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- What's New
- Function Overview
- Service Overview
- Getting Started
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User Guide
- Permissions Management
- Supported Data Sources
- Creating and Managing a CDM Cluster
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Creating a Link in a CDM Cluster
- Creating a Link Between CDM and a Data Source
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Configuring Link Parameters
- OBS Link Parameters
- PostgreSQL/SQLServer Link Parameters
- GaussDB(DWS) Link Parameters
- RDS for MySQL/MySQL Database Link Parameters
- Oracle Database Link Parameters
- DLI Link Parameters
- Hive Link Parameters
- HBase Link Parameters
- HDFS Link Parameters
- FTP/SFTP Link Parameters
- Redis Link Parameters
- DDS Link Parameters
- CloudTable Link Parameters
- MongoDB Link Parameters
- Cassandra Link Parameters
- DIS Link Parameters
- Kafka Link Parameters
- DMS Kafka Link Parameters
- CSS Link Parameters
- Elasticsearch Link Parameters
- Dameng Database Link Parameters
- SAP HANA Link Parameters
- Shard Link Parameters
- MRS Hudi Link Parameters
- MRS ClickHouse Link Parameters
- ShenTong Database Link Parameters
- LogHub (SLS) Link Parameters
- Doris Link Parameters
- YASHAN Link Parameters
- Uploading a CDM Link Driver
- Creating a Hadoop Cluster Configuration
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Creating a Job in a CDM Cluster
- Table/File Migration Jobs
- Creating an Entire Database Migration Job
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Configuring CDM Source Job Parameters
- From OBS
- From HDFS
- From HBase/CloudTable
- From Hive
- From DLI
- From FTP/SFTP
- From HTTP
- From PostgreSQL/SQL Server
- From DWS
- From SAP HANA
- From MySQL
- From Oracle
- From a Database Shard
- From MongoDB/DDS
- From Redis
- From DIS
- From Kafka/DMS Kafka
- From Elasticsearch or CSS
- From MRS Hudi
- From MRS ClickHouse
- From a Dameng Database
- From LogHub (SLS)
- From a ShenTong Database
- From Doris
- From YASHAN
- Configuring CDM Destination Job Parameters
- Configuring CDM Job Field Mapping
- Configuring a Scheduled CDM Job
- Managing CDM Job Configuration
- Managing a CDM Job
- Managing CDM Jobs
- Viewing Traces
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Key Operation Guide
- Incremental Migration
- Using Macro Variables of Date and Time
- Migration in Transaction Mode
- Encryption and Decryption During File Migration
- MD5 Verification
- Configuring Field Converters
- Adding Fields
- Migrating Files with Specified Names
- Regular Expressions for Separating Semi-structured Text
- Recording the Time When Data Is Written to the Database
- File Formats
- Converting Unsupported Data Types
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Tutorials
- Creating an MRS Hive Link
- Creating a MySQL Link
- Migrating Data from MySQL to MRS Hive
- Migrating Data from MySQL to OBS
- Migrating Data from MySQL to DWS
- Migrating an Entire MySQL Database to RDS
- Migrating Data from Oracle to CSS
- Migrating Data from Oracle to DWS
- Migrating Data from OBS to CSS
- Migrating Data from OBS to DLI
- Migrating Data from MRS HDFS to OBS
- Migrating the Entire Elasticsearch Database to CSS
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Best Practices
-
Tutorials
- Creating an MRS Hive Link
- Creating a MySQL Link
- Migrating Data from MySQL to MRS Hive
- Migrating Data from MySQL to OBS
- Migrating Data from MySQL to DWS
- Migrating an Entire MySQL Database to RDS
- Migrating Data from Oracle to CSS
- Migrating Data from Oracle to DWS
- Migrating Data from OBS to CSS
- Migrating Data from OBS to DLI
- Migrating Data from MRS HDFS to OBS
- Migrating the Entire Elasticsearch Database to CSS
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Advanced Data Migration Guidance
- Incremental Migration
- Using Macro Variables of Date and Time
- Migration in Transaction Mode
- Encryption and Decryption During File Migration
- MD5 Verification
- Configuring Field Converters
- Migrating Files with Specified Names
- Regular Expressions for Separating Semi-structured Text
- Recording the Time When Data Is Written to the Database
- File Formats
- Scheduling a CDM Job by Transferring Parameters Using DataArts Factory
- Enabling Incremental Data Migration Through DataArts Factory
- Creating Table Migration Jobs in Batches Using CDM Nodes
- Simplified Migration of Trade Data to the Cloud and Analysis
- Migration of IoV Big Data to the Lake Without Loss
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Tutorials
- Performance White Paper
- Security White Paper
- API Reference
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FAQs
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General
- What Are the Differences Between CDM and Other Data Migration Services?
