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From "Christian Esken (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-13005) Cassandra TWCS is not removing fully expired tables
Date Mon, 16 Jan 2017 09:00:40 GMT


Christian Esken commented on CASSANDRA-13005:

Adding an additional observation on  the event of Jam 13: Most or all "missing" files appeared
after some time. It seems like some background process creates those files, but sometimes
it takes quite some time and also it happens for multiple tables. For example at some time
I was checking and files from 13 SSTables were missing (overall 78 files).

> 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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