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Posted to commits@cassandra.apache.org by "Hanson (JIRA)" <ji...@apache.org> on 2014/07/15 13:49:04 UTC

[jira] [Commented] (CASSANDRA-7550) Reduce tombstones

    [ https://issues.apache.org/jira/browse/CASSANDRA-7550?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14061974#comment-14061974 ] 

Hanson commented on CASSANDRA-7550:
-----------------------------------

I mean that record is newly inserted and has not been flushed into SSTable yet, only existed in memory at the moment to be deleted. So it shall be safety to do the Delete in memory without putting a tombstone.
In our use case, the records only stay in DB for hours (random duration) and will then be deleted.


> 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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