> ## 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.

# format_avro_* format settings

> ClickHouse format settings in the format_avro_* generated group.

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
  }}>Type</div>
      <div style={{
    overflowWrap: "anywhere"
  }}>{type}</div>
      <div style={{
    fontWeight: 600,
    opacity: 0.72,
    marginInlineStart: "0.5rem"
  }}>Default</div>
      <div style={{
    overflowWrap: "anywhere"
  }}>{default_value}</div>
      {changeable_without_restart && <div style={{
    fontWeight: 600,
    opacity: 0.72,
    marginInlineStart: "0.5rem"
  }}>
          Changeable without restart
        </div>}
      {changeable_without_restart && <div style={{
    overflowWrap: "anywhere"
  }}>
          {changeable_without_restart}
        </div>}
    </div>;
};

These settings are autogenerated from [source](https://github.com/ClickHouse/ClickHouse/blob/master/src/Core/FormatFactorySettings.h).

<h2 id="format_avro_schema_registry_connection_timeout">
  format\_avro\_schema\_registry\_connection\_timeout
</h2>

<SettingsInfoBlock type="UInt64" default_value="1" />

<VersionHistory rows={[{"id": "row-1","items": [{"label": "26.5"},{"label": "1"},{"label": "New setting to control the connection timeout (in seconds) for the Confluent Schema Registry HTTP client used by AvroConfluent format."}]}]} />

For AvroConfluent format: connection timeout in seconds for the Confluent Schema Registry HTTP client. Used by both schema fetch and schema registration. Must be greater than 0 and less than 600 (10 minutes).

<h2 id="format_avro_schema_registry_max_retries">
  format\_avro\_schema\_registry\_max\_retries
</h2>

<SettingsInfoBlock type="UInt64" default_value="5" />

<VersionHistory rows={[{"id": "row-1","items": [{"label": "26.6"},{"label": "5"},{"label": "New setting controlling the maximum number of retries for transient failures (transport timeouts, connection refused, DNS errors, HTTP 5xx\/408\/429) when communicating with the Confluent Schema Registry. Set to 0 to disable retries. Previous behavior (no retries) is preserved by `compatibility = '26.5'`."}]}]} />

For AvroConfluent format: maximum number of retries for transient failures when communicating with the Confluent Schema Registry (transport timeouts, connection refused, DNS errors, HTTP 5xx/408/429). Set to 0 to disable retries. The maximum allowed value is 20. Schema validation errors (HTTP 409, malformed Avro JSON) are not retried.

<h2 id="format_avro_schema_registry_receive_timeout">
  format\_avro\_schema\_registry\_receive\_timeout
</h2>

<SettingsInfoBlock type="UInt64" default_value="1" />

<VersionHistory rows={[{"id": "row-1","items": [{"label": "26.5"},{"label": "1"},{"label": "New setting to control the receive timeout (in seconds) for the Confluent Schema Registry HTTP client used by AvroConfluent format."}]}]} />

For AvroConfluent format: receive timeout in seconds for the Confluent Schema Registry HTTP client. Used by both schema fetch and schema registration. Must be greater than 0 and less than 600 (10 minutes).

<h2 id="format_avro_schema_registry_retry_initial_backoff_ms">
  format\_avro\_schema\_registry\_retry\_initial\_backoff\_ms
</h2>

<SettingsInfoBlock type="UInt64" default_value="100" />

<VersionHistory rows={[{"id": "row-1","items": [{"label": "26.6"},{"label": "100"},{"label": "New setting controlling the initial backoff (in milliseconds) before retrying a failed Confluent Schema Registry request. The backoff doubles on each retry, capped at 10 seconds. Has no effect when `format_avro_schema_registry_max_retries = 0` (the pre-26.6 behavior restored by `compatibility = '26.5'`)."}]}]} />

For AvroConfluent format: initial backoff in milliseconds before retrying a failed Confluent Schema Registry request. The backoff doubles on each subsequent retry, capped at 10 seconds. Must be greater than 0 and less than or equal to 60000.

<h2 id="format_avro_schema_registry_send_timeout">
  format\_avro\_schema\_registry\_send\_timeout
</h2>

<SettingsInfoBlock type="UInt64" default_value="1" />

<VersionHistory rows={[{"id": "row-1","items": [{"label": "26.5"},{"label": "1"},{"label": "New setting to control the send timeout (in seconds) for the Confluent Schema Registry HTTP client used by AvroConfluent format."}]}]} />

For AvroConfluent format: send timeout in seconds for the Confluent Schema Registry HTTP client. Used by both schema fetch and schema registration. Must be greater than 0 and less than 600 (10 minutes).

<h2 id="format_avro_schema_registry_url">
  format\_avro\_schema\_registry\_url
</h2>

For AvroConfluent format: Confluent Schema Registry URL.