间进行数据转换，Embulk官网中的下面这张图比较简单明了的描述出了其特点，

Embulk提供很多plugins，包括Input plugins、Output plugins、File parser plugins等，详细可以参考http://www.embulk.org/plugins/。用户也可以开发自己的plugins并上传，如EsgynDB就基于trafodion自己开发一款基于trafodion的upsert using load实现的批量加载插件，如下图，

本文在此利用上述的trafodion output插件及oracle input插件通过实例描述如何使用embulk实现oracle到trafodion的数据加载。
1 下载安装Embulk

wget https://dl.embulk.org/embulk-latest.jarmkdir ~/.embulk/binmv embulk-latest.jar ~/.embulk/bin/embulkchmod +x ~/.embulk/bin/embulkecho 'export PATH="$HOME/.embulk/bin:$PATH"' >> ~/.bashrcsource ~/.bashrc

2 验证Embulk下载安装成功

[root@n12 ~]# embulk gem list2017-09-05 20:19:51.184 +0800: Embulk v0.8.31*** LOCAL GEMS ***did_you_mean (default: 1.0.1)jar-dependencies (default: 0.3.5)jruby-openssl (0.9.17 java)json (1.8.3 java)minitest (default: 5.4.1)net-telnet (default: 0.1.1)power_assert (default: 0.2.3)psych (2.0.17 java)racc (1.4.14 java)rake (default: 10.4.2)rdoc (default: 4.2.0)test-unit (default: 3.1.1)

3 安装oracle input插件及trafodion output插件

embulk gem install embulk-input-oracleembulk gem install embulk-output-trafodion

4 验证以上插件安装成功

root@n12 ~]# embulk gem list2017-09-05 20:22:57.146 +0800: Embulk v0.8.31*** LOCAL GEMS ***did_you_mean (default: 1.0.1)embulk-input-oracle (0.8.5)embulk-output-trafodion (0.1.1)jar-dependencies (default: 0.3.5)jruby-openssl (0.9.17 java)json (1.8.3 java)minitest (default: 5.4.1)net-telnet (default: 0.1.1)power_assert (default: 0.2.3)psych (2.0.17 java)racc (1.4.14 java)rake (default: 10.4.2)rdoc (default: 4.2.0)test-unit (default: 3.1.1)

5 准备oracle jar包，用于读取oracle数据库

[root@n12 ~]# ll /opt/drivers/total 2676-rw-rw-r-- 1 trafodion trafodion 2739670 Sep  5 20:38 ojdbc6.jar

6 编辑YAML文件oracle_to_trafodion.yml
注：Embulk使用YAML文件来定义数据批量加载的方式，YAML文件格式定义可参考 http://www.embulk.org/docs/built-in.html#embulk-configuration-file-format

exec:  max_threads: 8  min_output_tasks: 4in:  type: oracle  driver_path: /opt/drivers/ojdbc6.jar  url: "jdbc:oracle:thin:@10.10.11.16:1521:esgyn"  user: system  password: system12345  query: |    select * from test_tblout:  type: trafodion  url: "jdbc:t4jdbc://192.168.1.93:23400/:schema=seabase"  user: trafodion  password: traf123  default_timezone: 'Asia/Shanghai'  table: TEST_TBL  mode:  insert_direct

7 创建Oracle测试表并插入测试数据

SQL> create table test_tbl(a char(10),b char(10));SQL> insert into test_tbl values('a','b');SQL> insert into test_tbl values('c','d');SQL> insert into test_tbl values('e','f');SQL> select * from test_tbl;A          B---------- ----------a          bc          de          f

8 创建Trafodion目标表

>>create table test_tbl(a char(10),b char(10));--- SQL operation complete.>>select * from test_tbl;--- 0 row(s) selected.

