in flume-shared/flume-shared-kafka/src/main/java/org/apache/flume/shared/kafka/KafkaSSLUtil.java [59:64]
private static void addGlobalSSLParameter(Properties kafkaProps,
String propName, String globalValue) {
if (!kafkaProps.containsKey(propName) && globalValue != null) {
kafkaProps.put(propName, globalValue);
}
}