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From "Kurt Greaves (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-14532) Partition level deletions past GCGS are not propagated/merged on read
Date Wed, 20 Jun 2018 06:22:00 GMT
Kurt Greaves created CASSANDRA-14532:
----------------------------------------

             Summary: 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


So as [~jay.zhuang] mentioned on the mailing list here, 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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