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https://issues.apache.org/jira/browse/CASSANDRA-16092?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17347160#comment-17347160
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Caleb Rackliffe commented on CASSANDRA-16092:
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[~jasonstack] So I've finished my first pass at review and left my comments for
the minor things [inline|https://github.com/apache/cassandra/pull/735]. This is
obviously a selected chunk of a much larger project, but there has been
reasonable care taken to test, at least at the unit level, the new concepts
like queryability and index group management in {{SecondaryIndexManager}}
without a real multi-index group in play. Overall, things are looking pretty
good!
> Add Index Group Interface for Storage Attached Index
> ----------------------------------------------------
>
> Key: CASSANDRA-16092
> URL: https://issues.apache.org/jira/browse/CASSANDRA-16092
> Project: Cassandra
> Issue Type: New Feature
> Components: Feature/SASI
> Reporter: Zhao Yang
> Assignee: Zhao Yang
> Priority: Normal
> Fix For: 4.x
>
>
> [Index
> group|https://github.com/datastax/cassandra/blob/storage_attached_index/src/java/org/apache/cassandra/index/Index.java#L634]
> interface allows:
> * indexes on the same table to receive centralized lifecycle events called
> secondary index groups. Sharing of data between multiple column indexes on
> the same table allows SAI disk usage to realise significant space savings
> over other index implementations.
> * index-group to analyze user query and provide a query plan that leverages
> all available indexes within the group.
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