---
{
    "title": "ALTER ROUTINE LOAD",
    "language": "zh-CN"
}
---

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# ALTER ROUTINE LOAD
## description

该语法用于修改已经创建的例行导入作业。

只能修改处于 PAUSED 状态的作业。

语法：

    ALTER ROUTINE LOAD FOR [db.]job_name
    [job_properties]
    FROM data_source
    [data_source_properties]

1. `[db.]job_name`

    指定要修改的作业名称。

2. `tbl_name`

    指定需要导入的表的名称。

3. `job_properties`

    指定需要修改的作业参数。目前仅支持如下参数的修改：
    
    1. `desired_concurrent_number`
    2. `max_error_number`
    3. `max_batch_interval`
    4. `max_batch_rows`
    5. `max_batch_size`
    6. `jsonpaths`
    7. `json_root`
    8. `strip_outer_array`
    9. `strict_mode`
    10. `timezone`


4. `data_source`

    数据源的类型。当前支持：

    KAFKA

5. `data_source_properties`

    数据源的相关属性。目前仅支持：
    
    1. `kafka_partitions`
    2. `kafka_offsets`
    3. 自定义 property，如 `property.group.id`
    
    注：
    
    1. `kafka_partitions` 和 `kafka_offsets` 用于修改待消费的 kafka partition 的offset，仅能修改当前已经消费的 partition。不能新增 partition。

## example

1. 将 `desired_concurrent_number` 修改为 1

    ```
    ALTER ROUTINE LOAD FOR db1.label1
    PROPERTIES
    (
        "desired_concurrent_number" = "1"
    );
    ```

2.  将 `desired_concurrent_number` 修改为 10，修改 partition 的offset，修改 group id。

    ```
    ALTER ROUTINE LOAD FOR db1.label1
    PROPERTIES
    (
        "desired_concurrent_number" = "10"
    )
    FROM kafka
    (
        "kafka_partitions" = "0, 1, 2",
        "kafka_offsets" = "100, 200, 100",
        "property.group.id" = "new_group"
    );
    ```


## keyword

    ALTER,ROUTINE,LOAD