[CASSANDRA-11513] Result set is not unique on primary key (cql)

• Type: Bug
• Status: Resolved
• Priority: Normal
• Resolution: Fixed
• Fix Version/s: 3.6
• Component/s: Legacy/Local Write-Read Paths
• Severity: Normal
• Assignee: Joel Knighton
• Reporter: Tianshi Wang

Authors

Joel Knighton

Reviewers

Sylvain Lebresne

• Created: 06/Apr/16 17:47
• Updated: 16/Apr/19 09:30
• Resolved: 18/Apr/16 13:22

Description

[cqlsh 5.0.1 | Cassandra 3.4 | CQL spec 3.4.0 | Native protocol v4]

Run followings,

drop table if exists test0;
CREATE TABLE test0 (
    pk int,
    a int,
    b text,
    s text static,
    PRIMARY KEY (pk, a)
);

insert into test0 (pk,a,b,s) values (0,1,'b1','hello b1');
insert into test0 (pk,a,b,s) values (0,2,'b2','hello b2');
insert into test0 (pk,a,b,s) values (0,3,'b3','hello b3');
create index on test0 (b);
insert into test0 (pk,a,b,s) values (0,2,'b2 again','b2 again');

Now select one record based on primary key, we got all three records.

cqlsh:ops> select * from test0 where pk=0 and a=2;

 pk | a | s        | b
----+---+----------+----------
  0 | 1 | b2 again |       b1
  0 | 2 | b2 again | b2 again
  0 | 3 | b2 again |       b3

cqlsh:ops> desc test0;

CREATE TABLE ops.test0 (
    pk int,
    a int,
    b text,
    s text static,
    PRIMARY KEY (pk, a)
) WITH CLUSTERING ORDER BY (a ASC)
    AND bloom_filter_fp_chance = 0.01
    AND caching = {'keys': 'ALL', 'rows_per_partition': 'NONE'}
    AND comment = ''
    AND compaction = {'class': 'org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy', 'max_threshold': '32', 'min_threshold': '4'}
    AND compression = {'chunk_length_in_kb': '64', 'class': 'org.apache.cassandra.io.compress.LZ4Compressor'}
    AND crc_check_chance = 1.0
    AND dclocal_read_repair_chance = 0.1
    AND default_time_to_live = 0
    AND gc_grace_seconds = 864000
    AND max_index_interval = 2048
    AND memtable_flush_period_in_ms = 0
    AND min_index_interval = 128
    AND read_repair_chance = 0.0
    AND speculative_retry = '99PERCENTILE';
CREATE INDEX test0_b_idx ON ops.test0 (b);

Issue Links

• is duplicated by: CASSANDRA-11619 "SELECT" returns incorrect result in some cases
• is duplicated by: CASSANDRA-12003 Not filtering Data completely when where clause is applied to clustering column