Define “speculative execution” in hadoop?
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When and how to create hadoop archive?
What are the main features and Characteristics of Hadoop which makes it the most popular and powerful Big Data tool?
What happens if one hadoop client renames a file or a directory containing this file while another client is still writing into it?
What does rack awareness mean?
What are some typical functions of job tracker in hadoop?
Ideally what should be the block size in hadoop?
Is it possible to have hadoop job output in multiple directories? If yes, how?
Specify what the information segments utilized by hadoop are?
After the Map phase finishes, the Hadoop framework does 'Partitioning, Shuffle and sort'. Explain what happens in this phase?
Name the files which are used by the startup and shutdown commands?
What are the port numbers of job tracker?
What is High Availability feature in Hadoop2?
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