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flink维表查询redis之flink-connector-redis

岑光熙
2023-12-01

EN

项目介绍

基于bahir-flink二次开发,相对bahir调整的内容有:

1.使用Lettuce替换Jedis,同步读写改为异步读写,大幅度提升了性能 
2.增加了Table/SQL API,增加维表查询支持
3.增加查询缓存(支持增量与全量)
4.增加支持整行保存功能,用于多字段的维表关联查询
5.增加限流功能,用于Flink SQL在线调试功能
6.增加支持Flink高版本(包括1.12,1.13,1.14+)
7.统一过期策略等。

因bahir使用的flink接口版本较老,所以改动较大,开发过程中参考了腾讯云与阿里云两家产商的流计算产品,取两家之长,并增加了更丰富的功能。

支持功能对应redis的操作命令有:

插入维表查询
setget
hsethget
rpush lpush
incrBy incrByFloat decrBy hincrBy hincryByFloat zincrby
sadd zadd pfadd(hyperloglog)
publish
zrem srem
del hdel

使用方法:

在命令行执行 mvn package -DskipTests打包后,将生成的包flink-connector-redis-1.2.1.jar引入flink lib中即可,无需其它设置。


项目依赖Lettuce 6.2.1,如flink环境无lettuce,则使用flink-connector-redis-1.2.1-jar-with-dependencies.jar


开发环境工程直接引用:

<dependency>
    <groupId>io.github.jeff-zou</groupId>
    <artifactId>flink-connector-redis</artifactId>
    <version>1.2.1</version>
</dependency>

使用说明:

value.data.structure = column(默认)

无需通过primary key来映射redis中的Key,直接由ddl中的字段顺序来决定Key,如:

create table sink_redis(username VARCHAR, passport VARCHAR)  with ('command'='set') 
其中username为key, passport为value.

create table sink_redis(name VARCHAR, subject VARCHAR, score VARCHAR)  with ('command'='hset') 
其中name为map结构的key, subject为field, score为value.

value.data.structure = row

整行内容保存至value并以’\01’分割

create table sink_redis(username VARCHAR, passport VARCHAR)  with ('command'='set') 
其中username为key, username\01passport为value.

create table sink_redis(name VARCHAR, subject VARCHAR, score VARCHAR)  with ('command'='hset') 
其中name为map结构的key, subject为field, name\01subject\01score为value.

with参数说明:

字段默认值类型说明
connector(none)Stringredis
host(none)StringRedis IP
port6379IntegerRedis 端口
passwordnullString如果没有设置,则为 null
database0Integer默认使用 db0
timeout2000Integer连接超时时间,单位 ms,默认 1s
cluster-nodes(none)String集群ip与端口,当redis-mode为cluster时不为空,如:10.11.80.147:7000,10.11.80.147:7001,10.11.80.147:8000
command(none)String对应上文中的redis命令
redis-mode(none)Integermode类型: single cluster
lookup.cache.max-rows-1Integer查询缓存大小,减少对redis重复key的查询
lookup.cache.ttl-1Integer查询缓存过期时间,单位为秒, 开启查询缓存条件是max-rows与ttl都不能为-1
lookup.max-retries1Integer查询失败重试次数
lookup.cache.load-allfalseBoolean开启全量缓存,当命令为hget时,将从redis map查询出所有元素并保存到cache中,用于解决缓存穿透问题
sink.max-retries1Integer写入失败重试次数
sink.parallelism(none)Integer写入并发数
value.data.structurecolumnStringcolumn: value值来自某一字段 (如, set: key值取自DDL定义的第一个字段, value值取自第二个字段)
row: 将整行内容保存至value并以’\01’分割
在线调试SQL时,用于限制sink资源使用的参数:
FieldDefaultTypeDescription
sink.limitfalseBoolean限制开头
sink.limit.max-num10000Integertaskmanager内每个slot可以写的最大数据量
sink.limit.interval100Stringtaskmanager内每个slot写入数据间隔 milliseconds
sink.limit.max-online30 * 60 * 1000LLongtaskmanager内每个slot最大在线时间, milliseconds

