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What is optimal size of a file for distributed cache?
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It can be possible that a Job has 0 reducers?
What is Combiner in MapReduce?
what is JobTracker in Hadoop? What are the actions followed by Hadoop?
What is an input reader in reference to mapreduce?
What is difference between an input split and hdfs block?
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 is the difference between map and reduce?
Map reduce jobs are failing on a cluster that was just restarted. They worked before restart. What could be wrong?
What is shuffling and sorting in Hadoop MapReduce?
how can you debug Hadoop code?
What is Text Input Format?
What main configuration parameters are specified in mapreduce?
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