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On this page

Creating a Hudi Task
Querying Hudi Synchronization Tasks
Suspending Hudi Synchronization Tasks
Resuming Hudi Synchronization Tasks
Deleting a Hudi Synchronization Task
Querying Past Synchronization Information
Querying the Status of a Synchronization Task
Resetting a Hudi Synchronization Task with Consecutive Failures

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Help Center/ GaussDB(DWS)/ Developer Guide/ Standard data warehouse (9.1.0.x)/ GaussDB(DWS) Data Query/ SQL on Hudi/ Synchronizing Hudi Tasks

Synchronizing Hudi Tasks

Updated on 2024-12-18 GMT+08:00

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Creating a Hudi Task

Migration

If data has been imported to the GaussDB(DWS) table using CDL, use SQL on Hudi to migrate data. Alternatively, use CDM to perform full initialization and then use SQL on Hudi to synchronize incremental data.

To create the hudi.hudi_sync_state synchronization status table, you must have the administrator permission.
1

SELECT pg_catalog.create_hudi_sync_table();
Generally, hudi.hudi_sync_state is created only once in each database.

To set the CDL synchronization progress, you must have the INSERT and UPDATE permissions on the target table and the SELECT permission on the HUDI foreign table. Otherwise, the synchronization progress cannot be set.

      
         SELECT hudi_set_sync_commit('SCHEMA.TABLE', 'SCHEMA.FOREIGN_TABLE', 'LATEST_COMMIT');

Where:

SCHEMA.TABLE indicates the name and schema of the target table for data synchronization.
SCHEMA.FOREIGN_TABLE indicates the name and schema of the OBS foreign table.
LATEST_COMMIT indicates the end time of the Hudi synchronization.

Example: Data has been synchronized to the target table public.in_rel from hudi by 20220913152131. Use SQL on Hudi to continue to export data from the OBS foreign table hudi_read1.

      
         SELECT hudi_set_sync_commit('public.in_rel', 'public.hudi_read1', '20220913152131');

Submit the Hudi synchronization task.
1

SELECT hudi_sync_task_submit('SCHEMA.TABLE', 'SCHEMA.FOREIGN_TABLE');
Example: Use SQL on Hudi to continue to export data from the OBS foreign table hudi_read1 to the target table public.in_rel.
1

SELECT hudi_sync_task_submit('public.in_rel', 'public.hudi_read1');

Creation

If the GaussDB(DWS) table is empty and data is synchronized from Hudi for the first time, run the following command to create a task:

   
      SELECT hudi_sync_task_submit('SCHEMA.TABLE', 'SCHEMA.FOREIGN_TABLE');

Querying Hudi Synchronization Tasks

Query a Hudi synchronization task. In the query result, task_id uniquely identifies a Hudi synchronization task.

    
       SELECT * FROM pg_task_show('SQLonHudi');

Suspending Hudi Synchronization Tasks

Query the Hudi task and obtain task_id to suspend the Hudi task.

    
       SELECT pg_task_pause('task_id');

Example:

Suspend the synchronization task whose task_id is 64479410-a04c-0700-d150-3037d700fffe.

    
       SELECT pg_task_pause('64479410-a04c-0700-d150-3037d700fffe');

Resuming Hudi Synchronization Tasks

Query the Hudi task, obtain the value of task_id, and resume the Hudi task.

    
       SELECT pg_task_resume('task_id');

Example:

Resume the synchronization task whose task_id is 64479410-a04c-0700-d150-3037d700fffe.

    
       SELECT pg_task_resume('64479410-a04c-0700-d150-3037d700fffe');

Deleting a Hudi Synchronization Task

Query the Hudi task, obtain task_id, and delete the Hudi synchronization task.

    
       SELECT pg_task_remove('task_id');

Example:

Delete the synchronization task whose task_id is 64479410-a04c-0700-d150-3037d700fffe.

    
       SELECT pg_task_remove('64479410-a04c-0700-d150-3037d700fffe');

Querying Past Synchronization Information

Use the hudi_sync_state_history_view view to query information about past Hudi synchronization tasks. This view is supported only by clusters of version 9.1.0 and later.

    
       SELECT * FROM pg_catalog.hudi_sync_state_history_view;

**Table 1** **hudi_sync_state_history_view** columns
Column	Type	Description
task_id	TEXT	Task ID
target_tbl	TEXT	Name of the synchronization target table
source_ftbl	TEXT	Name of the synchronization source table (foreign table)
latest_commit	TEXT	Timestamp of the latest successful synchronization
latest_sync_count	BIGINT	Number of rows that are successfully synchronized last time
latest_sync_start	TIMESTAMP WITH TIME ZONE	Start time of the latest synchronization task
latest_sync_end	TIMESTAMP WITH TIME ZONE	Time when the latest synchronization task ends
hudi_flushdisk_time	TEXT	Time when the hudi file is flushed to disks

Querying the Status of a Synchronization Task

Use the hudi_show_sync_state() function to query the status of a Hudi synchronization task.

    
       SELECT * FROM hudi_show_sync_state();

Resetting a Hudi Synchronization Task with Consecutive Failures

Use the pg_task_resume() function to reset a Hudi synchronization task that fails consecutively.

If the number of consecutive failures is greater than or equal to 10, the task is automatically suspended. You need to manually call the pg_task_resume() function to reset the task. This function is supported only by clusters of version 9.1.0 and later.

Input parameter: task_id of the Hudi task that fails consecutively

    
       SELECT pg_task_resume('task_id');

Parent topic: SQL on Hudi

Previous topic: Creating a Hudi Data Description (Foreign Table)

Next topic: Querying a Hudi Foreign Table

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