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# FILE Parameter | ||
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Use the file parameter to pass files (or folders, hereinafter referred to as **files**) in the working directory of the upstream task to the downstream task in the same workflow instance. The following scenarios may be used | ||
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- In the ETL task, pass the data files processed by multiple upstream tasks to a specific downstream task. | ||
- In the machine learning scenario, pass the data set file of the upstream data preparation task to the downstream model training task. | ||
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## Usage | ||
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### Configure file parameter | ||
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File parameter configuration method: click the plus sign on the right side of "Custom Parameters" on the task definition page to configure. | ||
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### Output file to downstream task | ||
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**Four options of custom parameters are:** | ||
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- Parameter name: the identifier used when passing tasks, such as `KEY1` and `KEY2` in the figure below | ||
- Direction: OUT, which means outputting the file to the downstream task | ||
- Parameter type: FILE, indicating file parameter | ||
- Parameter value: output file path, such as `data` and `data/test2/text.txt` in the figure below | ||
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The configuration in the figure below indicates that the `output` task passes two file data to the downstream task, respectively: | ||
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- Pass out the folder `data`, and mark it as `dir-data`. The downstream task can get this folder through `output.dir-data` | ||
- Pass out the file `data/test2/text.txt`, and mark it as `file-text`. The downstream task can get this folder through `output.file-text` | ||
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![img.png](../../../../img/new_ui/dev/parameter/file_parameter_output.png) | ||
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### Get the file from the upstream task | ||
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**Four options of custom parameters are:** | ||
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- Parameter name: the position where the upstream file is saved after input, such as `input_dir` used in the figure below | ||
- Direction: IN, which means to get the file from the upstream task | ||
- Parameter type: FILE, indicating file parameter | ||
- Parameter value: the identifier of the upstream file, in the format of `taskName.KEY`. For example, `output.dir-data` in the figure below, where `output` is the name of the upstream task, and `dir-data` is the file identifier output by the upstream task | ||
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The configuration in the figure below indicates that the task gets the folder identified by `dir-data` from the upstream task `output` and saves it as `input_dir` | ||
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![img.png](../../../../img/new_ui/dev/parameter/file_parameter_input_dir.png) | ||
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The configuration in the figure below indicates that the task gets the file identified by `file-text` from the upstream task `output` and saves it as `input.txt` | ||
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![img.png](../../../../img/new_ui/dev/parameter/file_parameter_input_file.png) | ||
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## Other | ||
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### Note | ||
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- The file transfer between upstream and downstream tasks is based on the resource center as a transfer, and the data is saved in the `DATA_TRANSFER` directory of the resource center. Therefore, **the resource center function must be enabled**, please refer to [Resource Center Configuration Details](../resource/configuration.md) for details, otherwise the file parameter function cannot be used. | ||
- The file naming rule is `DATA_TRANSFER/DATE/ProcessDefineCode/ProcessDefineVersion_ProcessInstanceID/TaskName_TaskInstanceID_FileName` | ||
- If the transferred file data is a folder, it will be packaged into a compressed file with a suffix of `.zip` and uploaded. The downstream task will unzip and save it in the corresponding directory after receiving it | ||
- If you need to delete the file data, you can delete the corresponding folder in the `DATA_TRANSFER` directory of the resource center. If you delete the date subdirectory directly, you will delete all the file data on that date | ||
- If there is a task chain task1->task2->tas3, then the downstream task task3 can also get the file data of task1 | ||
- Support one-to-many transmission and many-to-one transmission | ||
- If you frequently transfer a large number of files, it is obvious that the system IO performance will be affected by the amount of transferred data | ||
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### Example | ||
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You can save the following YAML file locally and then execute `pydolphinscheduler yaml -f data-transfer.yaml` to run the Demo. | ||
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```yaml | ||