集群类型为sentinel时额外连接参数:

字段默认值类型说明
master.name(none)String主名
sentinels.info(none)String如:10.11.80.147:7000,10.11.80.147:7001,10.11.80.147:8000
sentinels.passwordnone)String

数据类型转换

flink typeredis row converter
CHARString
VARCHARString
StringString
BOOLEANString String.valueOf(boolean val)
boolean Boolean.valueOf(String str)
BINARYString Base64.getEncoder().encodeToString
byte[] Base64.getDecoder().decode(String str)
VARBINARYString Base64.getEncoder().encodeToString
byte[] Base64.getDecoder().decode(String str)
DECIMALString BigDecimal.toString
DecimalData DecimalData.fromBigDecimal(new BigDecimal(String str),int precision, int scale)
TINYINTString String.valueOf(byte val)
byte Byte.valueOf(String str)
SMALLINTString String.valueOf(short val)
short Short.valueOf(String str)
INTEGERString String.valueOf(int val)
int Integer.valueOf(String str)
DATEString the day from epoch as int
date show as 2022-01-01
TIMEString the millisecond from 0’clock as int
time show as 04:04:01.023
BIGINTString String.valueOf(long val)
long Long.valueOf(String str)
FLOATString String.valueOf(float val)
float Float.valueOf(String str)
DOUBLEString String.valueOf(double val)
double Double.valueOf(String str)
TIMESTAMPString the millisecond from epoch as long
timestamp TimeStampData.fromEpochMillis(Long.valueOf(String str))

使用示例:

  • 维表查询:
create table sink_redis(name varchar, level varchar, age varchar) with ( 'connector'='redis', 'host'='10.11.80.147','port'='7001', 'redis-mode'='single','password'='******','command'='hset');

-- 先在redis中插入数据,相当于redis命令: hset 3 3 100 --
insert into sink_redis select * from (values ('3', '3', '100'));
                
create table dim_table (name varchar, level varchar, age varchar) with ('connector'='redis', 'host'='10.11.80.147','port'='7001', 'redis-mode'='single', 'password'='*****','command'='hget', 'maxIdle'='2', 'minIdle'='1', 'lookup.cache.max-rows'='10', 'lookup.cache.ttl'='10', 'lookup.max-retries'='3');
    
-- 随机生成10以内的数据作为数据源 --
-- 其中有一条数据会是: username = 3  level = 3, 会跟上面插入的数据关联 -- 
create table source_table (username varchar, level varchar, proctime as procTime()) with ('connector'='datagen',  'rows-per-second'='1',  'fields.username.kind'='sequence',  'fields.username.start'='1',  'fields.username.end'='10', 'fields.level.kind'='sequence',  'fields.level.start'='1',  'fields.level.end'='10');

create table sink_table(username varchar, level varchar,age varchar) with ('connector'='print');

insert into
	sink_table
select
	s.username,
	s.level,
	d.age
from
	source_table s
left join dim_table for system_time as of s.proctime as d on
	d.name = s.username
	and d.level = s.level;
-- username为3那一行会关联到redis内的值,输出为: 3,3,100	
  • 多字段的维表关联查询

很多情况维表有多个字段,本实例展示如何利用’value.data.structure’='row’写多字段并关联查询。

-- 创建表
create table sink_redis(uid VARCHAR,score double,score2 double )
with ( 'connector' = 'redis',
			'host' = '10.11.69.176',
			'port' = '6379',
			'redis-mode' = 'single',
			'password' = '****',
			'command' = 'SET',
			'value.data.structure' = 'row');  -- 'value.data.structure'='row':整行内容保存至value并以'\01'分割
-- 写入测试数据,score、score2为需要被关联查询出的两个维度
insert into sink_redis select * from (values ('1', 10.3, 10.1));

