Jeff Ferland created CASSANDRA-10979:
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Summary: LCS doesn't do L0 STC on new tables while an L0->L1
compaction is in progress
Key: CASSANDRA-10979
URL: https://issues.apache.org/jira/browse/CASSANDRA-10979
Project: Cassandra
Issue Type: Bug
Components: Compaction
Environment: 2.1.11 / 4.8.3 DSE.
Reporter: Jeff Ferland
Reading code from
https://github.com/apache/cassandra/blob/cassandra-2.1/src/java/org/apache/cassandra/db/compaction/LeveledManifest.java
and comparing with behavior shown in
https://gist.github.com/autocracy/c95aca6b00e42215daaf, the following happens:
Score for L1,L2,and L3 is all < 1 (paste shows 20/10 and 200/100, due to
incremental repair).
Relevant code from here is
if (Sets.intersection(l1overlapping, compacting).size() > 0)
return Collections.emptyList();
Since there will be overlap between what is compacting and L1 (in my case,
pushing over 1,000 tables in to L1 from L0 SCTS), I get a pile up of 1,000
smaller tables in L0 while awaiting the transition from L0 to L1 and destroy my
performance.
Requested outcome is to continue to perform SCTS on non-compacting L0 tables.
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