Scenario

This section describes how to add a Hive data source on HSConsole.

Currently, HetuEngine supports data sources of the following traditional data formats: AVRO, TEXT, RCTEXT, Binary, ORC, Parquet, and SequenceFile.

Prerequisites

The domain name of the cluster where the data source is located must be different from the HetuEngine cluster domain name.
The cluster where the data source is located and the HetuEngine cluster nodes can communicate with each other.
A HetuEngine compute instance has been created.

Procedure

Obtain the hdfs-site.xml and core-site.xml configuration files of the Hive data source cluster.
1. Log in to FusionInsight Manager of the cluster where the Hive data source is located.
2. Choose Cluster > Dashboard.
3. Choose More > Download Client and download the client file to the local computer.
4. Decompress the downloaded client file package and obtain the core-site.xml and hdfs-site.xml files in the FusionInsight_Cluster_1_Services_ClientConfig/HDFS/config directory.
5. Check whether the core-site.xml file contains the fs.trash.interval configuration item. If not, add the following configuration items:
```
<property>
<name>fs.trash.interval</name>
<value>2880</value>
</property>
```
6. Change the value of dfs.client.failover.proxy.provider.hacluster in the hdfs-site.xml file to org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider.
```
<property>
<name>dfs.client.failover.proxy.provider.hacluster</name>
<value>org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider</value>
</property>
```
  - If HDFS has multiple NameServices, change the values of dfs.client.failover.proxy.provider.NameService name for multiple NameServices in the hdfs-site.xml file to org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider.
  - In addition, if the hdfs-site.xml file references the host name of a non-HetuEngine cluster node, you need to add the mapping between the referenced host name and the corresponding IP address to the /etc/hosts file of each HetuEngine cluster node. Otherwise, HetuEngine cannot connect to the node that is not in this cluster based on the host name.
  If the Hive data source to be interconnected is in the same Hadoop cluster with HetuEngine, you can log in to the HDFS client and run the following commands to obtain the hdfs-site.xml and core-site.xml configuration files. For details, see Using the HDFS Client.
  
  hdfs dfs -get /user/hetuserver/fiber/restcatalog/hive/core-site.xml
  
  hdfs dfs -get /user/hetuserver/fiber/restcatalog/hive/hdfs-site.xml
Obtain the user.keytab and krb5.conf files of the proxy user of the Hive data source.
1. Log in to FusionInsight Manager of the cluster where the Hive data source is located.
2. Choose System > Permission > User.
3. Locate the row that contains the target data source user, click More in the Operation column, and select Download Authentication Credential.
4. Decompress the downloaded package to obtain the user.keytab and krb5.conf files.
  
  The proxy user of the Hive data source must be associated with at least the hive user group.
Obtain the MetaStore URL and the Principal of the server.
1. Decompress the client package of the cluster where the Hive data source is located and obtain the hive-site.xml file from the FusionInsight_Cluster_1_Services_ClientConfig/Hive/config directory.
2. Open the hive-site.xml file and search for hive.metastore.uris. The value of hive.metastore.uris is the value of MetaStore URL. Search for hive.server2.authentication.kerberos.principal. The value of hive.server2.authentication.kerberos.principal is the value of Principal on the server.
Log in to FusionInsight Manager as a HetuEngine administrator and choose Cluster > Services > HetuEngine. The HetuEngine service page is displayed.
In the Basic Information area on the Dashboard page, click the link next to HSConsole WebUI. The HSConsole page is displayed.

Choose Data Source and click Add Data Source. Configure parameters on the Add Data Source page.

Configure parameters in the Basic Information area. For details, see Table 1.

**Table 1** Basic Information
Parameter	Description	Example Value
Name	Name of the data source to be connected. The value can contain only letters, digits, and underscores (_) and must start with a letter.	hive_1
Data Source Type	Type of the data source to be connected. Select Hive.	Hive
Mode	Mode of the current cluster. The default value is Security Mode.	-
Description	Description of the data source. The value can contain only letters, digits, commas (,), periods (.), underscores (_), spaces, and line breaks.	-

Configure parameters in the Hive Configuration area. For details, see Table 2.

**Table 2** Hive Configuration
Parameter	Description	Example Value
Driver	The default value is fi-hive-hadoop.	fi-hive-hadoop
hdfs-site File	Select the hdfs-site.xml configuration file obtained in 1. The file name is fixed.	-
core-site File	Select the core-site.xml configuration file obtained in 1. The file name is fixed.	-
krb5 File	Configure this parameter when the security mode is enabled. It is the configuration file used for Kerberos authentication. Select the krb5.conf file obtained in 2.	krb5.conf
Enable Data Source Authentication	Whether to use the permission policy of the Hive data source for authentication. If Ranger is disabled for the HetuEngine service, select Yes. If Ranger is enabled, select No.	No

Configure parameters in the MetaStore Configuration area. For details, see Table 3.

