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Jeff Ferland commented on CASSANDRA-10979: ------------------------------------------ [~sebastian.este...@datastax.com]: Can you cut a build of DSE 4.8.4 with this patch added? I'll try my best to test within a week. > 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 > Assignee: Carl Yeksigian > Labels: compaction, leveled > Fix For: 3.x > > Attachments: 10979-2.1.txt > > > 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. -- This message was sent by Atlassian JIRA (v6.3.4#6332)