What is a combiner and where you should use it?
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how JobTracker schedules a task ?
What is MapReduce in Hadoop?
Can we set the number of reducers to zero in MapReduce?
When Namenode is down what happens to job tracker?
What happens when a datanode fails ?
Is it possible to search for files using wildcards?
what is a sequence file in Hadoop?
How does Hadoop Classpath plays a vital role in stopping or starting in Hadoop daemons?
What is Reducer in MapReduce?
What is the difference between HDFS block and input split?
Explain the Reducer's reduce phase?
How to compress mapper output in Hadoop?
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