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https://issues.apache.org/jira/browse/CASSANDRA-325?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12737167#action_12737167
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Jun Rao commented on CASSANDRA-325:
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I won't mind getting rid of the column-level BF for now. Just a few more
comments.
Yes, we are deserializing the whole column index (for every read). However, the
column index is not dense and doesn't tell you exactly whether a column or a
list of columns exist. So, by using a BF, one could save an extra I/O if the
column is not present.
> Column bloomfilter not exploited
> --------------------------------
>
> Key: CASSANDRA-325
> URL: https://issues.apache.org/jira/browse/CASSANDRA-325
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: Jun Rao
>
> There is a bloomfilter created for all columns per row in SSTables. The
> bloomfilter is deserialized during read, but is not checked.
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