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From Anuj Wadehra <>
Subject Expiring Columns
Date Mon, 21 Mar 2016 12:18:51 GMT
I want to understand how Expiring columns work in Cassandra.

Query:Documentation says that once TTL of a column expires, tombstones are created/ marked
when the sstable gets compacted. Is there a possibility that a query (range scan/ row query)
returns expired column data just because the sstable never participated in a compaction after
TTL of the column expired?
For Example:  10 AM Data inserted with ttl=60 seconds  10:05 AM A query is run on inserted
data  10:07 AM sstable is compacted and column     is marked tombstone.
Will the query return expired data in above scenario? If yes/no, why?


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