EMERGING TRENDS IN COMPUTING
CLOUD COMPUTING
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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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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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: -Hadoop HDFS Data Read Operation. To read a file from HDFS, a client needs to interact with namenode (master) as namenode is the centerpiece of Hadoop cluster (it stores all the metadata i.e. data about the data).
Detailed explanation-3: -NameNode. A NameNode keeps track of all the files or datasets in HDFS. It knows the list of blocks that are made up of files in HDFS, not only the list of blocks but also the location of them.
Detailed explanation-4: -Hadoop HDFS-Hadoop Distributed File System (HDFS) is the storage unit of Hadoop. Hadoop MapReduce-Hadoop MapReduce is the processing unit of Hadoop. Hadoop YARN-Hadoop YARN is a resource management unit of Hadoop. 30-Jan-2023