What is the use of combiner?

Combine Mapper output Separate Reducer output Separate Mapper input Separate Mapper output

What is the default namenode server port number?

50070 50020 50010 50040

What is the use of partitioner?

Separate Reducer output Separate Mapper output Separate Mapper input Default mapper

What open-source software was developed from Google’s MapReduce concept?

MongoDB Splunk Hadoop Puppet

Which ecosystem component is used for workflow and scheduling?

Oozie Zookeeper Jobtracker Flume