Link to Hive_DataArts Studio

MRS Hive

You can view a table during field mapping only when you have the permission to access the table connected to MRS Hive.

MRS Hive links apply to the MapReduce Service (MRS) on . Table 1 describes related parameters.

Before creating an MRS link, you need to add an authenticated Kerberos user on MRS and log in to the MRS management page to change the initial password. Then use the new user to create an MRS link.
To connect to an MRS 2.x cluster, create a CDM cluster of version 2.x first. CDM 1.8.x clusters cannot connect to MRS 2.x clusters.
Currently, the Hive link obtains the core-site.xml configuration information from MRS HDFS. Therefore, if MRS Hive uses OBS as the underlying storage system, configure the AK/SK of OBS on MRS HDFS before creating the Hive link.
Ensure that the MRS cluster and the DataArts Studio instance can communicate with each other. The following requirements must be met for network interconnection:
- If the CDM cluster in the DataArts Studio instance and the MRS cluster are in different regions, a public network or a dedicated connection is required. If the Internet is used for communication, ensure that an EIP has been bound to the CDM cluster, and the MRS cluster can access the Internet and the port has been enabled in the firewall rule.
- If the CDM cluster in the DataArts Studio instance and the MRS cluster are in the same region, VPC, subnet, and security group, they can communicate with each other by default. If they are in the same VPC but in different subnets or security groups, you must configure routing rules and security group rules. For details about how to configure security group rules, see configuring security group rules.
- The MRS cluster and the DataArts Studio workspace belong to the same enterprise project. If they do not, you can modify the enterprise project of the workspace.

**Table 1** MRS Hive link parameters
Parameter	Description	Example Value
Name	Link name, which should be defined based on the data source type, so it is easier to remember what the link is for	hivelink
Manager IP	Floating IP address of MRS Manager. Click Select next to the Manager IP text box to select an MRS cluster. CDM automatically fills in the authentication information.	127.0.0.1
Authentication Method	Authentication method used for accessing MRS SIMPLE: Select this for non-security mode. KERBEROS: Select this for security mode.	SIMPLE
HIVE Version	Set this to the Hive version on the server.	HIVE_3_X
Username	If Authentication Method is set to KERBEROS, you must provide the username and password used for logging in to MRS Manager. If you need to create a snapshot when exporting a directory from HDFS, the user configured here must have the administrator permission on HDFS. To create a data connection for an MRS security cluster, do not use user admin. The admin user is the default management page user and cannot be used as the authentication user of the security cluster. You can create an MRS user and set Username and Password to the username and password of the created MRS user when creating an MRS data connection. NOTE: If the CDM cluster version is 2.9.0 or later and the MRS cluster version is 3.1.0 or later, the created user must have the permissions of the Manager_viewer role to create links on CDM. To perform operations on databases, tables, and columns of an MRS component, you also need to add the database, table, and column permissions of the MRS component to the user by following the instructions in the MRS documentation. If the CDM cluster version is earlier than 2.9.0 or the MRS cluster version is earlier than 3.1.0, the created user must have the permissions of Manager_administrator or System_administrator to create links on CDM. A user with only the Manager_tenant or Manager_auditor permission cannot create connections.	cdm
Password	Password used for logging in to MRS Manager	-
OBS storage support	The server must support OBS storage. When creating a Hive table, you can store the table in OBS.	No
Run Mode	This parameter is used only when the Hive version is HIVE_3_X. Possible values are: EMBEDDED: The link instance runs with CDM. This mode delivers better performance. Standalone: The link instance runs in an independent process. If CDM needs to connect to multiple Hadoop data sources (MRS, Hadoop, or CloudTable) with both Kerberos and Simple authentication modes, select STANDALONE or configure different agents. Note: The STANDALONE mode is used to solve the version conflict problem. If the connector versions of the source and destination ends of the same link are different, a JAR file conflict occurs. In this case, you need to place the source or destination end in the STANDALONE process to prevent the migration failure caused by the conflict.	EMBEDDED
Check Hive JDBC Connectivity	Whether to check the Hive JDBC connectivity	No
Use Cluster Config	You can use the cluster configuration to simplify parameter settings for the Hadoop connection.	No
Cluster Config Name	This parameter is valid only when Use Cluster Config is set to Yes. Select a cluster configuration that has been created. For details, see Managing Cluster Configurations.	hive_01

