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From "Sergio Bossa (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-6876) Improve PerRowSecondaryIndex performance by removing O(N) complexity when computing indexes for a column
Date Mon, 17 Mar 2014 18:23:46 GMT
Sergio Bossa created CASSANDRA-6876:
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             Summary: Improve PerRowSecondaryIndex performance by removing O(N) complexity
when computing indexes for a column
                 Key: CASSANDRA-6876
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6876
             Project: Cassandra
          Issue Type: Improvement
          Components: Core
            Reporter: Sergio Bossa
            Assignee: Sergio Bossa
            Priority: Minor


Currently, given SecondaryIndexManager tracks all per-column and per-row secondary indexes
in a by-column map, when computing indexes for a given column it has to scan all indexes for
*all* columns, meaning that it will scan the *same* per-row index N times, where N is the
number of columns it is associated with, raising the complexity of what could be an O(1) operation
to O(N).



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