Have you ever used Counters in Hadoop. Give us an example scenario?
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How indexing is done in HDFS?
How Mapper is instantiated in a running job?
What is Hadoop streaming?
What is HDFS Block size? How is it different from traditional file system block size?
How to exit the vi editor?
Explain use cases where SequenceFile class can be a good fit?
What stored in HDFS?
Should we use RAID in Hadoop or not?
How to keep HDFS cluster balanced?
How client application interacts with the NameNode?
What is the purpose of DataNode block scanner?
Explain InputFormat?
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