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https://issues.apache.org/jira/browse/CASSANDRA-2470?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13021186#comment-13021186
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Jonathan Ellis commented on CASSANDRA-2470:
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I'm thinking that our best bet here is CASSANDRA-2324 (if repair doesn't
transfer a lot more data than necessary, index building will also be faster).
> Secondary Indexes Build Very Slowly
> -----------------------------------
>
> Key: CASSANDRA-2470
> URL: https://issues.apache.org/jira/browse/CASSANDRA-2470
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Benjamin Coverston
> Labels: repair, secondary_index
>
> While running repair I noticed that the time it took to run was easily
> dominated by building the secondary indexes. They currently build at a rate
> of < 200KB/Second. This means that indexing a 500MB file takes nearly an hour
> to index the file.
> Because this happens on the compaction thread it also causes repair to back
> up in general, which for very active systems is a very bad thing.
> I suggest we look at it in the hope that we can improve the rate in which we
> build the indexes by an order of magnitude.
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