-- 在redis中,value的值为: "1\x0110.3\x0110.1" --
-- 写入结束 --

-- create join table --
create table join_table with ('command'='get', 'value.data.structure'='row') like sink_redis

-- create result table --
create table result_table(uid VARCHAR, username VARCHAR, score double, score2 double) with ('connector'='print')

-- create source table --
create table source_table(uid VARCHAR, username VARCHAR, proc_time as procTime()) with ('connector'='datagen', 'fields.uid.kind'='sequence', 'fields.uid.start'='1', 'fields.uid.end'='2')

-- 关联查询维表,获得维表的多个字段值 --
insert
	into
	result_table
select
	s.uid,
	s.username,
	j.score, -- 来自维表
	j.score2 -- 来自维表
from
	source_table as s
join join_table for system_time as of s.proc_time as j on
	j.uid = s.uid
	
result:
2> +I[2, 1e0fe885a2990edd7f13dd0b81f923713182d5c559b21eff6bda3960cba8df27c69a3c0f26466efaface8976a2e16d9f68b3, null, null]
1> +I[1, 30182e00eca2bff6e00a2d5331e8857a087792918c4379155b635a3cf42a53a1b8f3be7feb00b0c63c556641423be5537476, 10.3, 10.1]
  • DataStream查询方式

    示例代码路径: src/test/java/org.apache.flink.streaming.connectors.redis.datastream.DataStreamTest.java

    hset示例,相当于redis命令:hset tom math 150

Configuration configuration = new Configuration();
configuration.setString(REDIS_MODE, REDIS_CLUSTER);
configuration.setString(REDIS_COMMAND, RedisCommand.HSET.name());

RedisSinkMapper redisMapper = (RedisSinkMapper)RedisHandlerServices
.findRedisHandler(RedisMapperHandler.class, configuration.toMap())
.createRedisMapper(configuration);

StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();

GenericRowData genericRowData = new GenericRowData(3);
genericRowData.setField(0, "tom");
genericRowData.setField(1, "math");
genericRowData.setField(2, "152");
DataStream<GenericRowData> dataStream = env.fromElements(genericRowData, genericRowData);

RedisCacheOptions redisCacheOptions = new RedisCacheOptions.Builder().setCacheMaxSize(100).setCacheTTL(10L).build();
FlinkJedisConfigBase conf = getLocalRedisClusterConfig();
RedisSinkFunction redisSinkFunction = new RedisSinkFunction<>(conf, redisMapper, redisCacheOptions);

dataStream.addSink(redisSinkFunction).setParallelism(1);
env.execute("RedisSinkTest");
  • redis-cluster写入示例

    示例代码路径: src/test/java/org.apache.flink.streaming.connectors.redis.table.SQLTest.java

    set示例,相当于redis命令: set test test11

StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
EnvironmentSettings environmentSettings = EnvironmentSettings.newInstance().useBlinkPlanner().inStreamingMode().build();
StreamTableEnvironment tEnv = StreamTableEnvironment.create(env, environmentSettings);

String ddl = "create table sink_redis(username VARCHAR, passport VARCHAR) with ( 'connector'='redis', " +
              "'cluster-nodes'='10.11.80.147:7000,10.11.80.147:7001','redis- mode'='cluster','password'='******','command'='set')" ;

tEnv.executeSql(ddl);
String sql = " insert into sink_redis select * from (values ('test', 'test11'))";
TableResult tableResult = tEnv.executeSql(sql);
tableResult.getJobClient().get()
.getJobExecutionResult()
.get();

开发与测试环境

ide: IntelliJ IDEA

code format: google-java-format + Save Actions

code check: CheckStyle

flink 1.12/1.13/1.14+

jdk1.8 Lettuce 6.2.1

如果需要flink 1.12版本支持,请切换到分支flink-1.12(注:1.12使用jedis)

<dependency>
    <groupId>io.github.jeff-zou</groupId>
    <artifactId>flink-connector-redis</artifactId>
    <version>1.1.1-1.12</version>
</dependency>
 类似资料: