Fabien Rousseau created CASSANDRA-14462:
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Summary: CAS temporarily broken on reversed tables after upgrading
on 2.1.X or 2.2.X
Key: CASSANDRA-14462
URL: https://issues.apache.org/jira/browse/CASSANDRA-14462
Project: Cassandra
Issue Type: Bug
Components: Core
Reporter: Fabien Rousseau
Issue CASSANDRA-12127 changed the way the reversed comparator behaves. Before
scrubbing tables with reversed clustering keys, requests with CAS won't apply
(even if the condition is true).
Below is a simple scenario to reproduce it:
- use C* 2.1.14/2.2.6
- create the schema
{code:java}
CREATE KEYSPACE IF NOT EXISTS test_ks WITH replication = {'class':
'SimpleStrategy', 'replication_factor': 1};
USE test_ks;
CREATE TABLE IF NOT EXISTS test_cf (
pid text,
total int static,
sid uuid,
amount int,
PRIMARY KEY ((pid), sid)
) WITH CLUSTERING ORDER BY (sid DESC);
{code}
- insert data
{code:java}
INSERT INTO test_cf (pid, sid, amount) VALUES ('1',
b2495ad2-9b64-4aab-b000-2ed20dda60ab, 2);
INSERT INTO test_cf (pid, total) VALUES ('1', 2);{code}
- nodetool flush (this is necessary for the scenario to show the problem)
- upgrade to C* 2.1.20/2.2.12
- execute the following queries:
{code:java}
UPDATE test_cf SET total = 3 WHERE pid = '1' IF total = 2;
UPDATE test_cf SET amount = 3 WHERE pid = '1' AND sid =
b2495ad2-9b64-4aab-b000-2ed20dda60ab IF amount = 2;{code}
Both statements won't be applied while they should be applied.
It seems related to the min/maxColumn sstable checks (before the scrubbing, the
min is an empty array, after it is no more) which filter too many sstables.
The SliceQueryFilter.shouldInclude method filter too many SSTables.
Note: When doing a simple "SELECT total FROM test_cf WHERE pid ='1';" works
well because the selected slices are different (and thus do not filter the
sstables).
Note: This does not seem to affect the 3.0.X versions
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