What does Hadoop’s Heartbeat mean?
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Describe the HDFS Safe mode.
Explain HDFS’s Block and Block Scanner.
Which two messages does NameNode get from DataNode?
What is big data?
What role does Apache Hadoop’s distributed cache play?
What happens when Block Scanner finds a faulty data block?
How does schema evolution work?
What does FIFO entail?
What does SerDe in the Hive mean?