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For the server to start with support for notifications, the following must be in the classpath:

.....     (a) activemq jar

.....     (b) jndi.properties file with properties suitably configured for notifications

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1. The HCatalog server start script is $YOUR_HCAT_SERVER/share/hcatalog/scripts/hcat_server_start.sh.
2. This script expects classpath to be set by the AUX_CLASSPATH environment variable.
3. Therefore set AUX_CLASSPATH to satisfy (a) and (b) above.
4. The jndi.properties file is located at $YOUR_HCAT_SERVER/etc/hcatalog/jndi.properties.
5. You need to uncomment and set the following properties in the jndi.properties file:
   • java.naming.factory.initial = org.apache.activemq.jndi.ActiveMQInitialContextFactory
   • java.naming.provider.url = tcp://localhost:61616 ..    (This is the ActiveMQ URL in your setup.)

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If tables are created while the server is configured for notifications, a default topic name is automatically set as a table property. To use notifications with tables created previously (either in other HCatalog installations or prior to enabling notifications in the current installation) you will have to manually set a topic name. For example:

.....     $YOUR_HCAT_CLIENT_HOME/bin/hcat -e "ALTER TABLE access SET hcat.msgbus.topic.name=$TOPIC_NAME"

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