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https://issues.apache.org/jira/browse/CASSANDRA-9196?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14522693#comment-14522693
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Jeremiah Jordan commented on CASSANDRA-9196:
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This looks like it may be broken for indexes on DynamicCompositeType columns.
Still looking into it, but thought I would post a heads up.
> Do not rebuild indexes if no columns are actually indexed
> ---------------------------------------------------------
>
> Key: CASSANDRA-9196
> URL: https://issues.apache.org/jira/browse/CASSANDRA-9196
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: Sergio Bossa
> Assignee: Sergio Bossa
> Fix For: 2.0.15, 2.1.5
>
> Attachments: 2.0-CASSANDRA-9196.txt, 2.1-CASSANDRA-9196.txt
>
>
> When rebuilding secondary indexes, the index task is executed regardless if
> the actual {{SecondaryIndex#indexes(ByteBuffer )}} implementation of any
> index returns true for any column, meaning that the expensive task of going
> through all sstables and related rows will be executed even if in the end no
> column/row will be actually indexed.
> This is a huge performance hit when i.e. bootstrapping with large datasets on
> tables having custom secondary index implementations whose {{indexes()}}
> implementation might return false.
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