[jira] [Created] (CASSANDRA-13005) Cassandra TWCS is not removing fully expired tables

["Christian Esken (JIRA)" <ji...@apache.org>]

Christian Esken created CASSANDRA-13005:
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             Summary: Cassandra TWCS is not removing fully expired tables
                 Key: CASSANDRA-13005
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13005
             Project: Cassandra
          Issue Type: Bug
          Components: Compaction
         Environment: Linux
Cassandra 3.0.5 / Casandra 3.9
            Reporter: Christian Esken
         Attachments: sstablemetadata-empty-type-that-is-3GB.txt

We have a table where all columns are stored with TTL of maximum 4 hours. Usually TWCS compaction properly removes  expired data via tombstone compaction and also removes fully expired tables. The number of SSTables is nearly constant since weeks. Good.

The problem:  Suddenly TWCS does not remove old SSTables any longer. They are being recreated frequently (judging form the filer creation timestamp), but the number of tables is growing.
- sstablemetadata shows strange data, as if the table is completely empty.
- sstabledump throws an Exception when running it on such a SSTable





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