- Product Introduction
- Purchase Guide
- Getting Started
- Operation Guide
- Development Guide
- Client Access
- Practical Tutorial
- SQL Statement
- SuperSQL Statement
- Overview of SuperSQL Statement
- Unified Statement
- Common Data Types
- DDL Statement
- CREATE DATABASE
- SHOW DATABASES
- DESCRIBE DATABASE
- ALTER DATABASE
- DROP DATABASE
- CREATE TABLE
- REPLACE TABLE AS SELECT
- SHOW TABLES
- SHOW CREATE TABLE
- SHOW TBLPROPERTIES
- DESCRIBE TABLE
- SHOW COLUMNS IN TABLE
- ALTER TABLE
- ALTER TABLE ADD COLUMNS
- ALTER TABLE ADD COLUMN AFTER/FIRST
- ALTER TABLE DROP COLUMN
- ALTER TABLE ADD PARTATION
- SHOW PARTITIONS
- ALTER TABLE DROP PARTITION
- ALTER TABLE ADD PARTITION FIELD
- ALTER TABLE DROP PARTITION FIELD
- ALTER TABLE ... RENAME COLUMN
- ALTER TABLE SET TBLPROPERTIES
- ALTER TABLE SET LOCATION
- ALTER TABLE ... WRITE ORDERED BY
- ALTER TABLE ... WRITE DISTRIBUTED BY PARTITION
- ALTER TABLE ... SET IDENTIFIER FIELDS
- ALTER TABLE ... DROP IDENTIFIER FIELDS
- MSCK REPAIR TABLE
- ANALYZE TABLES
- DROP TABLE
- EXPLAIN
- CALL STATEMENT
- CREATE VIEW AS
- SHOW VIEWS
- DESCRIBE VIEW
- SHOW CREATE VIEW
- SHOW COLUMNS IN VIEW
- ALTER VIEW
- DROP VIEW
- CREATE FUNCTION
- SHOW FUNCTION
- DROP FUNCTION
- DML Statement
- DQL Statement
- Iceberg Table Statement
- Materialized View Statement
- SQL Implicit Conversion
- Functions
- Overview of Standard Spark Statement
- Overview of Standard Presto Statement
- Reserved Words
- SuperSQL Statement
- API Documentation
- History
- Introduction
- API Category
- Making API Requests
- Data Table APIs
- Task APIs
- CreateSparkSessionBatchSQL
- CancelSparkSessionBatchSQL
- CancelTask
- CreateResultDownload
- CreateSparkAppTask
- CreateTask
- CreateTasks
- DeleteSparkApp
- DescribeEngineUsageInfo
- DescribeResultDownload
- DescribeSparkAppTasks
- DescribeTaskResult
- DescribeTasks
- QueryTaskCostDetail
- CreateSparkApp
- DescribeSparkAppJob
- DescribeSparkSessionBatchSqlLog
- ModifySparkApp
- DescribeSparkAppJobs
- ModifySparkAppBatch
- DescribeTaskStatistics
- DescribeQuery
- DescribeJobs
- DescribeJob
- Metadata APIs
- Service Configuration APIs
- CreateCHDFSBindingProduct
- DeleteCHDFSBindingProduct
- DescribeOtherCHDFSBindingList
- CreateStoreLocation
- DescribeStoreLocation
- ModifyDataEngineDescription
- RollbackDataEngineImage
- SwitchDataEngine
- SwitchDataEngineImage
- UpgradeDataEngineImage
- DeleteThirdPartyAccessUser
- DescribeDataEngineImageVersions
- DescribeSubUserAccessPolicy
- DescribeThirdPartyAccessUser
- RegisterThirdPartyAccessUser
- RestartDataEngine
- UpdateUserDataEngineConfig
- UpdateDataEngineConfig
- Permission Management APIs
- AddUsersToWorkGroup
- AttachUserPolicy
- AttachWorkGroupPolicy
- BindWorkGroupsToUser
- CreateUser
- CreateWorkGroup
- DeleteUser
- DeleteUsersFromWorkGroup
- DeleteWorkGroup
- DescribeUserInfo
- DescribeUserRoles
- DescribeUserType
- DescribeUsers
- DescribeWorkGroupInfo
- DescribeWorkGroups
- DetachUserPolicy
- DetachWorkGroupPolicy
- ModifyUser
- ModifyUserType
- ModifyWorkGroup
- UnbindWorkGroupsFromUser
- UpdateRowFilter
- CheckGrantedPermission
- Database APIs
- Data Source Connection APIs
- Data Optimization APIs
- Data Engine APIs
- Data Types
- Error Codes
- General Reference
- DLC Policy
- Service Level Agreement
- Contact Us
- Product Introduction
- Purchase Guide
- Getting Started
- Operation Guide
- Development Guide
- Client Access
- Practical Tutorial
- SQL Statement
- SuperSQL Statement
- Overview of SuperSQL Statement
- Unified Statement
- Common Data Types
- DDL Statement
- CREATE DATABASE
- SHOW DATABASES
- DESCRIBE DATABASE
- ALTER DATABASE
- DROP DATABASE
- CREATE TABLE
- REPLACE TABLE AS SELECT
- SHOW TABLES
- SHOW CREATE TABLE
- SHOW TBLPROPERTIES
- DESCRIBE TABLE
- SHOW COLUMNS IN TABLE
- ALTER TABLE
- ALTER TABLE ADD COLUMNS
- ALTER TABLE ADD COLUMN AFTER/FIRST
- ALTER TABLE DROP COLUMN
- ALTER TABLE ADD PARTATION
- SHOW PARTITIONS
- ALTER TABLE DROP PARTITION
- ALTER TABLE ADD PARTITION FIELD
- ALTER TABLE DROP PARTITION FIELD
- ALTER TABLE ... RENAME COLUMN
- ALTER TABLE SET TBLPROPERTIES
- ALTER TABLE SET LOCATION
- ALTER TABLE ... WRITE ORDERED BY
- ALTER TABLE ... WRITE DISTRIBUTED BY PARTITION
- ALTER TABLE ... SET IDENTIFIER FIELDS
- ALTER TABLE ... DROP IDENTIFIER FIELDS
- MSCK REPAIR TABLE
- ANALYZE TABLES
- DROP TABLE
- EXPLAIN
- CALL STATEMENT
- CREATE VIEW AS
- SHOW VIEWS