Click Show Advanced Attributes, and then click Add to add configuration attributes of other clients. The name and value of each attribute must be configured. You can click Delete to delete no longer used attributes.

The following are some examples:

connectTimeout=360000 and socketTimeout=360000: When a large amount of data needs to be migrated or the entire table is retrieved using query statements, the migration fails due to connection timeout. In this case, you can customize the connection timeout interval (ms) and socket timeout interval (ms) to prevent failures caused by timeout.
hive.server2.idle.operation.timeout=360000: To prevent Hive migration jobs from being suspended for a long time, you can customize the operation timeout period (ms).
hive.storeFormat=textfile: During data migration from a relational database to Hive, tables in ORC format are automatically created by default. If you want textfile or parquet tables to be created, add hive.storeFormat=textfile or hive.storeFormat=parquet.
fs.defaultFS=obs://hivedb: If the interconnected MRS Hive uses decoupled storage and compute, you can use this configuration to achieve better compatibility.

FusionInsight Hive

The FusionInsight Hive link is applicable to data migration of FusionInsight HD in the local data center. You must use Direct Connect to connect to FusionInsight HD.

Table 2 describes related parameters.

**Table 2** FusionInsight Hive link parameters
Parameter	Description	Example Value
Name	Link name, which should be defined based on the data source type, so it is easier to remember what the link is for	hivelink
Manager IP	IP address of FusionInsight Manager	127.0.0.1
Manager Port	Port number of FusionInsight Manager	28443
CAS Server Port	Port number of the CAS server used to connect to FusionInsight	20009
Authentication Method	Authentication method used for accessing the cluster: SIMPLE: Select this for non-security mode. KERBEROS: Select this for security mode.	SIMPLE
HIVE Version	Hive version	HIVE_3_X
Username	Username used for logging in to FusionInsight Manager.	cdm
Password	Password used for logging in to FusionInsight Manager	-
OBS storage support	The server must support OBS storage. When creating a Hive table, you can store the table in OBS.	No
Run Mode	This parameter is used only when the Hive version is HIVE_3_X. Possible values are: EMBEDDED: The link instance runs with CDM. This mode delivers better performance. Standalone: The link instance runs in an independent process. If CDM needs to connect to multiple Hadoop data sources (MRS, Hadoop, or CloudTable) with both Kerberos and Simple authentication modes, select STANDALONE or configure different agents. Note: The STANDALONE mode is used to solve the version conflict problem. If the connector versions of the source and destination ends of the same link are different, a JAR file conflict occurs. In this case, you need to place the source or destination end in the STANDALONE process to prevent the migration failure caused by the conflict.	EMBEDDED
Use Cluster Config	You can use the cluster configuration to simplify parameter settings for the Hadoop connection.	No
Cluster Config Name	This parameter is valid only when Use Cluster Config is set to Yes. Select a cluster configuration that has been created. For details, see Managing Cluster Configurations.	hive_01

Click Show Advanced Attributes, and then click Add to add configuration attributes of other clients. The name and value of each attribute must be configured. You can click Delete to delete no longer used attributes.

The following are some examples:

connectTimeout=360000 and socketTimeout=360000: When a large amount of data needs to be migrated or the entire table is retrieved using query statements, the migration fails due to connection timeout. In this case, you can customize the connection timeout interval (ms) and socket timeout interval (ms) to prevent failures caused by timeout.
hive.server2.idle.operation.timeout=360000: To prevent Hive migration jobs from being suspended for a long time, you can customize the operation timeout period (ms).
hive.storeFormat=textfile: During data migration from a relational database to Hive, tables in ORC format are automatically created by default. If you want textfile or parquet tables to be created, add hive.storeFormat=textfile or hive.storeFormat=parquet.

