EMERGING TRENDS IN SOFTWARE ENGINEERING
CLOUD COMPUTING
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of the following components reside on a NameNode?
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Filenames, blocks and checksums
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Blocks and heartbeat messages
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Filenames, block locations
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Blocks and block locations
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Explanation:
Detailed explanation-1: -HDFS Namenode stores meta-data i.e. number of data blocks, file name, path, Block IDs, Block location, no. of replicas, and also Slave related configuration. This meta-data is available in memory in the master for faster retrieval of data.
Detailed explanation-2: -FsImage: It contains the complete state of the file system namespace since the start of the NameNode.
Detailed explanation-3: -Hadoop HDFS-Hadoop Distributed File System (HDFS) is the storage unit. Hadoop MapReduce-Hadoop MapReduce is the processing unit. Hadoop YARN-Yet Another Resource Negotiator (YARN) is a resource management unit. 30-Jan-2023
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