[jira] [Updated] (CASSANDRA-4667) optimize memtable deletions for batchlog

["Aleksey Yeschenko (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-4667?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Aleksey Yeschenko updated CASSANDRA-4667:
-----------------------------------------

    Attachment: CASSANDRA-4667-v1.patch
    
> optimize memtable deletions for batchlog
> ----------------------------------------
>
>                 Key: CASSANDRA-4667
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4667
>             Project: Cassandra
>          Issue Type: Sub-task
>            Reporter: Aleksey Yeschenko
>            Assignee: Aleksey Yeschenko
>         Attachments: CASSANDRA-4667-v1.patch
>
>
> Batchlog writes with the same key are never retried. This means that if a batchlog row is in the memtable, it can't be in any of the sstables, ever. In such cases we don't need to write a tombstone to disk. We can purge the row completely from the memtable and only write a tombstone if the row had been flushed already (if it's not in the memtable then it must be in one of the sstables).

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