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Mastering Apache Cassandra 3.x - Third Edition
book

Mastering Apache Cassandra 3.x - Third Edition

by Aaron Ploetz, Tejaswi Malepati
October 2018
Beginner to intermediate content levelBeginner to intermediate
348 pages
10h
English
Packt Publishing
Content preview from Mastering Apache Cassandra 3.x - Third Edition

Compaction

As previously mentioned, once SSTable files are written to disk, they are immutable (cannot be written to again). Additional writes for that table would eventually result in additional SSTable files. As this process continues, it is possible for long-standing rows of data to be spread across multiple files. Reading multiple files to satisfy a query eventually becomes slow, especially when considering how obsolete data and tombstones must be reconciled (so as not to end up in the result set).

Apache Cassandra's answer to this problem is to periodically execute a process called compaction. When compaction runs, it performs the following functions:

  • Multiple data files for a table are merged into a single data file
  • Obsoleted data ...
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Publisher Resources

ISBN: 9781789131499Supplemental Content