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Big Data Simplified
book

Big Data Simplified

by Sayan Goswami, Amit Kumar Das, Sourabh Mukherjee
June 2019
Beginner to intermediate content levelBeginner to intermediate
360 pages
10h 55m
English
Pearson Education India
Content preview from Big Data Simplified
Introducing Hadoop | 59
3.4.4 NameNode Failure Management
Now that you have an understanding of how replication handles failures in DataNodes, let us
take a look at failure management for the NameNode. As you now realize, the NameNode is the
most important node in the cluster. Without the NameNode, we will have no idea which le is
stored on which DataNode. In the mappings that the NameNode holds within itself, the block
locations are not persistent. These block locations are stored in memory for quick lookup, where
it is called block caching.
If the NameNode fails, then the file block locations in memory will be completely lost.
Therefore, ...
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Publisher Resources

ISBN: 9789353941505