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From "Christian Esken (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-13005) Cassandra TWCS is not removing fully expired tables
Date Thu, 08 Dec 2016 11:58:58 GMT


Christian Esken commented on CASSANDRA-13005:

I can do that. I could provide a patch for it. The HowToContribute mentions I can do it also
via GitHub, which I would prefer.

> Cassandra TWCS is not removing fully expired tables
> ---------------------------------------------------
>                 Key: CASSANDRA-13005
>                 URL:
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Compaction
>         Environment: Cassandra 3.0.9
> Java HotSpot(TM) 64-Bit Server VM version 25.112-b15 (Java version 1.8.0_112-b15)
> Linux 3.16
>            Reporter: Christian Esken
>              Labels: twcs
>         Attachments: sstablemetadata-empty-type-that-is-3GB.txt
> I 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 file creation timestamp), but the number of tables is growing.
Analysis and actions take so far:
> - sstablemetadata shows strange data, as if the table is completely empty.
> - sstabledump throws an Exception when running it on such a SSTable
> - Even triggering a manual major compaction will not remove the old SSTable's. To be
more precise: They are recreated with new id and timestamp (not sure whether they are identical
as I cannot inspect content due to the sstabledump crash)

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