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https://issues.apache.org/jira/browse/CASSANDRA-14532?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16519521#comment-16519521
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Sylvain Lebresne commented on CASSANDRA-14532:
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bq. That would be a real bug, though - worth opening a JIRA there.
Possibly. But remember that being post GCGS is not the _only_ condition on
tombstone for them to be purged: compaction also needs to be able to prove the
tombstone cannot shadow something in another, non-compacted, sstable. So the
sentence is not precise enough to say this is a bug for sure either.
> Partition level deletions past GCGS are not propagated/merged on read
> ---------------------------------------------------------------------
>
> Key: CASSANDRA-14532
> URL: https://issues.apache.org/jira/browse/CASSANDRA-14532
> Project: Cassandra
> Issue Type: Bug
> Reporter: Kurt Greaves
> Assignee: Kurt Greaves
> Priority: Major
>
> So as [~jay.zhuang] mentioned on the mailing list
> [here|http://mail-archives.us.apache.org/mod_mbox/cassandra-dev/201806.mbox/<CAAXszS0%3DmCu5ptDccki_coxRwwF0ZFrTYs_EJLpMTDjNT3tFSA%40mail.gmail.com>],
> it appears that partition deletions that have passed GCGS are not
> propagated/merged properly on read, and also not repaired via read repair.
> Steps to reproduce:
> {code}
> create keyspace test WITH replication = {'class': 'SimpleStrategy',
> 'replication_factor': 3};
> create table test.test (id int PRIMARY KEY , data text) WITH gc_grace_seconds
> = 10;
> CONSISTENCY ALL;
> INSERT INTO test.test (id, data) values (1, 'test');
> ccm node2 stop
> CONSISTENCY QUORUM;
> DELETE from test.test where id = 1; // wait 10 seconds so HH doesn't
> propagate tombstone when starting node2
> select * from test.test where id = 1 ;
> id | data
> ----+------
> (0 rows)
> ccm node2 start
> CONSISTENCY ALL;
> select * from test.test where id = 1 ;
> id | data
> ----+------
> 1 | test
> alter table test.test WITH gc_grace_seconds = 100000; // GC
> select * from test.test where id = 1 ;
> id | data
> ----+------
> (0 rows)
> {code}
> We've also found a seemingly related issue in compaction where trying to
> compact an SSTable which contains the partition deletion post GCGS, the
> partition deletion won't be removed via compaction. Likely the same code is
> causing both bugs.
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