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Document supported Kafka versions

Description

We currently don't document which version of Kafka we ship with CDAP, nor which version(s) we would support for an external Kafka server.

The current version of Kafka (as of 4.0.0-SNAPSHOT) is 0.8.2.2, and can be found in the pom.xml:

We mention the embedded version on http://docs.cask.co/cdap/current/en/admin-manual/cdap-components.html.

We mention using an external version on:

Each of the installation guides mentions Kafka, such as http://docs.cask.co/cdap/current/en/admin-manual/installation/packages.html?highlight=kafka.

The build script (common_conf.py) could be modified to extract the Kafka version as it does the CDAP version (in get_sdk_version()) and publish it as part of the rst_epilog, as the "embedded-kafka-version".

We need to test higher versions to see if they are compatible; currently, only 0.8.2.2 is known as.

Not certain where to add this version information, as this is not obvious. Perhaps on either of these:

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Created November 18, 2016 at 12:01 AM
Updated September 20, 2018 at 1:32 AM
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