Objective
This tutorial demonstrates how to use the QueryDatabaseTable and PutKudu processors to read data from a MySQL database and put into Kudu. Thanks to @Cam Mach for his assistance with this article.
Note: The PutKudu processor was introduced in NiFi 1.4.0.
Environment
This tutorial was tested using the following environment and components:
Mac OS X 10.11.6
Apache NiFi 1.4.0
Apache Kudu 1.5.0
MySQL 5.7.13
PutKudu (AvroReader)
Demo Configuration
MySQL Setup
Create table
Create the table 'users' In your MySQL instance, choose a database ("nifi_db" in my instance) and create the table "users":
unix> mysql -u root -p
unix> Enter password:
mysql> use nifi_db;
mysql>CREATE TABLE `users` (
`id` mediumint(9) NOT NULL AUTO_INCREMENT,
`title` text,
`first_name` text,
`last_name` text,
`street` text,
`city` text,
`state` text,
`zip` text,
`gender` text,
`email` text,
`username` text,
`password` text,
`phone` text,
`cell` text,
`ssn` text,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=103 DEFAULT CHARSET=latin1;
Insert data
Add data to the "users" table:
mysql>INSERT INTO `users` (`id`, `title`, `first_name`, `last_name`, `street`, `city`, `state`, `zip`, `gender`, `email`, `username`, `password`, `phone`, `cell`, `ssn`)
VALUES (1, 'miss', 'marlene', 'shaw', '3450 w belt line rd', 'abilene', 'florida', '31995', 'F', '[email protected]', 'goldenpanda70', 'naughty', '(176)-908-6931', '(711)-565-2194', '800-71-1872'),
(2, 'ms', 'letitia', 'jordan', '2974 mockingbird hill', 'irvine', 'new jersey', '64361', 'F', '[email protected]', 'lazytiger614', 'aaaaa1', '(860)-602-3314', '(724)-685-3472', '548-93-7031'),
(3, 'mr', 'todd', 'graham', '5760 spring hill rd', 'garden grove', 'north carolina', '81790', 'M', '[email protected]', 'purplekoala484', 'paintball', '(230)-874-6532', '(186)-529-4912', '362-31-5248'),
(4, 'mr', 'seth', 'martinez', '4377 fincher rd', 'chandler', 'south carolina', '73651', 'M', '[email protected]', 'bigbutterfly149', 'navy', '(122)-782-5822', '(720)-778-8541', '200-80-9087'),
(5, 'mr', 'guy', 'mckinney', '4524 hogan st', 'iowa park', 'ohio', '24140', 'M', '[email protected]', 'blueduck623', 'office', '(309)-556-7859', '(856)-764-9146', '973-37-9077'),
(6, 'ms', 'anna', 'smith', '5047 cackson st', 'rancho cucamonga', 'pennsylvania', '56486', 'F', '[email protected]', 'goldenfish121', 'albion', '(335)-388-7351', '(485)-150-6348', '680-20-6440'),
(7, 'mr', 'johnny', 'johnson', '7250 bruce st', 'gresham', 'new mexico', '83973', 'M', '[email protected]', 'crazyduck127', 'toast', '(142)-971-3099', '(991)-131-1582', '683-26-4133'),
(8, 'mrs', 'robin', 'white', '7882 northaven rd', 'orlando', 'connecticut', '40452', 'F', '[email protected]', 'whitetiger371', 'elizabeth', '(311)-659-3812', '(689)-468-6420', '960-70-3399'),
(9, 'miss', 'allison', 'williams', '7648 edwards rd', 'edison', 'louisiana', '52040', 'F', '[email protected]', 'beautifulfish354', 'sanfran', '(328)-592-3520', '(550)-172-4018', '164-78-8160');
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Kudu Setup
Find IP Addr
For my setup, I followed the Apache Kudu Quickstart instructions to easily set up and run a Kudu VM.
To check that your VM is running:
unix> VBoxManage list runningvms"kudu-demo" {b39279b5-3dd6-478a-ac9d-2204bf88e7b9}
To see what IP Kudu is running on:
unix> VBoxManage guestproperty get kudu-demo /VirtualBox/GuestInfo/Net/0/V4/IPValue: 192.168.58.100
The Kudu web client runs on port 8051:
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Create table
Create a table in Kudu by first connecting to Impala in the virtual machine:
ssh [email protected] -t [email protected]'s password:[quickstart.cloudera:21000] >
( Note: The username and password for the Quickstart VM is "demo".)
Create the Kudu table with the same columns and data types as the MySQL table:
CREATE TABLE users_kudu
(
id BIGINT,
title STRING,
first_name STRING,
last_name STRING,
street STRING,
city STRING,
state STRING,
zip STRING,
gender STRING,
email STRING,
username STRING,
password STRING,
cell STRING,
ssn STRING,
PRIMARY KEY(id)
)
PARTITION BY HASH PARTITIONS 16
STORED AS KUDU;
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NiFi Flow Setup
Follow the following detailed instructions to set up the flow. Alternatively, a template of the flow can be downloaded here:putkudu-querydatabasetable.xml
Two Controller Services
Two controller services are needed for the flow. Click the "Configuration" button (gear icon) from the Operate palette:
DBCPConnectionPool
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This opens the NiFi Flow Configuration window. Select the "Controller Services" tab. Click the "+" button and add a DBCPConnectionPool controller service:
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Configure the controller service as follows (adjusting the property values to match your own MySQL instance and environment):
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AvroReader
Next, add an AvroReader controller service:
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Apply the default configuration:
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Select the "lightning bolt" icon for each controller service to enable them:
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QueryDatabaseTable processor:
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Configure the processor as follows:
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where:
The DBCPConnectionPool controller service created earlier is selected for Database Connection Pooling Service
"users" is entered for the Table Name
"id" is entered for the Maximum-value Columns
PutKudu Processor
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Configure the PuKudu processor as follows:
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where:
"192.168.58.100:7051" is entered for the Kudu Masters IP and port (7051 is the default port)
"impala::default.users_kudu" is entered for the Table Name
Skip head line property is set to "false"
The AvroReader controller service created earlier is selected for Record Reader
Auto-terminate the Success relationship:
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On the canvas, make a "failure" relationship connection from the PutKudu processor to itself:
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Run Flow
Start the QueryDatabaseTable processor.