- What Are the Advantages of CDM?
- What Are the Security Protection Mechanisms of CDM?
- How Do I Reduce the Cost of Using CDM?
- Will I Be Billed If My CDM Cluster Does Not Use the Data Transmission Function?
- Why Am I Billed Pay per Use When I Have Purchased a Yearly/Monthly CDM Incremental Package?
- How Do I Check the Remaining Validity Period of a Package?
- Will My Data Be Retained If My Package Expires or My Pay-per-Use Resources Are in Arrears?
- Can CDM Be Shared by Different Tenants?
- Can I Upgrade a CDM Cluster?
- How Is the Migration Performance of CDM?
- What Is the Number of Concurrent Jobs for Different CDM Cluster Versions?
- Can I Stop a CDM Cluster?
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Functions
- Does CDM Support Incremental Data Migration?
- Does CDM Support Field Conversion?
- What Component Versions Are Recommended for Migrating Hadoop Data Sources?
- What Data Formats Are Supported When the Data Source Is Hive?
- Can I Synchronize Jobs to Other Clusters?
- Can I Create Jobs in Batches?
- Can I Schedule Jobs in Batches?
- How Do I Back Up CDM Jobs?
- How Do I Configure the Connection If Only Some Nodes in the HANA Cluster Can Communicate with the CDM Cluster?
- How Do I Use Java to Invoke CDM RESTful APIs to Create Data Migration Jobs?
- How Do I Connect the On-Premises Intranet or Third-Party Private Network to CDM?
- Does CDM Support Parameters or Variables?
- How Do I Set the Number of Concurrent Extractors for a CDM Migration Job?
- Does CDM Support Real-Time Migration of Dynamic Data?
- Can I Stop CDM Clusters?
- How Do I Obtain the Current Time Using an Expression?
- What Is the Time Format for the Where Clause Parameters for Creating a Migration Job?
- Can CDM Migrate Field Comments from a Source Table to a Destination Table?
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Troubleshooting
- What Should I Do If the Log Prompts that the Date Format Fails to Be Parsed?
- What Can I Do If the Map Field Tab Page Cannot Display All Columns?
- How Do I Select Distribution Columns When Using CDM to Migrate Data to DWS?
- What Do I Do If the Error Message "value too long for type character varying" Is Displayed When I Migrate Data to DWS?
- What Can I Do If Error Message "Unable to execute the SQL statement" Is Displayed When I Import Data from OBS to SQL Server?
- What Should I Do If the Cluster List Is Empty, I Have No Access Permission, or My Operation Is Denied?
- Why Is Error ORA-01555 Reported During Migration from Oracle to DWS?
- What Should I Do If the MongoDB Connection Migration Fails?
- What Should I Do If a Hive Migration Job Is Suspended for a Long Period of Time?
- What Should I Do If an Error Is Reported Because the Field Type Mapping Does Not Match During Data Migration Using CDM?
- What Should I Do If a JDBC Connection Timeout Error Is Reported During MySQL Migration?
- What Should I Do If a CDM Migration Job Fails After a Link from Hive to DWS Is Created?
- How Do I Use CDM to Export MySQL Data to an SQL File and Upload the File to an OBS Bucket?
- What Should I Do If CDM Fails to Migrate Data from OBS to DLI?
- What Should I Do If Error Message "Configuration Item [linkConfig.createBackendLinks] Does Not Exist" Is Displayed During Data Link Creation or Error Message "Configuration Item [throttlingConfig.concurrentSubJobs] Does Not Exist" Is Displayed During Job Creation?
- What Should I Do If Message "CORE_0031:Connect time out. (Cdm.0523)" Is Displayed During the Creation of an MRS Hive Link?
- What Should I Do If Message "CDM Does Not Support Auto Creation of an Empty Table with No Column" Is Displayed When I Enable Auto Table Creation?
- What Should I Do If I Cannot Obtain the Schema Name When Creating an Oracle Relational Database Migration Job?
- What Should I Do If invalid input syntax for integer: "true" Is Displayed During MySQL Database Migration?
