smiklosovic commented on code in PR #4300:
URL: https://github.com/apache/cassandra/pull/4300#discussion_r2275974552
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src/java/org/apache/cassandra/index/Index.java:
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@@ -422,6 +422,27 @@ default SSTableFlushObserver getFlushObserver(Descriptor
descriptor, OperationTy
*/
public void validate(PartitionUpdate update) throws
InvalidRequestException;
+
+ /**
+ * When a secondary index is created on a column for a table with e.g.
TWCS strategy,
+ * when this table contains SSTables which are evaluated as fully expired
upon compaction,
+ * they are by default filtered out as they can be dropped in their
entirety. However, once dropped like that,
+ * the index implementation is not notified about this fact via
IndexGCTransaction as compaction on
+ * non-fully expired tables would do. This in turn means that custom index
will never know that some data have
+ * been removed hence data custom index implementation is responsible for
will grow beyond any limit.
+ *
+ * Override this method and return true in index implementation only in
case you want to be notified about
+ * dropped fully-expired data. This will eventually mean that {@link
Indexer#removeRow(Row)} will be called
+ * for rows contained in fully expired table. Return false if you do not
want to be notified like this and
+ * your index is managing fully expired data in other way.
+ *
+ * @return true when fully expired tables should be included in compaction
process, false otherwise.
+ */
+ public default boolean includeFullyExpiredTablesInCompaction()
+ {
+ return false;
Review Comment:
`notifyIndexerAboutRowsInFullyExpiredSSTables` ?
I think this describes what it does the best.
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