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# 简介
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< p align = "center" > < a title = "flink book" target = "_blank" href = "https://github.com/zeekling/flink_book" > < img src = "https://img.shields.io/github/last-commit/zeekling/flink_book.svg?style=flat-square&color=FF9900" > < / a >
< a title = "GitHub repo size in bytes" target = "_blank" href = "https://github.com/zeekling/flink_book" > < img src = "https://img.shields.io/github/repo-size/zeekling/flink_book.svg?style=flat-square" > < / a >
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< a title = "Hits" target = "_blank" href = "https://github.com/zeekling/hits" > < img src = "https://hits.b3log.org/zeekling/flink_book.svg" > < / a > < / p >
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本项目用于学习Flink所做的笔记, 便于以后查看复习。此项目适合我这种虽然比较菜, 且爱学习的人学习。
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# 内存调优
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## 目录
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- [内存等资源调优 ](./调优/Resource.md )
- [状态和CheckPoint 调优 ](./调优/CheckPoint.md )
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- [如何分析及处理 Flink 反压 ](./调优/backpress.md )
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- [Flink SQL 调优 ](./调优/flinkSql.md )
# 常见故障排除
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## 目录
- [常见问题总结 ](./常见问题 )
# Flink SQL
Flink SQL学习笔记提纲。持续更新。Hive SQL 离线Join VS Flink SQL 双流Join。
| 对比维度 | Hive SQL离线Join | Flink SQL双流Join |
| ---| ----|----|
| 数据源 | 有界(离线数据)| 无界(实时数据) |
| 计算次数 | 一次 | 持续计算 |
| 计算结果 | 有界(离线数据) | 无界(实时数据) |
| 计算驱动 | 单边驱动 | 双边驱动 |
## 目录
- [Flink SQL双流Join底层原理 ](./Flink_SQL/双流Join底层原理.md )
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- [时间区间Join ](./Flink_SQL/时间区间Join.md )
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# Flink 源码
源码编译可以使用下面命令
```sh
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mvn install -DskipTests -Dfast -Dpmd.skip=true -Dcheckstyle.skip=true -Dmaven.javadoc.skip=true -Dmaven.compile.fork=true
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```
缺的包可以在 https://conjars.org/repo/org/pentaho/pentaho-aggdesigner-core/5.1.5-jhyde/
https://packages.confluent.io/maven/io/confluent/kafka-schema-registry-client/7.2.2/ 下面找到。
## 目录
- [作业提交流程 ](./source_code/作业提交.md )
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