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https://issues.apache.org/jira/browse/CASSANDRA-9018?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14377921#comment-14377921
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Philip Thompson commented on CASSANDRA-9018:
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[~maximp], for advice on better settings, try asking the cassandra user mailing
list, unfortunately I'm not sure what would be the best settings in your case.
For discussions on changing or improving the existing behavior, either open a
new ticket labeled "improvement" or start a discussion on the cassandra dev
mailing list.
> Dropped keyspace is not collected
> ---------------------------------
>
> Key: CASSANDRA-9018
> URL: https://issues.apache.org/jira/browse/CASSANDRA-9018
> Project: Cassandra
> Issue Type: Bug
> Reporter: Maxim Podkolzine
> Attachments: cassandra-log.zip
>
>
> As far as I understand when a keyspace is dropped, the data is marked as
> tombstone. We expect that after the grace period (all tables are created with
> gc_grace_seconds=7200), this data is automatically removed during the
> compaction process, which means that keyspace no longer takes any space on
> disk.
> This is not happening (not after 2 or 24 hours). The log keeps saying "No
> files to compact for user defined compaction", keyspace files remain on disk.
> It's not clear whether Cassandra is still waiting for certain event, or
> decided not to collect the data.
> Is there any setting that I missed? Any clues to figure out from the log,
> what's the current state.
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