# Define the workflow | ||
workflow: | ||
name: "data-transfer" | ||
run: true | ||
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# Define the tasks under the workflow | ||
tasks: | ||
- name: output | ||
task_type: Shell | ||
command: | | ||
mkdir -p data/test1 data/test2 | ||
echo "test1 message" >> data/test1/text.txt | ||
echo "test2 message" >> data/test2/text.txt | ||
tree . | ||
local_params: | ||
- { "prop": "dir-data", "direct": "OUT", "type": "FILE", "value": "data" } | ||
- { "prop": "file-text", "direct": "OUT", "type": "FILE", "value": "data/test2/text.txt" } | ||
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- name: input_dir | ||
task_type: Shell | ||
deps: [output] | ||
command: | | ||
tree . | ||
cat input_dir/test1/text.txt | ||
cat input_dir/test2/text.txt | ||
local_params: | ||
- { "prop": "input_dir", "direct": "IN", "type": "FILE", "value": "output.dir-data" } | ||
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- name: input_file | ||
task_type: Shell | ||
deps: [output] | ||
command: | | ||
tree . | ||
cat input.txt | ||
local_params: | ||
- { "prop": "input.txt", "direct": "IN", "type": "FILE", "value": "output.file-text" } | ||
``` | ||
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# 文件参数 | ||
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通过配置文件参数,在同一工作流实例中,可以将上游任务工作目录下的文件(或文件夹,下统一以**文件**代替)传递给下游任务。 如以下场景可能使用到 | ||
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- 在ETL任务中,将多个上游任务处理好的数据文件一起传递给特定的下游任务。 | ||
- 在机器学习场景中,将上游数据准备任务的数据集文件传递给下游模型训练任务。 | ||
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## 使用方式 | ||
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### 配置文件参数 | ||
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文件参数配置方式如下:在任务定义页面,点击“自定义参数”右边的加号,即可进行配置。 | ||
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### 输出文件给下游任务 | ||
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**自定义参数四个选项分别为:** | ||
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- 参数名:任务间传递时使用的标识,如下图中使用的`KEY1`和`KEY2` | ||
- 方向:OUT, 则表示输出文件给下游任务 | ||
- 参数类型:FILE, 表示文件参数 | ||
- 参数值:输出的文件路径,如下图中的`data`和`data/test2/text.txt` | ||
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下图的配置表示任务`output`向下游任务传递两个文件数据,分别为: | ||
- 传出文件夹 `data`, 并标记为`dir-data`, 下游任务可以通过`output.dir-data`获取该文件夹 | ||
- 传出文件 `data/test2/text.txt`, 并标记为`file-text`, 下游任务可以通过`output.file-text`获取该文件夹 | ||
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![img.png](../../../../img/new_ui/dev/parameter/file_parameter_output.png) | ||
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### 获取上游任务的文件 | ||
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**自定义参数四个选项分别为:** | ||
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- 参数名:上游文件输入后保存的位置,如下图中使用的`input_dir` | ||
- 方向:IN, 则表示从上游任务获取文件 | ||
- 参数类型:FILE, 表示文件参数 | ||
- 参数值:上游文件的标识,为 `taskName.KEY` 的格式 如下图中的`output.dir-data`, 其中`output`为上游任务的名称,`dir-data`为上游任务中输出的文件标识 | ||
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下图的配置表示任务从上游任务`output`中获取标识为`dir-data`的文件夹,并保存为`input_dir` | ||
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![img.png](../../../../img/new_ui/dev/parameter/file_parameter_input_dir.png) | ||
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下图的配置表示任务从上游任务`output`中获取标识为`file-text`的文件,并保存为`input.txt` | ||
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![img.png](../../../../img/new_ui/dev/parameter/file_parameter_input_file.png) | ||
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## 其他 | ||
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### 备注 | ||
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- 上下游任务间的文件传递基于资源中心作为中转,数据保存在资源中心`DATA_TRANSFER`的目录下, 因此**必须开启资源中心功能**,详情请参考[资源中心配置详情](../resource/configuration.md), 否则无法使用文件参数功能。 | ||
- 文件命名规则为 `DATA_TRANSFER/日期/工作流Code/工作流版本_工作流实例ID/任务名称_任务实例ID_文件名` | ||
- 若传输的文件数据为文件夹,则会打包成后缀为`.zip`的压缩文件再上传,下游任务接到后会解压并保存在对应目录 | ||
- 若需要删除文件数据,可以在资源中心的`DATA_TRANSFER`目录下删除对应文件夹即可, 如直接按照日期子目录删除,会删除该日期下所有的文件数据 | ||
- 如果存在任务链 task1->task2->tas3, 则最下游任务task3也能获取task1的文件数据 | ||
- 支持一对多传输以及多对一传输 | ||
- 如果频繁大量传输文件,毫无疑问会因传输的数据量影响到系统IO性能 | ||
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### 样例 | ||
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你可以保存以下YAML文件到本地,然后执行`pydolphinscheduler yaml -f data-transfer.yaml`即可运行Demo. | ||
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```yaml | ||
# Define the workflow | ||
workflow: | ||
name: "data-transfer" | ||
run: true | ||
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# Define the tasks under the workflow | ||
tasks: | ||
- name: output | ||
task_type: Shell | ||
command: | | ||
mkdir -p data/test1 data/test2 | ||
echo "test1 message" >> data/test1/text.txt | ||
echo "test2 message" >> data/test2/text.txt | ||
tree . | ||
local_params: | ||
- { "prop": "dir-data", "direct": "OUT", "type": "FILE", "value": "data" } | ||
- { "prop": "file-text", "direct": "OUT", "type": "FILE", "value": "data/test2/text.txt" } | ||
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- name: input_dir | ||
task_type: Shell | ||
deps: [output] | ||
command: | | ||
tree . | ||
cat input_dir/test1/text.txt | ||
cat input_dir/test2/text.txt | ||
local_params: | ||
- { "prop": "input_dir", "direct": "IN", "type": "FILE", "value": "output.dir-data" } | ||
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- name: input_file | ||
task_type: Shell | ||
deps: [output] | ||
command: | | ||
tree . | ||
cat input.txt | ||
local_params: | ||
- { "prop": "input.txt", "direct": "IN", "type": "FILE", "value": "output.file-text" } | ||
``` | ||
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