MRS Spark Python

Function

The MRS Spark Python node is used to execute a predefined Spark Python job on MRS.

For details about how to use the MRS Spark Python operator, see Developing an MRS Spark Python Job.

Parameters

Table 1, Table 2, and Table 3 describe the parameters of the MRS Spark Python node.

**Table 1** Parameters of MRS Spark Python nodes
Parameter	Mandatory	Description
Node Name	Yes	Name of the node. The value must consist of 1 to 128 characters and contain only letters, digits, and the following special characters: _-/<>
MRS Cluster Name	Yes	Select an MRS cluster that supports Spark Python. Only a specific version of MRS supports Spark Python. Test the cluster first to ensure that it supports Spark Python. To create an MRS cluster, use either of the following methods: Click . On the Clusters page, create an MRS cluster. Go to the MRS console to create an MRS cluster. For details about how to create a cluster, see section "Custom Purchase of a Cluster" in MapReduce Service (MRS) Usage Guide .
Job Name	Yes	Name of an MRS job. The name contains 1 to 64 characters, including only letters, digits, and underscores (_). NOTE: The job name cannot contain more than 64 characters. If the job name does not meet requirements, the MRS job will fail to be submitted.
Parameter	Yes	Enter the parameters of the executable program of MRS. Use Enter to separate multiple parameters.
Attribute	No	Enter parameters in the key=value format. Use Enter to separate multiple parameters.

**Table 2** Advanced parameters
Parameter	Mandatory	Description
Max. Node Execution Duration	Yes	Maximum duration of executing a node. When Retry upon Failure is set to Yes for a node, the node can be re-executed for numerous times upon an execution failure within the maximum duration.
Retry upon Failure	Yes	Whether to re-execute a node after the node fails to be executed. Yes: The node will be re-executed after it fails to be executed. The following parameters must be configured: Maximum Retries Retry Interval (seconds) No: The node will not be re-executed. This is the default setting. NOTE: If Max. Node Execution Duration is configured for the node, the node will not be executed again after the execution times out. Instead, the node is set to the failure state.
Failure Policy	Yes	Policies to be performed after the node fails to be executed: End the current job execution plan: stops running the current job. The job instance status is Failed. Go to the next node: ignores the execution failure of the current node. The job instance status is Failure ignored. Suspend current job execution plan: suspends running the current job. The job instance status is Waiting. Suspend execution plans of the subsequent nodes: stops running subsequent nodes. The job instance status is Failed.
Dry run	No	If you select this option, the node will not be executed, and a success message will be returned.

**Table 3** Lineage
Parameter	Description
Input
Add	Click Add. In the Type drop-down list, select the type to be created. The value can be DWS, OBS, CSS, HIVE, DLI, or CUSTOM. DWS Connection Name: Click . In the displayed dialog box, select a DWS data connection. Database: Click . In the displayed dialog box, select a DWS database. Schema: Click . In the displayed dialog box, select a DWS schema. Table Name: Click . In the displayed dialog box, select a DWS table. OBS Path: Click . In the displayed dialog box, select an OBS path. CSS Cluster Name: Click . In the displayed dialog box, select a CSS cluster. Index: Enter a CSS index name. HIVE Connection Name: Click . In the displayed dialog box, select a HIVE data connection. Database: Click . In the displayed dialog box, select a HIVE database. Table Name: Click . In the displayed dialog box, select a HIVE table. CUSTOM Name: Enter a name of the CUSTOM type. Attribute: Enter an attribute of the CUSTOM type. You can add more than one attribute. DLI Connection Name: Click . In the displayed dialog box, select a DLI data connection. Database: Click . In the displayed dialog box, select a DLI database. Table Name: Click . In the displayed dialog box, select a DLI table.
OK	Click OK to save the parameter settings.
Cancel	Click Cancel to cancel the parameter settings.
Modify	Click to modify the parameter settings. After the modification, save the settings.
Delete	Click to delete the parameter settings.
View Details	Click to view details about the table created based on the input lineage.
Output
Add	Click Add. In the Type drop-down list, select the type to be created. The value can be DWS, OBS, CSS, HIVE, DLI, or CUSTOM. DWS Connection Name: Click . In the displayed dialog box, select a DWS data connection. Database: Click . In the displayed dialog box, select a DWS database. Schema: Click . In the displayed dialog box, select a DWS schema. Table Name: Click . In the displayed dialog box, select a DWS table. OBS Path: Click . In the displayed dialog box, select an OBS path. CSS Cluster Name: Click . In the displayed dialog box, select a CSS cluster. Index: Enter a CSS index name. HIVE Connection Name: Click . In the displayed dialog box, select a HIVE data connection. Database: Click . In the displayed dialog box, select a HIVE database. Table Name: Click . In the displayed dialog box, select a HIVE table. CUSTOM Name: Enter a name of the CUSTOM type. Attribute: Enter an attribute of the CUSTOM type. You can add more than one attribute. DLI Connection Name: Click . In the displayed dialog box, select a DLI data connection. Database: Click . In the displayed dialog box, select a DLI database. Table Name: Click . In the displayed dialog box, select a DLI table.
OK	Click OK to save the parameter settings.
Cancel	Click Cancel to cancel the parameter settings.
Modify	Click to modify the parameter settings. After the modification, save the settings.
Delete	Click to delete the parameter settings.
View Details	Click to view details about the table created based on the output lineage.