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https://issues.apache.org/jira/browse/CASSANDRA-6876?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sergio Bossa updated CASSANDRA-6876:
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Attachment: CASSANDRA-6876.2.1.patch
Attaching patch for 2.1.
> 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
> Attachments: CASSANDRA-6876-2.patch, CASSANDRA-6876.2.1.patch,
> CASSANDRA-6876.patch
>
>
> 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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