- What Should I Do If the Migration Source Is Oracle and Error Message "snapshot too old" Is Displayed?
- What Should I Do If Error "Identifier name is too long" Is Reported During Entire DB Migration to Hive?
- What Should I Do If Data Is Lost During Migration to DLI?
- What Should I Do If the Oracle Link Connectivity Test Is Successful on the Link Creation Page but Fails on the Links Page?
- What Should I Do If Destination Fields Are Not Displayed When Auto Table Creation Is Enabled in the Destination Job Configuration?
- What Should I Do If a Job Exported from a Cluster Fails to Be Imported to Another Cluster?
- What Should I Do If an Error Message Is Displayed Indicating that the Block Is Missing During HDFS File Migration?
- What Should I Do If the CDM Job Management Page Cannot Be Accessed and a Message Is Displayed Indicating that the Network or Server Cannot Be Accessed?
- What Should I Do If a CDM Cluster of Version 2.8.6 Fails to Migrate Data from OBS to DLI?
- What Should I Do If Error Message "Read timedout" Is Displayed During DWS Data Migration?
- What Should I Do If No Database or Table Information Can Be Obtained Through a Hive Link?
- What Should I Do If Error "get filesystem" Is Reported During the Creation of a FusionInsight HDFS Link?
- What Should I Do If Error "Invoke DLI service api failed" Is Reported When the Data Migration from MySQL to DLI Is About to Complete?
- What Should I Do If a MongoDB Field Fails to Be Migrated to the Destination?
- What Should I Do If a Field Is Escaped and Contains a Backslash (\) During the Migration of a DLI Foreign Table (OBS File) to DWS?
- What Should I Do If "Error occurs during loader run" Is Reported During Migration from PostgreSQL to Hive?
- What Should I Do If Error Message "Lost connection to MySQL server during query" Is Displayed During Migration from MySQL to DWS?
- What Should I Do If Error Message "For input string: "false" Is Displayed During Field Type Conversion During MySQL-to-DLI Migration?
- What Should I Do If an Error Occurs During the Migration of TINYINT Data from MySQL to DWS?
- What Shoud I Do If the Data Volume Is Inconsistent Before and After Data Migration?
- What Should I Do If an Error Is Reported Indicating an Incorrect Username or Password During Link Creation but They Are Correct Indeed?
- What Should I Do If a Message Is Displayed Indicating that the Fields in the Lower Camel Case Do Not Exist During Data Migration from a Database to OBS?
- What Should I Do If Error "invalid utf-8 character string" Is Reported When CSV Data Is Inserted into the MySQL Database?
- What Should I Do If a Scheduled Job Fails and Link Connectivity Is Abnormal?
- What Should I Do If CSV Data Fails to Be Inserted into a MySQL Database?
- What Should I Do If Error "timeout waiting for connection from pool" Is Reported During ES Writing?
- Why Is Error ORA-01555 Reported During Migration from Oracle to DWS?
- What Shoud I Do If the FTP Connectivity Test Fails and an Internal Server Error Is Reported?
- What Should I Do If All Users Except User root Cannot Access RDS for MySQL?
- Hudi Source Case Library
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Hudi Destination Case Library
- What Should I Do If the Auto Creation of the Hudi Table Fails Due to a Schema Mismatch?
- What Should I Do If a Hudi Job Stays in Booting Status for a Long Time and then Fails and the "Read timed out" Error Is Contained in the Log?
- What Should I Do If the Number of Read Rows Is the Same as That of Write Rows, Both Numbers No Longer Increase, and the Job Stays in Running State?
- What Should I Do If a Job Stays in Running State but the Number of Written Rows Is 0?
- What Should I Do If Data Fails to Be Written to Hudi Using Spark SQL?
- What Should I Do If a Job Fails Due to Intermittent Disconnection, Timeout, or Connection Termination of the Source Link?
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General
- General Reference
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Migrating the Entire Elasticsearch Database to CSS
Scenario
CSS provides users with structured and unstructured data search, statistics, and report capabilities. This section describes how to use CDM to migrate the entire Elasticsearch database to Cloud Search Service. The procedure is as follows:
Prerequisites
- You have sufficient EIP quota.
- You have subscribed to CSS and obtained the IP address and port number of the CSS cluster.
- You have obtained the IP address, port number, username, and password of the on-premises Elasticsearch database server.