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Looking at the contents of the FlowFile in the queue, the data from the MySQL table has been ingested and converted to Avro format:
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Start the PutKudu processor to put the data into Kudu:
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This can be confirmed via a Select query:
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With the flow still running, add another row of data to the Mysql "users" table:
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The flow processes this data and the new row appears in Kudu:
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Helpful Links
Here are some links to check out if you are interested in other flows which utilize the record-oriented processors and controller services in NiFi:
Convert CSV to JSON, Avro, XML using ConvertRecord
Installing a local Hortonworks Registry to use with Apache NiFi
Running SQL on FlowFiles using QueryRecord Processor
Using PublishKafkaRecord_0_10 (CSVReader/JSONWriter) in Apache NiFi 1.2+
Using PutElasticsearchHttpRecord (CSVReader)
Using PartitionRecord (GrokReader/JSONWriter) to Parse and Group Log Files
Geo Enrich NiFi Provenance Event Data using LookupRecord
Using PutMongoRecord to put CSV into MongoDB
How-To/Tutorialapache-kuduapache-nifiavromysql
1a-mysql-users-table.png (332.1 kB)
1b-kuduwebclient.png (178.4 kB)
1c-users-kudu-table-created.png (131.8 kB)
2-flow-configuration.png (123.8 kB)
3-add-dbcpconnectionpool.png (238.6 kB)
4-dbcpconnectionpool-configuration.png (129.1 kB)
5-add-avroreader.png (244.4 kB)
6-avroreader-configuration.png (106.4 kB)
7-controllerservices-enabled.png (94.4 kB)
8-add-querydatabasetable.png (157.1 kB)
9-querydatabasetable-configuration.png (92.0 kB)
10-add-putkudu-connect.png (183.4 kB)
11-putkudu-configuration.png (131.0 kB)
12-autoterminate-success.png (139.7 kB)
13-putkudu-failure.png (191.0 kB)
14-querydatabasetable-start.png (191.7 kB)
15-querydatabasetable-flowfile-contents.png (199.1 kB)
16-putkudu-start.png (193.1 kB)
17-users-kudu-table-data.png (253.7 kB)
18-mysql-new-row.png (360.5 kB)
19-kudu-new-row.png (261.2 kB)
putkudu-querydatabasetable.xml (15.1 kB)
可能遇到的问题及其处理方案：
RPC问题
场景
machine003:8000PutKudu[id=83d7455e-7db4-1cb5-0000-00005e82a276] Exception occurred while interacting with Kudu due to RPC can not complete before timeout: KuduRpc(method=GetTableSchema, tablet=null, attempt=23, DeadlineTracker(timeout=30000, elapsed=29282), Traces: [0ms]
querying master, [2ms] Sub rpc: ConnectToMaster sending RPC to server master-47.97.109.43:7051, [26ms] Sub rpc: ConnectToMaster received from server master-47.97.109.43:7051 response Network error: [Peer master-47.97.109.43:7051] Connection disconnected, [27ms] delaying RPC due to Service unavailable: Master config (47.97.109.43:7051) has no leader. Exceptions received: org.apache.kudu.client.RecoverableException: [Peer master-47.97.109.43:7051] Connection disconnected, [42ms]
问题定位
到CDH页面查看Kudu的角色日志：
Unauthorized connection attempt: Server connection negotiation failed: server connection from 47.96.114.97:53732: unauthenticated connections from publicly routable IPs are prohibited. See --trusted_subnets flag for more information.: 47.96.114.97:53732
修改方法
CDH集成Kudu配置调整
# 集群-->kudu -->配置 --> Master -->高级 -->gflagfile 的 Master 高级配置代码段>
-rpc_encryption=disabled
-rpc_authentication=disabled
-trusted_subnets=0.0.0.0/0
# 右上角 ‘保存更改’ --> 重启集群 --> OK
Tips
CDH 查看Kudu运行日志方法：
- 集群 --> kudu --> 命令 -->点击最新的启动命令
- 正在启动服务上的 4 角色 -->对角色 Master (gateway002) 执行命令
- 查看日志[图片上传失败...(image-14035f-1534481079314)]
非CDH：
> find / -name '*master.gflagfile' -type f # 查找配置文件位置
/etc/kudu/conf.dist/master.gflagfile
vi /etc/kudu/conf.dist/master.gflagfile # 修改配置文件
-----------------------------------------------------------
#添加权限设置：
#方式一：
-rpc_encryption=disabled
-rpc_authentication=disabled
#方式二：
# --trusted_subnets=0.0.0.0/0
---------------------------------
参见：
kudu 1.4 单机安装后 运行java-sample
Authentication