Apache Hive

The Apache Hive link is applicable to data migration of the third-party Hadoop in the local data center or ECS. You must use Direct Connect to connect to Hadoop in the local data center.

Table 3 describes related parameters.

**Table 3** Apache Hive link parameters
Parameter	Description	Example Value
Name	Link name, which should be defined based on the data source type, so it is easier to remember what the link is for	hivelink
URI	NameNode URI	hdfs://hacluster
Hive Metastore	Hive metadata address. For details, see the hive.metastore.uris configuration item. Example: thrift://host-192-168-1-212:9083	-
Authentication Method	Authentication method used for accessing the cluster: SIMPLE: Select this for non-security mode. KERBEROS: Select this for security mode.	SIMPLE
HIVE Version	Hive version	HIVE_3_X
IP and Host Name Mapping	If the Hadoop configuration file uses the host name, configure the mapping between the IP address and host name. Separate the IP addresses and host names by spaces and mappings by semicolons (;), carriage returns, or line feeds.	-
OBS storage support	The server must support OBS storage. When creating a Hive table, you can store the table in OBS.	No
Principal	When Authentication Method is set to KERBEROS, this parameter is mandatory. It is the username in the Kerberos security mode and can be obtained from the Hadoop administrator. The value of this parameter must be the same as that in the Keytab file.	-
Keytab File	When Authentication Method is set to KERBEROS, a Keytab file must be uploaded. The Keytab file is an authentication credential and can be obtained from the Hadoop administrator. Before obtaining the keytab file, you need to change the password of this user at least once in the cluster. Otherwise, the downloaded keytab file may be unavailable. After a user password is changed, the exported keytab file becomes invalid, and you need to export a keytab file again.	-
Run Mode	This parameter is used only when the Hive version is HIVE_3_X. Possible values are: EMBEDDED: The link instance runs with CDM. This mode delivers better performance. Standalone: The link instance runs in an independent process. If CDM needs to connect to multiple Hadoop data sources (MRS, Hadoop, or CloudTable) with both Kerberos and Simple authentication modes, select STANDALONE or configure different agents. Note: The STANDALONE mode is used to solve the version conflict problem. If the connector versions of the source and destination ends of the same link are different, a JAR file conflict occurs. In this case, you need to place the source or destination end in the STANDALONE process to prevent the migration failure caused by the conflict.	EMBEDDED
Use Cluster Config	You can use the cluster configuration to simplify parameter settings for the Hadoop connection.	No
Cluster Config Name	This parameter is valid only when Use Cluster Config is set to Yes. Select a cluster configuration that has been created. For details, see Managing Cluster Configurations.	hive_01
Hive JDBC URL	URL for connecting to Hive JDBC. By default, anonymous users are used.	-

Click Show Advanced Attributes, and then click Add to add configuration attributes of other clients. The name and value of each attribute must be configured. You can click Delete to delete no longer used attributes.

The following are some examples:

connectTimeout=360000 and socketTimeout=360000: When a large amount of data needs to be migrated or the entire table is retrieved using query statements, the migration fails due to connection timeout. In this case, you can customize the connection timeout interval (ms) and socket timeout interval (ms) to prevent failures caused by timeout.
hive.server2.idle.operation.timeout=360000: To prevent Hive migration jobs from being suspended for a long time, you can customize the operation timeout period (ms).
hive.storeFormat=textfile: During data migration from a relational database to Hive, tables in ORC format are automatically created by default. If you want textfile or parquet tables to be created, add hive.storeFormat=textfile or hive.storeFormat=parquet.

Link to Hive

MRS Hive

FusionInsight Hive

Apache Hive

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