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https://issues.apache.org/jira/browse/CASSANDRA-21357?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Nitsan Wakart updated CASSANDRA-21357:
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Component/s: Local/Compaction
> CursorBasedCompaction: prevUnfilteredSize always written as 0 in
> SSTableCursorWriter
> ------------------------------------------------------------------------------------
>
> Key: CASSANDRA-21357
> URL: https://issues.apache.org/jira/browse/CASSANDRA-21357
> Project: Apache Cassandra
> Issue Type: Bug
> Components: Local/Compaction, Local/SSTable
> Reporter: Arjun Ashok
> Priority: Normal
>
> The cursor compaction path always writes 0 for the prevUnfilteredSize field
> in every row and range tombstone marker in Data.db.
> This field records the on-disk byte size of the preceding item in the
> partition, used for efficient reverse-scan iteration. The iterator path
> correctly computes and writes the actual size. While no current read path
> consumes this field, the incorrect value breaks binary SSTable compatibility
> with the iterator path and will break any future reverse-scan implementation.
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