[jira] [Updated] (CASSANDRA-13943) Infinite compaction of L0 SSTables in JBOD

["Dan Kinder (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-13943?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Dan Kinder updated CASSANDRA-13943:
-----------------------------------
    Attachment: debug.log

> Infinite compaction of L0 SSTables in JBOD
> ------------------------------------------
>
>                 Key: CASSANDRA-13943
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13943
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Compaction
>         Environment: Cassandra 3.11.0 / Centos 6
>            Reporter: Dan Kinder
>         Attachments: debug.log
>
>
> I recently upgraded from 2.2.6 to 3.11.0.
> I am seeing Cassandra loop infinitely compacting the same data over and over. Attaching logs.
> It is compacting two tables, one on /srv/disk10, the other on /srv/disk1. It does create new SSTables but immediately recompacts again. Note that I am not inserting anything at the moment, there is no flushing happening on this table (Memtable switch count has not changed).
> My theory is that it somehow thinks those should be compaction candidates. But they shouldn't be, they are on different disks and I ran nodetool relocatesstables as well as nodetool compact. So, it tries to compact them together, but the compaction results in the exact same 2 SSTables on the 2 disks, because the keys are split by data disk.
> This is pretty serious, because all our nodes right now are consuming CPU doing this for multiple tables, it seems.



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