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Posted to commits@cassandra.apache.org by "sankalp kohli (JIRA)" <ji...@apache.org> on 2013/12/02 23:30:37 UTC
[jira] [Created] (CASSANDRA-6434) Dont purge tombstones till it is
repaired
sankalp kohli created CASSANDRA-6434:
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Summary: Dont purge tombstones till it is repaired
Key: CASSANDRA-6434
URL: https://issues.apache.org/jira/browse/CASSANDRA-6434
Project: Cassandra
Issue Type: New Feature
Components: Core
Reporter: sankalp kohli
Priority: Critical
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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