[jira] [Updated] (CASSANDRA-6434) Repair aware gc grace period

["sankalp kohli (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-6434?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

sankalp kohli updated CASSANDRA-6434:
-------------------------------------

    Summary: Repair aware gc grace period   (was: Dont purge tombstones till it is repaired)

> Repair aware gc grace period 
> -----------------------------
>
>                 Key: CASSANDRA-6434
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6434
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Core
>            Reporter: sankalp kohli
>            Priority: Minor
>
> If we don't run repair every gc grace period, forgotten delete problem can happen. This can be very bad for some use cases. 
> To avoid this, the only way is to guaranty that we run repair successfully across the cluster every gc grace period. 
> This is operationally very hard to achieve when we are dealing with lot of nodes. 
> Also repair can fail for many reasons like machine failures, one stable which is bad, etc. 
> So one solution to this is to add a new optional feature(disable by default) which only delete tombstones if repair has successfully run on it instead of relying on gc grace period. We can track the last successful repair time in a system key space. 
> This feature will be very useful for use cases which cannot tolerate data reappearing. 



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