Ngoc Minh Vo created CASSANDRA-7041: ---------------------------------------
Summary: Select query returns inconsistent result Key: CASSANDRA-7041 URL: https://issues.apache.org/jira/browse/CASSANDRA-7041 Project: Cassandra Issue Type: Bug Components: Core Environment: Cassandra v2.0.6 (upgraded from v2.0.3) 4-node cluster: Windows7, 12GB JVM Reporter: Ngoc Minh Vo Priority: Critical Hello, We are running in an issue with C* v2.0.x: CQL queries randomly return empty result. Here is the scenario: 1. Schema: {noformat} CREATE TABLE string_values ( date int, field text, value text, PRIMARY KEY ((date, field), value) ) WITH bloom_filter_fp_chance=0.100000 AND caching='KEYS_ONLY' AND comment='' AND dclocal_read_repair_chance=0.000000 AND gc_grace_seconds=864000 AND index_interval=128 AND read_repair_chance=0.100000 AND replicate_on_write='true' AND populate_io_cache_on_flush='false' AND default_time_to_live=0 AND speculative_retry='99.0PERCENTILE' AND memtable_flush_period_in_ms=0 AND compaction={'class': 'LeveledCompactionStrategy'} AND compression={'sstable_compression': 'LZ4Compressor'}; {noformat} 2. There is no new data imported to the cluster during the test. 3. CQL query: {noformat} select * from string_values where date=20140122 and field='SCONYKSP1'; {noformat} 4. In Cqlsh, the same query has been executed several times during a short interval (~1-2 seconds). The first query results are empty and then we got the data. And from that point, we always get the correct result: {noformat} cqlsh:titan_test> select * from string_values where date=20140122 and field='SCONYKSP1'; (0 rows) cqlsh:titan_test> select * from string_values where date=20140122 and field='SCONYKSP1'; (0 rows) ... ... cqlsh:titan_test> select * from string_values where date=20140122 and field='SCONYKSP1'; (0 rows) cqlsh:titan_test> select * from string_values where date=20140122 and field='SCONYKSP1'; (0 rows) cqlsh:titan_test> select * from string_values where date=20140122 and field='SCONYKSP1'; date | field | value ----------+-----------+------------------------- 20140122 | SCONYKSP1 | 201401220251826297a_0_3 (1 rows) cqlsh:titan_test> select * from string_values where date=20140122 and field='SCONYKSP1'; date | field | value ----------+-----------+------------------------- 20140122 | SCONYKSP1 | 201401220251826297a_0_3 (1 rows) {noformat} 5. It might relate to some kind of "warmup" process. We tried to disable key/data caching but it does not help. Upgrading cluster from v2.0.3 to v2.0.6 does not fix the issue (hence, not related to CASSANDRA-6555). Long time ago, we posted a report on Java Driver JIRA: https://datastax-oss.atlassian.net/browse/JAVA-217. But it seems that the issue is in the server side. Best regards, Minh -- This message was sent by Atlassian JIRA (v6.2#6252)