> ## Documentation Index
> Fetch the complete documentation index at: https://clickhouse.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# kafka_* 会话设置

> ClickHouse 在 kafka_* 生成组中的会话设置。

export const SettingsInfoBlock = ({type, default_value, changeable_without_restart}) => {
  return <div className="not-prose" style={{
    display: "flex",
    flexWrap: "wrap",
    alignItems: "baseline",
    columnGap: "0.5rem",
    rowGap: "0.125rem",
    margin: "0.375rem 0",
    fontSize: "0.8125rem",
    lineHeight: "1.125rem"
  }}>
      <div style={{
    fontWeight: 600,
    opacity: 0.72
  }}>类型</div>
      <div style={{
    overflowWrap: "anywhere"
  }}>{type}</div>
      <div style={{
    fontWeight: 600,
    opacity: 0.72,
    marginInlineStart: "0.5rem"
  }}>默认值</div>
      <div style={{
    overflowWrap: "anywhere"
  }}>{default_value}</div>
      {changeable_without_restart && <div style={{
    fontWeight: 600,
    opacity: 0.72,
    marginInlineStart: "0.5rem"
  }}>
          无需重启即可更改
        </div>}
      {changeable_without_restart && <div style={{
    overflowWrap: "anywhere"
  }}>
          {changeable_without_restart}
        </div>}
    </div>;
};

这些设置可在 [system.settings](/docs/zh/reference/system-tables/settings) 中查看，并由 [source](https://github.com/ClickHouse/ClickHouse/blob/master/src/Core/Settings.cpp) 自动生成。

<div id="kafka_disable_num_consumers_limit">
  ## kafka\_disable\_num\_consumers\_limit
</div>

<SettingsInfoBlock type="Bool" default_value="0" />

禁用基于可用 CPU 核心数的 kafka\_num\_consumers 限制。

<div id="kafka_max_wait_ms">
  ## kafka\_max\_wait\_ms
</div>

<SettingsInfoBlock type="毫秒" default_value="5000" />

重试前从 [Kafka](/docs/zh/reference/engines/table-engines/integrations/kafka) 读取消息时的等待时间，单位为毫秒。

可能的值：

* 正整数。
* 0 — 无限超时。

另请参见：

* [Apache Kafka](https://kafka.apache.org/)