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From "Christian Esken (JIRA)" <>
Subject [jira] [Created] (CASSANDRA-13005) Cassandra TWCS is not removing fully expired tables
Date Tue, 06 Dec 2016 11:11:36 GMT
Christian Esken created CASSANDRA-13005:

             Summary: Cassandra TWCS is not removing fully expired tables
                 Key: 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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