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Add explanation about two kafka parameters #4951

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Dec 21, 2020
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Add explanation about two kafka parameters #4951

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Update ticdc/manage-ticdc.md
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5 changes: 5 additions & 0 deletions ticdc/manage-ticdc.md
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Expand Up @@ -141,10 +141,15 @@ URI 中可配置的的参数如下：
| `max-message-bytes` | 每次向 Kafka broker 发送消息的最大数据量（可选，默认值 `64MB`） |
| `replication-factor` | kafka 消息保存副本数（可选，默认值 `1`） |
| `protocol` | 输出到 kafka 消息协议，可选值有 `default`、`canal`、`avro`、`maxwell`（默认值为 `default`） |
| `max-batch-size` | 如果消息协议支持将多条变更记录输出到一条 kafka 消息，该参数指定一条 kafka 消息中变更记录的最多数量，目前仅对 Kafka 的 `protocol` 为 `default` 时有效，从 v4.0.9 开始生效（可选，默认值为 `4096`)
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| `ca` | 连接下游 Kafka 实例所需的 CA 证书文件路径（可选） |
| `cert` | 连接下游 Kafka 实例所需的证书文件路径（可选） |
| `key` | 连接下游 Kafka 实例所需的证书密钥文件路径（可选） |

> **注意：**
>
> 当 `protocol` 为 `default` 时，TiCDC 会尽量避免产生长度超过 `max-message-bytes` 的消息。但如果单条数据变更记录需要超过 `max-message-bytes` 个字节来表示，为了避免静默失败，TiCDC 会试图输出这条消息并在日志中输出 Warning。

#### TiCDC 集成 Kafka Connect (Confluent Platform)

> **警告：**
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