June 2019
Beginner to intermediate
360 pages
10h 55m
English
Content preview from Big Data Simplified
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106 | Big Data Simplied
are automatically partitioned and replicated throughout the cluster. Using a process called com-
paction, Cassandra periodically consolidates SSTables, discarding obsolete data and tombstone
(an indicator that data was deleted).
5.4.3 Components of Cassandra
The key components of Cassandra are listed as follows.
• Node: It is the place where data is stored.
• Data centre: It is a collection of related nodes.
• Cluster: A cluster is a component that contains one or more data centres.
• Commit log: The commit log is a crash-recovery mechanism in Cassandra. Every write oper-
ation is written to the commit log.
• Memtable: A memtable is a memory-resident data structure. After commit log, the data will
be written ...
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