July 2017
Intermediate to advanced
796 pages
18h 55m
English
Content preview from Scala and Spark for Big Data Analytics
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HDFS Snapshot
Hadoop 2.0 also added a new capability: taking a snapshot (read-only copy and copy-on-write) of the filesystem (data blocks) stored on the data nodes. Using Snapshots, you can take a copy of directories seamlessly using the NameNode's metadata of the data blocks. Snapshot creation is instantaneous and doesn't require interference with other regular HDFS operations.
The following is an illustration of how snapshot works on specific directories:
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