9 运行Embulk任务

--预览embulk preview ~/oracle_to_trafodion.yml[root@n12 ~]# embulk preview ~/oracle_to_trafodion.yml2017-09-05 20:41:24.093 +0800: Embulk v0.8.312017-09-05 20:41:27.303 +0800 [INFO] (0001:preview): Loaded plugin embulk-input-oracle (0.8.5)2017-09-05 20:41:27.662 +0800 [INFO] (0001:preview): Using JDBC Driver 11.2.0.4.02017-09-05 20:41:27.977 +0800 [INFO] (0001:preview): SQL: select * from test_tbl2017-09-05 20:41:27.999 +0800 [INFO] (0001:preview): > 0.02 seconds+------------+------------+|   A:string |   B:string |+------------+------------+| a          | b          || c          | d          || e          | f          |+------------+------------+--运行embulk run     ~/oracle_to_trafodion.yml[root@n12 ~]# embulk run     ~/oracle_to_trafodion.yml2017-09-05 21:01:26.419 +0800: Embulk v0.8.312017-09-05 21:01:30.260 +0800 [INFO] (0001:transaction): Loaded plugin embulk-input-oracle (0.8.5)2017-09-05 21:01:30.298 +0800 [INFO] (0001:transaction): Loaded plugin embulk-output-trafodion (0.1.1)2017-09-05 21:01:30.807 +0800 [INFO] (0001:transaction): Using JDBC Driver 11.2.0.4.02017-09-05 21:01:30.995 +0800 [INFO] (0001:transaction): Using local thread executor with max_threads=8 / output tasks 4 = input tasks 1 * 4-----------------------------------jdbc:t4jdbc://192.168.1.93:23400/:schema=seabase2017-09-05 21:01:31.019 +0800 [INFO] (0001:transaction): Connecting to jdbc:t4jdbc://192.168.1.93:23400/:schema=seabase options {user=trafodion, tcpKeepAlive=true, useCompression=true, rewriteBatchedStatements=true, connectTimeout=300000, socketTimeout=1800000}connection------------------------------------:org.trafodion.jdbc.t4.TrafT4Connection@1cc41b772017-09-05 21:01:36.271 +0800 [INFO] (0001:transaction): Using insert_direct mode[WARN] Plugin uses deprecated constructor of org.embulk.spi.time.TimestampFormatter.[WARN] Report plugins in your config at: https://github.com/embulk/embulk/issues/7452017-09-05 21:01:40.345 +0800 [INFO] (0001:transaction): {done:  0 / 1, running: 0}-----------------------------------jdbc:t4jdbc://192.168.1.93:23400/:schema=seabase2017-09-05 21:01:40.389 +0800 [INFO] (0026:task-0000): Connecting to jdbc:t4jdbc://192.168.1.93:23400/:schema=seabase options {user=trafodion, tcpKeepAlive=true, useCompression=true, rewriteBatchedStatements=true, connectTimeout=300000, socketTimeout=1800000}connection------------------------------------:org.trafodion.jdbc.t4.TrafT4Connection@4ee9df382017-09-05 21:01:40.970 +0800 [INFO] (0026:task-0000): Prepared SQL: UPSERT USING LOAD INTO "TEST_TBL" ("A", "B") VALUES (?, ?)-----------------------------------jdbc:t4jdbc://192.168.1.93:23400/:schema=seabase2017-09-05 21:01:47.001 +0800 [INFO] (0026:task-0000): Connecting to jdbc:t4jdbc://192.168.1.93:23400/:schema=seabase options {user=trafodion, tcpKeepAlive=true, useCompression=true, rewriteBatchedStatements=true, connectTimeout=300000, socketTimeout=1800000}connection------------------------------------:org.trafodion.jdbc.t4.TrafT4Connection@785aae0e2017-09-05 21:01:52.935 +0800 [INFO] (0026:task-0000): Prepared SQL: UPSERT USING LOAD INTO "TEST_TBL" ("A", "B") VALUES (?, ?)-----------------------------------jdbc:t4jdbc://192.168.1.93:23400/:schema=seabase2017-09-05 21:02:01.036 +0800 [INFO] (0026:task-0000): Connecting to jdbc:t4jdbc://192.168.1.93:23400/:schema=seabase options {user=trafodion, tcpKeepAlive=true, useCompression=true, rewriteBatchedStatements=true, connectTimeout=300000, socketTimeout=1800000}connection------------------------------------:org.trafodion.jdbc.t4.TrafT4Connection@38f4c2382017-09-05 21:02:03.872 +0800 [INFO] (0026:task-0000): Prepared SQL: UPSERT USING LOAD INTO "TEST_TBL" ("A", "B") VALUES (?, ?)-----------------------------------jdbc:t4jdbc://192.168.1.93:23400/:schema=seabase2017-09-05 21:02:10.364 +0800 [INFO] (0026:task-0000): Connecting to jdbc:t4jdbc://192.168.1.93:23400/:schema=seabase options {user=trafodion, tcpKeepAlive=true, useCompression=true, rewriteBatchedStatements=true, connectTimeout=300000, socketTimeout=1800000}connection------------------------------------:org.trafodion.jdbc.t4.TrafT4Connection@6c47ecb42017-09-05 21:02:17.565 +0800 [INFO] (0026:task-0000): Prepared SQL: UPSERT USING LOAD INTO "TEST_TBL" ("A", "B") VALUES (?, ?)2017-09-05 21:02:36.756 +0800 [INFO] (0026:task-0000): SQL: select * from test_tbl2017-09-05 21:02:36.777 +0800 [INFO] (0026:task-0000): > 0.02 seconds2017-09-05 21:02:36.783 +0800 [INFO] (0026:task-0000): Loading 3 rows2017-09-05 21:02:36.821 +0800 [INFO] (0026:task-0000): > 0.04 seconds (loaded 3 rows in total)2017-09-05 21:02:37.653 +0800 [INFO] (0001:transaction): {done:  1 / 1, running: 0}2017-09-05 21:02:37.665 +0800 [INFO] (main): Committed.2017-09-05 21:02:37.665 +0800 [INFO] (main): Next config diff: {"in":{},"out":{}}

10 检查Embulk任务执行成功

SQL>select * from test_tbl;A          B---------- ----------a          bc          de          f--- 3 row(s) selected.

至此，使用Embulk从Oracle抽取数据到Trafodion演示完毕！