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From "Sylvain Lebresne (JIRA)" <>
Subject [jira] Commented: (CASSANDRA-2305) Tombstoned rows not purged after gcgraceseconds
Date Thu, 10 Mar 2011 18:49:59 GMT


Sylvain Lebresne commented on CASSANDRA-2305:

Oups, my mistake. I somehow confused myself. I was not able to reproduce though, but I'll
try harder tomorrow.

> Tombstoned rows not purged after gcgraceseconds
> -----------------------------------------------
>                 Key: CASSANDRA-2305
>                 URL:
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 0.7.0
>            Reporter: Jeffrey Wang
>            Assignee: Sylvain Lebresne
>            Priority: Minor
>             Fix For: 0.7.4
> From email to list:
> I was wondering if this is the expected behavior of deletes (0.7.0). Let's say I have
a 1-node cluster with a single CF which has gc_grace_seconds = 0. The following sequence of
operations happens (in the given order):
> insert row X with timestamp T
> delete row X with timestamp T+1
> force flush + compaction
> insert row X with timestamp T
> My understanding is that the tombstone created by the delete (and row X) will disappear
with the flush + compaction which means the last insertion should show up. My experimentation,
however, suggests otherwise (the last insertion does not show up).
> I believe I have traced this to the fact that the markedForDeleteAt field on the ColumnFamily
does not get reset after a compaction (after gc_grace_seconds has passed); is this desirable?
I think it introduces an inconsistency in how tombstoned columns work versus tombstoned CFs.

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