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Support Article

Unable to fetch host name from DSS for Cassandra connect ruleset



The host file in Connect-Cassandra rules does not accept dynamic values and requires a hardcoded IP address. Each environment uses a different IP address, and the rules requiring hardcoded IP addresses block migration.

Error Messages

Not Applicable

Steps to Reproduce

  1. Include 20 connect Cassandra rules and pass the host names from a Dynamic System Settings (DSS) setting.
  2. Configure a Cassandra connect ruleset to look for IP addresses.
  3. Move the locked rulesets from one environment to another, ensure that the host names from DSS setting cannot be updated.

Root Cause

Rule-connect-Cassandra contains some environment variables that are tight to the rule form. While migrating the rule from different environments, the values may change due to some mismatches between the environments. Using this feature, values can be overridden on the rule form by defining matching DSS. If there are no matching values defined, then values on the rule form are used.


  1. Apply HFix-36294.
  2. For the Rule-connect-Cassandra, define DSS values with predefined prefixes on Pega-BigData Ruleset.
Value Prefix Description
Host connector/cassandra/host/ host or comma separated host names
Port connector/cassandra/port/ port number ,default 9042
Keyspace connector/cassandra/keyspace/ keyspace that will be used.

Rule Form Value DSS @ Pega-BigData Value that will be used
host: cassandracluster - cassandracluster
host: cassandracluster connector/cassandra/host/cassandracluster -> host1,host2 host1,host2
port: - 9042
port: 1234 connector/cassandra/port/1234 -> 9042 9042
keyspace : testkeypace - testkeypace
keyspace : testkeypace connector/cassandra/keyspace/testkeypace -> prodkeyspace prodkeyspace

Published December 11, 2017 - Updated October 8, 2020

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