Flink sql-client save checkpoint 测试

一、测试环境准备
1、MySQL环境
version：5.7.34

IP：192.168.124.44

TAB：company、products、result

company

products

result

2、flink
version：flink-1.13.2

IP：192.168.124.48

TAB:

– creates a mysql cdc table source
–同步products表
注意：建表的时候需要设置主键，可以MySQL结构设置，否则会报错，或者通过修改参数，可以不加主键

CREATE TABLE products (
id INT NOT NULL PRIMARY key ,
name STRING,
description STRING,
weight DECIMAL(10,3)
) WITH (
‘connector’ = ‘mysql-cdc’,
‘hostname’ = ‘192.168.124.44’,
‘port’ = ‘3306’,
‘username’ = ‘myflink’,
‘password’ = ‘sg123456A@’,
‘database-name’ = ‘inventory’,
‘table-name’ = ‘products’
);

–同步company表

CREATE TABLE company(
id INT NOT NULL PRIMARY key ,
company STRING
) WITH (
‘connector’ = ‘mysql-cdc’,
‘hostname’ = ‘192.168.124.44’,
‘port’ = ‘3306’,
‘username’ = ‘myflink’,
‘password’ = ‘sg123456A@’,
‘database-name’ = ‘inventory’,
‘table-name’ = ‘company’
);

CREATE TABLE mysql_result (
id INT NOT NULL,
name STRING,
description STRING,
weight DECIMAL(10,3),
company STRING,
PRIMARY KEY (id) NOT ENFORCED
) WITH (
‘connector’ = ‘jdbc’,
‘url’ = ‘jdbc:mysql://192.168.124.44:3306/inventory’,
‘username’ = ‘root’,
‘password’ = ‘sg123456’,
‘table-name’ = ‘result’
);

insert into mysql_result (id,name,description,weight,company)
select
a.id,
a.name,
a.description,
a.weight,
b.company
from products a
left join company b
on a.id = b.id;

二、编辑flink sql job 初始化配置文件与DML文件
1、初始化配置文件
初始化配置文件可以包含多个job的初始化数据DDL信息

[root@flinkdb01 flinksqljob]# cat myjob-ddl
–创建测试DB

create database inventory;

use inventory;

– creates a mysql cdc table source
–同步products表
CREATE TABLE products (
id INT NOT NULL PRIMARY key ,
name STRING,
description STRING,
weight DECIMAL(10,3)
) WITH (
‘connector’ = ‘mysql-cdc’,
‘hostname’ = ‘192.168.2.100’,
‘port’ = ‘3306’,
‘username’ = ‘root’,
‘password’ = ‘sg123456’,
‘database-name’ = ‘inventory’,
‘table-name’ = ‘products’
);

–同步company表
CREATE TABLE company(
id INT NOT NULL PRIMARY key ,
company STRING
) WITH (
‘connector’ = ‘mysql-cdc’,
‘hostname’ = ‘192.168.2.100’,
‘port’ = ‘3306’,
‘username’ = ‘root’,
‘password’ = ‘sg123456’,
‘database-name’ = ‘inventory’,
‘table-name’ = ‘company’
);

2、job dml文件
[root@flinkdb01 flinksqljob]# cat myjob-dml

– set sync mode
SET ‘table.dml-sync’ = ‘true’;

– set the job name
SET pipeline.name = SqlJob_mysql_result;

– set the queue that the job submit to
–SET ‘yarn.application.queue’ = ‘root’;

– set the job parallism
–SET ‘parallism.default’ = ‘100’;

– restore from the specific savepoint path

– 注意：在初始化job的DML文件中不需要设置此选项，此选项是job失败/停止后，从某个checkpoint点回复job所用
–SET ‘execution.savepoint.path’ = ‘/u01/soft/flink/flinkjob/flinksqljob/checkpoint/b2f2b0dda89bfb41df57d939479d7786/chk-407’;

–设置savepoint 时间
–set ‘execution.checkpointing.interval’ = ‘2sec’;

insert into mysql_result01 (id,name,description,weight,company)
select
a.id,
a.name,
a.description,
a.weight,
b.company
from products a
left join company b
on a.id = b.id;

三、开启checkpoint 与 savepoint
1、编辑flink-conf.yaml文件
#==============================================================================

Fault tolerance and checkpointing

#==============================================================================
execution.checkpointing.interval: 5000 ##单位毫秒，checkpoint时间间隔
state.checkpoints.num-retained: 20 ##单位个，保存checkpoint的个数
execution.checkpointing.mode: EXACTLY_ONCE
execution.checkpointing.externalized-checkpoint-retention: RETAIN_ON_CANCELLATION
#state.backend: rocksdb

The backend that will be used to store operator state checkpoints if

checkpointing is enabled.

