[jira] [Created] (CASSANDRA-15250) Large cartesian produces in IN queries cause the server to run out of memory

["Avi Kivity (JIRA)" <ji...@apache.org>]

Avi Kivity created CASSANDRA-15250:
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             Summary: Large cartesian produces in IN queries cause the server to run out of memory
                 Key: CASSANDRA-15250
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-15250
             Project: Cassandra
          Issue Type: Bug
          Components: CQL/Interpreter
            Reporter: Avi Kivity


The queries

 

{{    create table tab (pk1 int, pk2 int, pk3 int, pk4 int, pk5 int, pk6 int, pk7 int, pk8 int, pk9 int, primary key((pk1, pk2, pk3, pk4, pk5, pk6, pk7, pk8, pk9)));}}

 

{{    select * from tab where pk1 in (1, 2, 3, 4, 5, 6, 7, 8, 9, 10) and pk2 in (1, 2, 3, 4, 5, 6, 7, 8, 9, 10) and pk3 in (1, 2, 3, 4, 5, 6, 7, 8, 9, 10) and pk4 in (1, 2, 3, 4, 5, 6, 7, 8, 9, 10) and pk5 in (1, 2, 3, 4, 5, 6, 7, 8, 9, 10) and pk6 in (1, 2, 3, 4, 5, 6, 7, 8, 9, 10) and pk7 in (1, 2, 3, 4, 5, 6, 7, 8, 9, 10) and pk8 in (1, 2, 3, 4, 5, 6, 7, 8, 9, 10) and pk9 in (1, 2, 3, 4, 5, 6, 7, 8, 9, 10) ; }}

 

Will cause the server to enter a garbage collection spiral from which it does not recover. The queries generate a large (1 billion row) cartesian product which the server presumably materializes in memory, and fails.

 



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