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Does mapreduce programming model provide a way for reducers to communicate with each other? In a mapreduce job can a reducer communicate with another reducer?
676How would you tackle calculating the number of unique visitors for each hour by mining a huge apache log? You can use post processing on the output of the mapreduce job.
824If reducers do not start before all mappers finish then why does the progress on mapreduce job shows something like map(50%) reduce(10%)? Why reducers progress percentage is displayed when mapper is not finished yet?
711
what are the most common input formats defined in Hadoop?
how to proceed to write your first mapreducer program?
what is distributed cache in mapreduce framework?
What is partitioner and its usage?
Explain JobConf in MapReduce.
How does Hadoop Classpath plays a vital role in stopping or starting in Hadoop daemons?
What is the default value of map and reduce max attempts?
What is shuffling in mapreduce?
How do you stop a running job gracefully?
If reducers do not start before all mappers finish then why does the progress on mapreduce job shows something like map(50%) reduce(10%)? Why reducers progress percentage is displayed when mapper is not finished yet?
What are the primary phases of a Reducer?
Is it necessary to write a mapreduce job in java?
How to set the number of reducers?
What is the need of MapReduce?
Mention what are the main configuration parameters that user need to specify to run mapreduce job?
