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https://issues.apache.org/jira/browse/CASSANDRA-21423?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Isaac Philip Liu updated CASSANDRA-21423:
-----------------------------------------
    Test and Documentation Plan: 
Added 6 tests in CQLSSTableWriterTest. They check:
 * The bloom filter now matches the number of keys written (sorted and unsorted 
writers, BIG and BTI formats)
 * it still works when the writer splits output into multiple SSTables
 * no filter is written when bloom filters are disabled
                         Status: Patch Available  (was: Open)

> CQLSSTableWriter produces empty bloom filter
> --------------------------------------------
>
>                 Key: CASSANDRA-21423
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-21423
>             Project: Apache Cassandra
>          Issue Type: Improvement
>          Components: Local/SSTable
>            Reporter: Lukasz Antoniak
>            Assignee: Isaac Philip Liu
>            Priority: Normal
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> CQLSSTableWriter produces empty Filter.db files when flushing SSTables. This 
> causes Cassandra nodes to skip Bloom filter checks on imported SSTables, 
> resulting in unnecessary disk reads for every partition key lookup.



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