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From "Jeff Ferland (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-10979) LCS doesn't do L0 STC on new tables while an L0->L1 compaction is in progress
Date Thu, 07 Jan 2016 00:30:39 GMT
Jeff Ferland created CASSANDRA-10979:
----------------------------------------

             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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