If the Elasticsearch server is deployed on an on-premises data center or a third-party cloud, ensure that an IP address that can be accessed from the public network has been configured for the Elasticsearch server, or the VPN or Direct Connect between the on-premises data center and HUAWEI CLOUD has been established.
Creating a CDM Cluster and Binding an EIP to the Cluster
- If CDM is used an independent service, create a CDM cluster by following the instructions in Creating a CDM Cluster. If CDM is used as a module of DataArts Studio, create a CDM cluster by following the instructions in Creating a CDM Cluster.
The key configurations are as follows:
- The flavor of the CDM cluster is selected based on the amount of data to be migrated. Generally, cdm.medium meets the requirements for most migration scenarios.
- The CDM and Cloud Search Service clusters must be in the same VPC. In addition, it is recommended that the CDM cluster be in the same subnet and security group as the Cloud Search Service cluster.
- If the same subnet and security group cannot be used for security purposes, ensure that a security group rule has been configured to allow the CDM cluster to access the Cloud Search Service cluster.
- After the CDM cluster is created, on the Cluster Management page, click Bind EIP in the Operation column to bind an EIP to the cluster. The CDM cluster uses the EIP to access the on-premises Elasticsearch.
NOTE:
If SSL encryption is configured for the access channel of a local data source, CDM cannot connect to the data source using the EIP.
Creating a Cloud Search Service Link
- Click Job Management in the Operation column of the CDM cluster. On the displayed page, click the Links tab and then Create Link. The Select Connector page is displayed.
Figure 1 Selecting a connector
- Select Cloud Search Service and click Next. On the page that is displayed, configure the CSS link parameters.
- Name: Enter a custom link name, for example, csslink.
- Elasticsearch Server List: Enter the IP address and port number of the Cloud Search Service cluster (cluster later than 5.x). The format is ip:port. Use semicolons to separate multiple addresses. For example, 192.168.0.1:9200;192.168.0.2:9200.
- Username and Password: Enter the username and password used for logging in to the Cloud Search Service cluster. The user must have the read and write permissions on the database.
Figure 2 Creating a CSS link
- Click Save. The Link Management page is displayed.
Creating an Elasticsearch Link
- On the Cluster Management page, locate a cluster and click Job Management in the Operation column. On the displayed page, click the Links tab and then Create Link.
Figure 3 Selecting a connector type
- Select Elasticsearch and click Next to configure parameters for the Elasticsearch link. The parameters are the same as those for the CSS link.
- Name: Enter a custom link name, for example, es_link.
- Elasticsearch Server List: Enter the IP address and port number of the on-premises Elasticsearch database. Use semicolons to separate multiple addresses.
- Click Save. The Link Management page is displayed.
Creating an Entire DB Migration Job
- Choose Entire DB Migration > Create Job to create an entire DB migration job.
Figure 4 Creating an entire DB migration job
- Job Name: Enter a unique name.
- Source Job Configuration
- Source Link Name: Select the es_link link created in Creating an Elasticsearch Link.
- Index: Click the icon next to the text box to select an index in the on-premises Elasticsearch database or manually enter an index name. The name can contain only lowercase letters. If multiple indexes need to be migrated at a time, set this parameter to a wildcard character. CDM migrates all indexes that meet the wildcard condition. For example, if this parameter is set to cdm*, CDM migrates all indexes starting with cdm, such as cdm01, cdmB3, cdm_45 and so on.
- Destination Job Configuration
- Destination Link Name: Select the csslink link created in Creating a Cloud Search Service Link.
- Index: Enter the index of the data to be written. You can select an existing index in Cloud Search Service or manually enter an index name that does not exist. The name can contain only lowercase letters. CDM automatically creates the index in Cloud Search Service. If multiple indexes are migrated at a time, this parameter cannot be configured. CDM automatically creates indexes at the migration destination.
- Clear Data Before Import: If the selected index already exists in Cloud Search Service, you can choose whether to clear the data in the index before importing data. If you select No, the data is added to the index.
- Click Save and Run. The Job Management page is displayed, on which you can view the job execution progress and result.
A sub-job will be generated for each type in the on-premises Elasticsearch index for concurrent execution. You can click the job name to view the sub-job progress.
- After the job is successfully executed, in the Operation column of the job, click Historical Record to view the job's historical execution records, read/write statistics, and job logs (only the sub-jobs have job logs).
Figure 5 Historical Record
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