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https://issues.apache.org/jira/browse/CASSANDRA-7550?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aleksey Yeschenko resolved CASSANDRA-7550.
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    Resolution: Invalid

Unfortunately, it's not that easy. You can only do it if you are sure that 
there is nothing covered by the tombstone in any of the sstables on this, or 
any other node in the cluster.

> Reduce tombstones
> -----------------
>
>                 Key: CASSANDRA-7550
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7550
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Hanson
>
> If a record is still in Memtable, the Delete to that record shall be done in 
> memory (Make Compaction in memory), instead of placing a tombstone. This way 
> it can save disk I/O and space a lot for records with short lifecycle.



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