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From "Blake Eggleston (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-13786) Validation compactions can cause orphan sstable warnings
Date Wed, 23 Aug 2017 00:50:00 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-13786?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16137691#comment-16137691
] 

Blake Eggleston commented on CASSANDRA-13786:
---------------------------------------------

Yeah for sure. It just seems like changing the interface is an oversize solution to the minor
annoyance of getting periodic warnings in the logs. Maybe we don't need the log entry anymore,
or it can be demoted to info, or there's a solution I haven't though of. That said, there
probably aren't many 3rd party compaction strategies written against vanilla Cassandra these
days.

> Validation compactions can cause orphan sstable warnings
> --------------------------------------------------------
>
>                 Key: CASSANDRA-13786
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13786
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Blake Eggleston
>            Assignee: Blake Eggleston
>            Priority: Minor
>             Fix For: 4.0
>
>
> I've seen LevelledCompactionStrategy occasionally logging: {quote}<sstable_name>
from level 0 is not on corresponding level in the leveled manifest. This is not a problem
per se, but may indicate an orphaned sstable due to a failed compaction not cleaned up properly."{quote}
warnings from a ValidationExecutor thread.
> What's happening here is that a compaction running concurrently with the validation is
promoting (or demoting) sstables as part of an incremental repair, and an sstable has changed
hands by the time the validation compaction gets around to getting scanners for it. The sstable
isolation/synchronization done by validation compactions is a lot looser than normal compactions,
so seeing this happen isn't very surprising. Given that it's harmless, and not unexpected,
I think it would be best to not log these during validation compactions.



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