- DESCRIBE VIEW
- SHOW CREATE VIEW
- SHOW COLUMNS IN VIEW
- ALTER VIEW
- DROP VIEW
- CREATE FUNCTION
- SHOW FUNCTION
- DROP FUNCTION
- DML Statement
- DQL Statement
- Iceberg Table Statement
- Materialized View Statement
- SQL Implicit Conversion
- Functions
- Overview of Standard Spark Statement
- Overview of Standard Presto Statement
- Reserved Words
- SuperSQL Statement
- API Documentation
- History
- Introduction
- API Category
- Making API Requests
- Data Table APIs
- Task APIs
- CreateSparkSessionBatchSQL
- CancelSparkSessionBatchSQL
- CancelTask
- CreateResultDownload
- CreateSparkAppTask
- CreateTask
- CreateTasks
- DeleteSparkApp
- DescribeEngineUsageInfo
- DescribeResultDownload
- DescribeSparkAppTasks
- DescribeTaskResult
- DescribeTasks
- QueryTaskCostDetail
- CreateSparkApp
- DescribeSparkAppJob
- DescribeSparkSessionBatchSqlLog
- ModifySparkApp
- DescribeSparkAppJobs
- ModifySparkAppBatch
- DescribeTaskStatistics
- DescribeQuery
- DescribeJobs
- DescribeJob
- Metadata APIs
- Service Configuration APIs
- CreateCHDFSBindingProduct
- DeleteCHDFSBindingProduct
- DescribeOtherCHDFSBindingList
- CreateStoreLocation
- DescribeStoreLocation
- ModifyDataEngineDescription
- RollbackDataEngineImage
- SwitchDataEngine
- SwitchDataEngineImage
- UpgradeDataEngineImage
- DeleteThirdPartyAccessUser
- DescribeDataEngineImageVersions
- DescribeSubUserAccessPolicy
- DescribeThirdPartyAccessUser
- RegisterThirdPartyAccessUser
- RestartDataEngine
- UpdateUserDataEngineConfig
- UpdateDataEngineConfig
- Permission Management APIs
- AddUsersToWorkGroup
- AttachUserPolicy
- AttachWorkGroupPolicy
- BindWorkGroupsToUser
- CreateUser
- CreateWorkGroup
- DeleteUser
- DeleteUsersFromWorkGroup
- DeleteWorkGroup
- DescribeUserInfo
- DescribeUserRoles
- DescribeUserType
- DescribeUsers
- DescribeWorkGroupInfo
- DescribeWorkGroups
- DetachUserPolicy
- DetachWorkGroupPolicy
- ModifyUser
- ModifyUserType
- ModifyWorkGroup
- UnbindWorkGroupsFromUser
- UpdateRowFilter
- CheckGrantedPermission
- Database APIs
- Data Source Connection APIs
- Data Optimization APIs
- Data Engine APIs
- Data Types
- Error Codes
- General Reference
- DLC Policy
- Service Level Agreement
- Contact Us
To ensure stable operation of Spark engine query analysis when network bandwidth is limited (e.g. during storage system throttling), the DLC Spark engine provides a local cache capability. When you need to cache table data, you can quickly enable caching by adding engine configuration.
Directions
1. Create a Spark Engine: For details, see Purchase Exclusive Data Engine.
2. Add Cache Configuration: Go to the DLC Console > Data Engine. Select the engine created in Step 1, click Parameter Configuration, and add the configuration items from Cache Configuration Item Explanation.
Spark SQL Engine Configuration:
Note:
After the configuration is added, the engine cluster will restart. It is recommended to enable the cache when no tasks are running to avoid affecting ongoing tasks.
3. To use the engine cache, go to Data Exploration, write the query SQL in the SQL interface, select the engine with the cache enabled, and execute the SQL. Once executed, the engine will cache the DLC external table data locally. When the SQL is executed again, the data will be fetched from the local cache, improving query efficiency.
Spark SQL Engine Query:
Spark Batch Engine Query:
Cache Description
Cache Configuration Items Description
Configuration Items | Configuration Values | Configuration Items Description |
spark.hadoop.fs.cosn.impl | alluxio.hadoop.ShimFileSystem | Fixed value; the configuration value is the cache implementation class. Configure this value to enable the cache feature. If the cache feature is enabled, configuring a value other than this will result in the engine not being able to access COS data. Please follow the instructions carefully. If you need to disable the cache after enabling it, please delete this configuration item. |
Cache Usage Instructions
1. Engine Type Description
SparkSQL Engine: When the engine restarts, the cached data becomes invalid because it is a local cache.
SparkBatch Engine: The SparkBatch engine runs tasks at the session level. Once the task execution is complete, the cached data becomes invalid.
2. Table Type Description
Currently, only DLC external tables are cached.
Yes
No
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