Prerequisites

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

General:
- The Hadoop WebHDFS must be accessible from the Qlik Replicate machine.
- The Hadoop Data Nodes must be accessible from the Qlik Replicate machine.
- The Hadoop WebHDFS service must be running.
ODBC Access:

When accessing Hive using ODBC, the following ODBC drivers are supported:
- Hortonworks: Cloudera ODBC Driver for Apache Hive 2.06.09.1009 only.
- Cloudera: Cloudera ODBC Driver for Apache Hive 2.06.09.1009 only.
  
  Information note
  Cloudera ODBC drivers 2.5.20 or later do not support the Snappy compression method.
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 Hadoop target settings must have write permission for the specified HDFS target directory.

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