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Posted to user@cassandra.apache.org by Dan Kinder <dk...@turnitin.com> on 2017/10/05 20:08:51 UTC

LCS major compaction on 3.2+ on JBOD

Hi

I am wondering how major compaction behaves for a table using LCS on JBOD
with Cassandra 3.2+'s JBOD improvements.

Up to then I know that major compaction would use a single thread, include
all SSTables in a single compaction, and spit out a bunch of SSTables in
appropriate levels.

Does 3.2+ do 1 compaction per disk, since they are separate leveled
structures? Or does it do a single compaction task that writes SSTables to
the appropriate disk by key range?

-dan