Link to HDFS

Description

By creating an HDFS link, you can extract files from or load files to MRS, FusionInsight HD, or Apache Hadoop. Files in CSV, Parquet, and binary formats are supported.

Sample Link

{
    "links": [
        {
            "link-config-values": {
                "configs": [
                    {
                        "inputs": [
                            {
                                "name": "linkConfig.hadoopType",
                                "value": "FusionInsight HD"
                            },
                            {
                                "name": "linkConfig.host",
                                "value": "10.120.205.143"
                            },
                            {
                                "name": "linkConfig.casPort",
                                "value": "20009"
                            },
                            {
                                "name": "linkConfig.port",
                                "value": "28443"
                            },
                            {
                                "name": "linkConfig.authType",
                                "value": "KERBEROS"
                            },
                            {
                                "name": "linkConfig.user",
                                "value": "admin"
                            },
                            {
                                "name": "linkConfig.password",
                                "value": "Add password here"
                            },
                            {
                                "name": "linkConfig.runMode",
                                "value": "STANDALONE"
                            }
                        ],
                        "name": "linkConfig"
                    }
                ]
            },
            "name": "hdfslink",
            "connector-name": "hdfs-connector"
        }
    ]
}

Link Parameters

Parameter	Mandatory	Type	Description
linkConfig.hadoopType	Yes	Enumeration	Hadoop type. The options are as follows: MRS: link to HDFS of MRS FusionInsight HD: link to HDFS of FusionInsight HD Apache Hadoop: link to HDFS of Apache Hadoop
linkConfig.uri	No	String	NameNode URI required for the link to Apache Hadoop. The format is ip:port.
linkConfig.host	No	String	IP address of Manager required for the link to MRS or FusionInsight HD
linkConfig.port	No	String	Port number of Manager required for the link to FusionInsight HD
linkConfig.casPort	No	String	Port number of CAS Server that connects to FusionInsight HD required for the link to FusionInsight HD
linkConfig.user	No	String	Username for logging in to Manager. This parameter is not required if the cluster configuration is used.
linkConfig.password	No	String	Password for logging in to Manager. This parameter is not required if the cluster configuration is used.
linkConfig.authType	No	Enumeration	Authentication method. The options are as follows: Simple: for non-security mode Kerberos: for security mode
linkConfig.principal	No	String	Account principal required for Kerveros authentication. You can contact the administrator to obtain the account. Before using the cluster configuration, you must set this parameter in cluster configuration management.
linkConfig.keytab	No	FileContent	Local absolute path of the keytab file required for Kerveros authentication. You can also contact the administrator to obtain the file. Before using the cluster configuration, you must set this parameter in cluster configuration management.
linkConfig.runMode	No	Enumeration	Running mode of the HDFS link. The options are as follows: 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 methods, STANDALONE prevails. If STANDALONE is selected, CDM can migrate data between HDFSs of multiple MRS clusters. Agent: The link instance runs on an agent. If Agent is not used, and the CDM cluster connects to two or more clusters with Kerberos authentication enabled and the same realm, only one cluster can be connected in EMBEDDED mode, and the other clusters must be in STANDALONE mode.
linkConfig.properties	No	Map	Properties. You can add configuration properties of the client. Each property must contain a name and a value.