# Prerequisites

Before you begin to work with CDP Private Cloud as a target in Qlik Replicate, make sure that the following prerequisites have been met:

* General:

  * The HDFS storage must be accessible from the Qlik Replicate machine.
  * When ODBC Access is selected, the Hive Server must be accessible from the Qlik Replicate machine.

* ODBC Access:

  Accessing Hive using ODBC requires the following to be installed on the Replicate Server machine:

  * Windows: Install Cloudera ODBC driver for Apache Hive 2.6.9 or later.

  * Linux: Install Cloudera ODBC driver for Apache Hive 2.6.9 or later.

    After the driver is installed, edit the odbcinst.ini file as follows:

    `DriverManagerEncoding=UTF-16` `ODBCInstLib=libodbcinst.so`

* [](https://help.qlik.com/en-US/replicate/Content/Replicate/Main/CDP_Data_Center/cdp_prereq_hadoop_gen_target.htm)SSL:

  Before you can use SSL, you first need to perform the following tasks:

  * Configure each NameNode and each DataNode with an SSL certificate (issued by the same CA).
  * Place the CA certificate on the Replicate Server machine. The certificate should be a base64-encoded PEM (OpenSSL) file.

* Permissions:

  The user specified in the CDP Private Cloud target settings must have write permission for the specified HDFS target directory.

* Task Settings:

  Before starting a task with the Full Load and/or Apply Changes replication options enabled, set the Change Processing Mode to Transactional apply as Batch optimized apply is not supported.