Answer / Anwar Ahmad Khan

In older versions of Hadoop, the JobTracker and TaskTrackers were indeed on separate machines. However, in newer versions (Hadoop 2 and above), these components have been replaced by ResourceManager and NodeManager/DataNode, respectively, as part of Apache YARN (Yet Another Resource Negotiator). These components can run on the same machine or different machines depending on the cluster configuration.

How to create the directory when name node is in safe mode?

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Can hadoop replace relational database?

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If we want to copy 10 blocks from one machine to another, but another machine can copy only 8.5 blocks, can the blocks be broken at the time of replication?

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Explain how is data partitioned before it is sent to the reducer if no custom partitioner is defined in hadoop?

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what is next step after mapper or maptask?

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If DataNode increases, then do we need to upgrade NameNode?

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What is structured and unstructured data?

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Which are the three modes in which hadoop can be run?

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What is distributed copy (distcp)?

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Give me the examples of Columnar database ?

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How can we create a hadoop cluster from scratch?

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Define a udf?

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