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README calls out problems starting from Kafka 2.2. #839

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README calls out problems starting from Kafka 2.2. #839

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26 changes: 14 additions & 12 deletions README.md
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Expand Up @@ -110,26 +110,28 @@ Or install it yourself as:
</tr>
<tr>
<th>Kafka 2.2</th>
<td>Limited support</td>
<td>Limited support</td>
<td>Limited support (*)</td>
<td>Limited support (*)</td>
</tr>
<tr>
<th>Kafka 2.3</th>
<td>Limited support</td>
<td>Limited support</td>
<td>Limited support (*)</td>
<td>Limited support (*)</td>
</tr>
<tr>
<th>Kafka 2.4</th>
<td>Limited support</td>
<td>Limited support</td>
<td>Limited support (*)</td>
<td>Limited support (*)</td>
</tr>
<tr>
<th>Kafka 2.5</th>
<td>Limited support</td>
<td>Limited support</td>
<td>Limited support (*)</td>
<td>Limited support (*)</td>
</tr>
</table>

(\*): There are **production degradations observed when Kafka cluster version >= 2.2**. See for example https://github.com/fluent/fluent-plugin-kafka/issues/315.

This library is targeting Kafka 0.9 with the v0.4.x series and Kafka 0.10 with the v0.5.x series. There's limited support for Kafka 0.8, and things should work with Kafka 0.11, although there may be performance issues due to changes in the protocol.

- **Kafka 0.8:** Full support for the Producer API in ruby-kafka v0.4.x, but no support for consumer groups. Simple message fetching works.
Expand All @@ -139,10 +141,10 @@ This library is targeting Kafka 0.9 with the v0.4.x series and Kafka 0.10 with t
- **Kafka 1.0:** Everything that works with Kafka 0.11 should still work, but so far no features specific to Kafka 1.0 have been added.
- **Kafka 2.0:** Everything that works with Kafka 1.0 should still work, but so far no features specific to Kafka 2.0 have been added.
- **Kafka 2.1:** Everything that works with Kafka 2.0 should still work, but so far no features specific to Kafka 2.1 have been added.
- **Kafka 2.2:** Everything that works with Kafka 2.1 should still work, but so far no features specific to Kafka 2.2 have been added.
- **Kafka 2.3:** Everything that works with Kafka 2.2 should still work, but so far no features specific to Kafka 2.3 have been added.
- **Kafka 2.4:** Everything that works with Kafka 2.3 should still work, but so far no features specific to Kafka 2.4 have been added.
- **Kafka 2.5:** Everything that works with Kafka 2.4 should still work, but so far no features specific to Kafka 2.5 have been added.
- **Kafka 2.2:** Everything that works with Kafka 2.1 should still work (\*), but so far no features specific to Kafka 2.2 have been added.
- **Kafka 2.3:** Everything that works with Kafka 2.2 should still work (\*), but so far no features specific to Kafka 2.3 have been added.
- **Kafka 2.4:** Everything that works with Kafka 2.3 should still work (\*), but so far no features specific to Kafka 2.4 have been added.
- **Kafka 2.5:** Everything that works with Kafka 2.4 should still work (\*), but so far no features specific to Kafka 2.5 have been added.

This library requires Ruby 2.1 or higher.

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