**Table 3** MetaStore Configuration
Parameter	Description	Example Value
Metastore URL	URL of the MetaStore of the data source. For details, see 3.	thrift://10.92.8.42:21088,thrift://10.92.8.43:21088,thrift://10.92.8.44:21088
Security Authentication Mechanism	After the security mode is enabled, the default value is KERBEROS.	KERBEROS
Server Principal	Configure this parameter when the security mode is enabled. It specifies the username with domain name used by meta to access MetaStore. For details, see 3.	hive/hadoop.hadoop.com@HADOOP.COM
Client Principal	Configure this parameter when the security mode is enabled. The parameter format is as follows: Username for accessing MetaStore@domain name (uppercase).COM. Username for accessing MetaStore is the user to which the user.keytab file obtained in 2 belongs.	admintest@HADOOP.COM
Keytab File	Configure this parameter when the security mode is enabled. It specifies the keytab credential file of the MetaStore user name. The file name is fixed. Select the user.keytab file obtained in 2.	user.keytab

Configure parameters in the Connection Pool Configuration area. For details, see Table 4.

**Table 4** Connection Pool Configuration
Parameter	Description	Example Value
Enable Connection Pool	Whether to enable the connection pool when accessing Hive MetaStore.	Yes/No
Maximum Connections	Maximum number of connections in the connection pool when accessing Hive MetaStore.	50

Configure parameters in Hive User Information Configuration. For details, see Table 5.

Hive User Information Configuration and HetuEngine-Hive User Mapping Configuration must be used together. When HetuEngine is connected to the Hive data source, user mapping enables HetuEngine users to have the same permissions of the mapped Hive data source user. Multiple HetuEngine users can correspond to one Hive user.

**Table 5** Hive User Information Configuration
Parameter	Description	Example Value
Data Source User	Data source user information. The value can contain only letters, digits, underscores (_), hyphens (-), and periods (.), and must start with a letter or underscore (_). The minimum length is 2 characters and the maximum length is 100 characters.	If the data source user is set to hiveuser1, a HetuEngine user mapped to hiveuser1 must exist. For example, create hetuuser1 and map it to hiveuser1.
Keytab File	Obtain the authentication credential of the user corresponding to the data source.	hiveuser1.keytab

Configure parameters in the HetuEngine-Hive User Mapping Configuration area. For details, see Table 6.

**Table 6** HetuEngine-Hive User Mapping Configuration
Parameter	Description	Example Value
HetuEngine User	HetuEngine user information. The value can contain only letters, digits, underscores (_), hyphens (-), and periods (.), and must start with a letter or underscore (_). The minimum length is 2 characters and the maximum length is 100 characters.	hetuuser1
Data Source User	Data source user information. The value can contain only letters, digits, underscores (_), hyphens (-), and periods (.), and must start with a letter or underscore (_). The minimum length is 2 characters and the maximum length is 100 characters.	hiveuser1 (data source user configured in Table 5)

Modify custom configurations.

You can click Add to add custom configuration parameters by referring to Table 7.

**Table 7** Custom parameters
Parameter	Description	Example Value
hive.metastore.connection.pool.maxTotal	Maximum number of connections in the connection pool.	50 (Value range: 0-200)
hive.metastore.connection.pool.maxIdle	Maximum number of idle threads in the connection pool. When the number of idle threads reaches the maximum number, new threads are not released. Default value: 10.	10 (The value ranges from 0 to 200 and cannot exceed the maximum number of connections.)
hive.metastore.connection.pool.minIdle	Minimum number of idle threads in the connection pool. When the number of idle threads reaches the minimum number, the thread pool does not create new threads. Default value: 10.	10 (The value ranges from 0 to 200 and cannot exceed the value of hive.metastore.connection.pool.maxIdle.)

You can click Delete to delete custom configuration parameters.
- You can add prefixes coordinator. and worker. to the preceding custom configuration items to configure coordinators and workers, respectively. For example, if worker.hive.metastore.connection.pool.maxTotal is set to 50, a maximum number of 50 connections are allowed for workers to access Hive MetaStore. If no prefix is added, the configuration item is valid for both coordinators and workers.
- By default, the maximum number of connections for coordinators to access Hive MetaStore is 5 and the maximum and minimum numbers of idle data source connections are both 10. The maximum number of connections for workers to access Hive MetaStore is 20, the maximum and minimum numbers of idle data source connections are both 0.

Click OK.

Log in to the node where the cluster client is located and run the following commands to switch to the client installation directory and authenticate the user:
cd /opt/client

source bigdata_env

kinit User performing HetuEngine operations (If the cluster is in normal mode, skip this step.)
Run the following command to log in to the catalog of the data source:
hetu-cli --catalog Data source name --schema default

For example, run the following command:

hetu-cli --catalog hive_1 --schema default

Run the following command to view the database table:

show tables;

  Table  
---------
 hivetb   
(1 rows)

Query 20210730_084524_00023_u3sri@default@HetuEngine, FINISHED, 3 nodes
Splits: 36 total, 36 done (100.00%)
0:00 [2 rows, 47B] [7 rows/s, 167B/s]

Configuring a Traditional Data Source

Scenario

Prerequisites

Procedure