Airblader commented on a change in pull request #460:
URL: https://github.com/apache/flink-web/pull/460#discussion_r690298409
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File path: _posts/2021-08-16-connector-table-sql-api-part2.md
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@@ -0,0 +1,434 @@
+---
+layout: post
+title: "Implementing a custom source connector for Table API and SQL - Part
Two "
+date: 2021-08-18T00:00:00.000Z
+authors:
+- Ingo Buerk:
+ name: "Ingo Buerk"
+excerpt:
+---
+
+{% toc %}
+
+# Introduction
+
+In [part one](#) of this tutorial, you learned how to build a custom source
connector for Flink. In part two, you will learn how to integrate the connector
with a test email inbox through the IMAP protocol, filter out emails, and
execute [Flink SQL on the Ververica
Platform](https://www.ververica.com/apache-flink-sql-on-ververica-platform).
+
+# Goals
+
+Part two of the tutorial will teach you how to:
+
+- integrate a source connector which connects to a mailbox using the IMAP
protocol
+- use [Jakarta Mail](https://eclipse-ee4j.github.io/mail/), a Java library
that can send and receive email via the IMAP protocol
+- write [Flink
SQL](https://ci.apache.org/projects/flink/flink-docs-release-1.13/docs/dev/table/sql/overview/)
and execute the queries in the Ververica Platform
+
+You are encouraged to follow along with the code in this
[repository](github.com/Airblader/blog-imap). It provides a boilerplate project
that also comes with a bundled
[docker-compose](https://docs.docker.com/compose/) setup that lets you easily
run the connector. You can then try it out with Flink’s SQL client.
+
+
+# Prerequisites
+
+This tutorial assumes that you have:
+
+- followed the steps outlined in [part one](#) of this tutorial
+- some familiarity with Java and objected-oriented programming
+
+
+# Understand how to fetch emails via the IMAP protocol
+
+Now that you have a working source connector that can run on Flink, it is time
to connect to an email server via IMAP (an Internet protocol that allows email
clients to retrieve messages from a mail server) so that Flink can process
emails instead of test static data.
+
+You will use [Jakarta Mail](https://eclipse-ee4j.github.io/mail/), a Java
library that can be used to send and receive email via IMAP. For simplicity,
authentication will use a plain username and password.
+
+This tutorial will focus more on how to implement a connector for Flink. If
you want to learn more about the details of how IMAP or Jakarta Mail work, you
are encouraged to explore a more extensive implementation at this
[repository](github.com/Airblader/flink-connector-email).
Review comment:
The correct link has changed to `github.com/TNG/flink-connector-email`
now.
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