Cassandra major compaction for leveled compaction column family

Question

What happens when I perform a Major compaction on a column family with the Leveled compaction configured with nodetool compact ?

Documentation says:

compact [keyspace][cf_name]

For column families that use the SizeTieredCompactionStrategy, initiates an immediate major compaction of all column families in keyspace. For each column family in keyspace, this compacts all existing SSTables into a single SSTable. This can cause considerable disk I/O and can temporarily cause up to twice as much disk space to be used. Optionally takes a list of column family names.

This one is related to Tiered compaction. What about Leveled?

akawaguc · Answer 1 · 2015-11-25T13:37:47.193

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Major compaction for LCS has been introduced since Cassandra 2.2 with the following JIRA ticket: https://issues.apache.org/jira/browse/CASSANDRA-7272

But I have never tested it and the manual of nodetool compact from DataStax doesn't describe LCS as of now so I'm not sure if it is actually useful or not.

edited Nov 25 '15 at 13:37

answered Nov 25 '15 at 10:14

akawaguc

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Related Q&A: https://stackoverflow.com/questions/56422062/major-compaction-on-lcs – akawaguc Sep 27 '19 at 07:54

score 3 · Accepted Answer · answered Apr 29 '13 at 15:18

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There is no such thing as a major compaction for LCS. nodetool compact will invoke the next minor compaction and is thus only useful if you've disabled automatic compaction for increased manual control.

answered Apr 29 '13 at 15:18

jbellis

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Might be worth updating the post since Cassandra has major compaction for LCS since 2.2.x (or something close to that). :) – Pedro Gordo Apr 14 '19 at 19:40

Cassandra major compaction for leveled compaction column family

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