> ## 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.

# distributed_replica_* 会话设置

> ClickHouse 中 distributed_replica_* 自动生成组的会话设置。

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>;
};

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

<div id="distributed_replica_error_cap">
  ## distributed\_replica\_error\_cap
</div>

<SettingsInfoBlock type="UInt64" default_value="1000" />

* 类型：无符号整数
* 默认值：1000

每个副本的错误计数都会以上述值为上限，防止单个副本累积过多错误。

另请参阅：

* [load\_balancing](/docs/zh/reference/settings/session-settings/load-balancing#load_balancing-round_robin)
* [Distributed 表引擎](/docs/zh/reference/engines/table-engines/special/distributed)
* [distributed\_replica\_error\_half\_life](/docs/zh/reference/settings/session-settings/distributed-replica#distributed_replica_error_half_life)
* [distributed\_replica\_max\_ignored\_errors](/docs/zh/reference/settings/session-settings/distributed-replica#distributed_replica_max_ignored_errors)

<div id="distributed_replica_error_half_life">
  ## distributed\_replica\_error\_half\_life
</div>

<SettingsInfoBlock type="Seconds" default_value="60" />

* 类型：秒
* 默认值：60 秒

控制分布式表中错误计数清零的速度。如果某个副本有一段时间不可用，累计了 5 次错误，并且 `distributed_replica_error_half_life` 设置为 1 秒，那么在最后一次错误发生 3 秒后，该副本会被视为恢复正常。

另请参见：

* [load\_balancing](/docs/zh/reference/settings/session-settings/load-balancing#load_balancing-round_robin)
* [Distributed 表引擎](/docs/zh/reference/engines/table-engines/special/distributed)
* [distributed\_replica\_error\_cap](/docs/zh/reference/settings/session-settings/distributed-replica#distributed_replica_error_cap)
* [distributed\_replica\_max\_ignored\_errors](/docs/zh/reference/settings/session-settings/distributed-replica#distributed_replica_max_ignored_errors)

<div id="distributed_replica_max_ignored_errors">
  ## distributed\_replica\_max\_ignored\_errors
</div>

<SettingsInfoBlock type="UInt64" default_value="0" />

* 类型：无符号整数
* 默认值：0

按 `load_balancing` 算法选择副本时可忽略的错误数量。

另请参见：

* [load\_balancing](/docs/zh/reference/settings/session-settings/load-balancing#load_balancing-round_robin)
* [Distributed 表引擎](/docs/zh/reference/engines/table-engines/special/distributed)
* [distributed\_replica\_error\_cap](/docs/zh/reference/settings/session-settings/distributed-replica#distributed_replica_error_cap)
* [distributed\_replica\_error\_half\_life](/docs/zh/reference/settings/session-settings/distributed-replica#distributed_replica_error_half_life)