[jira] [Commented] (CASSANDRA-18528) Anticompaction triggered during repair when it's not needed

["Maciej Sokol (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-18528?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17728243#comment-17728243 ] 

Maciej Sokol commented on CASSANDRA-18528:
------------------------------------------

I found this while i was looking at the code but the reasoning doesn't make sense to me.

https://issues.apache.org/jira/browse/CASSANDRA-13818

 

> Anticompaction triggered during repair when it's not needed
> -----------------------------------------------------------
>
>                 Key: CASSANDRA-18528
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-18528
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Maciej Sokol
>            Priority: Normal
>
> I've been testing repair and different options and comparing Cassandra 4 to Cassandra 3.11.
> What i've discovered is some strange behavior in Cassandra 4, mainly when it comes to anticompaction. Anticompaction seems to be triggered when "–full" is not provided.
> I.e this will trigger anticompaction in Cassandra 4, but not in Cassandra 3.11:
> nodetool repair --in-dc datacenter1
> nodetool repair -st 5 -et 10
> The easiest way to observe this is to:
>  * Disable autocompaction for a table
>  * Run repair for a table
>  * Observe the diskspace, every time a repair is triggered the diskspace increases by like 30% (not the case when used with --full)
> On top of that, even though anticompaction is triggered, the timestamp is not set on SSTables. It remains as 0. I don't really see any point in doing anticompaction, either we do anticompaction and set the timestamp or we don't do both.



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