Supported backends are ‘jobmanager’, ‘filesystem’, ‘rocksdb’, or the

.

state.backend: filesystem

state.backend: filesystem #checkpoint 保存模式

Directory for checkpoints filesystem, when using any of the default bundled

state backends.

state.checkpoints.dir: hdfs://namenode-host:port/flink-checkpoints

state.checkpoints.dir: file:///u01/soft/flink/flinkjob/flinksqljob/checkpoint ##checkpoint 保存路径，需要使用URL方式

Default target directory for savepoints, optional.

state.savepoints.dir: hdfs://namenode-host:port/flink-savepoints

state.savepoints.dir: file:///u01/soft/flink/flinkjob/flinksqljob/checkpoint ##savepoint保存路径，需要使用URL方式，应该已经合并到checkpoint中，在实验中设置了，也没生成（现阶段

flink checkpoint 需要手动触发）

Flag to enable/disable incremental checkpoints for backends that

support incremental checkpoints (like the RocksDB state backend).

state.backend.incremental: false

state.backend.incremental: true

注意：checkpoint路径必须设置为URL模式，否则运行job时，会报错

2、重启flink使得配置生效
systemctl restart flink.service

systemctl status flink.service

四、测试checkpoint恢复
1、初始化DDL与DML JOB
[root@flinkdb01 flinksqljob]# flinksql -i myjob-ddl -f myjob-dml

No default environment specified.
Searching for ‘/u01/soft/flink/flink-1.13.2/conf/sql-client-defaults.yaml’…not found.
Successfully initialized from sql script: file:/u01/soft/flink/flinkjob/flinksqljob/myjob-ddl
[INFO] Executing SQL from file.
Flink SQL>

SET pipeline.name = SqlJob_mysql_result;
[INFO] Session property has been set.
Flink SQL>

insert into mysql_result (id,name,description,weight,company)
select
a.id,
a.name,
a.description,
a.weight,
b.company
from products a
left join company b
on a.id = b.id;
[INFO] Submitting SQL update statement to the cluster…
[INFO] SQL update statement has been successfully submitted to the cluster:
Job ID: f39957c3386e1e943f50ac16d4e3f809

Shutting down the session…
done.
[root@flinkdb01 flinksqljob]#

2、查看JOB
1）终端查看job
[root@flinkdb01 flinksqljob]# flink list

2)web查看job

3、查看JOB的checkpoint

4、cancel DML JOB

5、从checkpoint恢复
1）查看cancel后的checkpoint
可以看到最后一个checkpoint是：/u01/soft/flink/flinkjob/flinksqljob/checkpoint/f39957c3386e1e943f50ac16d4e3f809/chk-59

2）从最后的checkpoint恢复
配置用于回复的DML文件

[root@flinkdb01 flinksqljob]# cat myjob-dml-restore
– set sync mode
–SET ‘table.dml-sync’ = ‘true’;

– set the job name
–SET pipeline.name = SqlJob_mysql_result;

– set the queue that the job submit to
–SET ‘yarn.application.queue’ = ‘root’;

– set the job parallism
–SET ‘parallism.default’ = ‘100’;

– restore from the specific savepoint path
SET ‘execution.savepoint.path’ = ‘/u01/soft/flink/flinkjob/flinksqljob/checkpoint/f39957c3386e1e943f50ac16d4e3f809/chk-59’;

–设置savepoint 时间
–set ‘execution.checkpointing.interval’ = ‘2sec’;

insert into mysql_result (id,name,description,weight,company)
select
a.id,
a.name,
a.description,
a.weight,
b.company
from products a
left join company b
on a.id = b.id;

3）恢复job
[root@flinkdb01 flinksqljob]# flinksql -i myjob-ddl -f myjob-dml-restore
No default environment specified.
Searching for ‘/u01/soft/flink/flink-1.13.2/conf/sql-client-defaults.yaml’…not found.
Successfully initialized from sql script: file:/u01/soft/flink/flinkjob/flinksqljob/myjob-ddl
[INFO] Executing SQL from file.
Flink SQL>

SET ‘execution.savepoint.path’ = ‘/u01/soft/flink/flinkjob/flinksqljob/checkpoint/f39957c3386e1e943f50ac16d4e3f809/chk-59’;
[INFO] Session property has been set.
Flink SQL>

insert into mysql_result (id,name,description,weight,company)
select
a.id,
a.name,
a.description,
a.weight,
b.company
from products a
left join company b
on a.id = b.id;
[INFO] Submitting SQL update statement to the cluster…
[INFO] SQL update statement has been successfully submitted to the cluster:
Job ID: f6f481776a2f24fbb9d050ea150e77cf

Shutting down the session…
done.

4）查看job恢复情况

五、测试savepoint恢复
1、手动生成savepoint
2、cancel job
3、从savepoint 恢复