since cca175 has been updated with new syllabus. Am i required to learn flume and kafka.
Flume and Kafka questions are not asked in test. If you just want to cleat test then focus on Sqoop, Spark and Hive.
Kafka is out of syllabus but Flume and Spark Streaming are in syllabus. Even though no one have reported any questions on those topics, I will highly recommend to go through the content and get some level of comfort on those areas.
When did they change the syllabus? I could not see any change in the pre-requisites in the certification site.