@Prakhar Agrawal Take a look at the DistributedMapCache. It allows you to save flowfile data for consumption by processors across nodes and processors. There are two controller components, the DistributesMapCacheServer (runs on one node) and the DistricutedMapCacheClient (runs on all nodes if you've got a cluster). There are also the processors that interact with the DistributedMapCache, namely FetchDistributedMapCache and PutDistributedMapCache Take a look here for some elaboration/documentation: https://nifi.apache.org/docs.html https://community.hortonworks.com/questions/35223/distributedmapcacheclientservice-nifi-wecrawlerxml.html Here for examples using DistributedMapCache: https://github.com/hortonworks-gallery/nifi-templates/tree/master/templates (webcrawler.xml template) http://funnifi.blogspot.ca/2016/04/ ... View more

@Phaneendra S Like debugging, this is a broad topic that is more an art than a science. To get you started, below are some links that provide insights on what you can look for. This one is a presentation showcasing the "new" version of Explain and walks through a debugging example: https://www.slideshare.net/HadoopSummit/how-to-understand-and-analyze-apache-hive-query-execution-plan-for-performance-debugging This one explains how Hive Joins would appear in Explains: http://www.openkb.info/2014/11/understanding-hive-joins-in-explain.html As always, if you find this post helpful, don't forget to "accept" answer. ... View more

@Pulak Nath - The questions will not change, as that is a sample exam intended for practice purposes. I will recommend to go through all the topics before appearing for the exam. Hope this clarifies! ... View more