Arjun Ashok created CASSANDRA-21357:
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Summary: 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/SSTable
Reporter: Arjun Ashok
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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