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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-9947) Document unified table sources/sinks/formats
Date Thu, 02 Aug 2018 10:05:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-9947?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16566573#comment-16566573
] 

ASF GitHub Bot commented on FLINK-9947:
---------------------------------------

fhueske commented on a change in pull request #6456: [FLINK-9947] [docs] Document unified
table sources/sinks/formats
URL: https://github.com/apache/flink/pull/6456#discussion_r207139110
 
 

 ##########
 File path: docs/dev/table/connect.md
 ##########
 @@ -67,14 +67,24 @@ This table is only available for stable releases.
 Overview
 --------
 
-Beginning from Flink 1.6, the declaration of a connection to an external system is separated
from the actual implementation. Connections can be specified either
+Beginning from Flink 1.6, the declaration of a connection to an external system is separated
from the actual implementation.
+
+Connections can be specified either
 
 - **programmatically** using a `Descriptor` under `org.apache.flink.table.descriptors` for
Table & SQL API
 - or **declaratively** via [YAML configuration files](http://yaml.org/) for the SQL Client.
 
-This allows not only for better unification of APIs and SQL Client but also for better extensibility
in case of [custom implementations](sourceSinks.html) without changing the declaration.
+This allows not only for better unification of APIs and SQL Client but also for better extensibility
in case of [custom implementations](sourceSinks.html) without changing the actual declaration.
+
+Every declaration is similar to a SQL `CREATE TABLE` statement. One can define the name of
the table, the final schema of the table, a connector, and a data format upfront for connecting
to an external system.
+
+The **connector** describes the external system that should be used as a source and/or target
of data. Storage systems such as [Apacha Kafka](http://kafka.apache.org/) or a regular file
system can be declared here. The connector might already provide a fixed format with fields
and schema.
 
 Review comment:
   `The **connector** describes the external system that stores the data of a table.`

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> Document unified table sources/sinks/formats
> --------------------------------------------
>
>                 Key: FLINK-9947
>                 URL: https://issues.apache.org/jira/browse/FLINK-9947
>             Project: Flink
>          Issue Type: Improvement
>          Components: Documentation, Table API &amp; SQL
>            Reporter: Timo Walther
>            Assignee: Timo Walther
>            Priority: Major
>              Labels: pull-request-available
>
> The recent unification of table sources/sinks/formats needs documentation. I propose
a new page that explains the built-in sources, sinks, and formats as well as a page for customization
of public interfaces.



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