[CASSANDRA-7766] Secondary index not working after a while

• Type: Bug
• Status: Resolved
• Priority: Normal
• Resolution: Cannot Reproduce
• Component/s: Feature/2i Index

Environment

C* 2.1.0-rc5 with small clusters (one or two nodes)

• Severity: Normal
• Since Version: 2.1 rc2
• Assignee: Unassigned
• Reporter: Fabrice Larcher
• Created: 14/Aug/14 09:10
• Updated: 16/Apr/19 09:31
• Resolved: 29/Sep/14 14:59

Description

Since 2.1.0-rc2, it appears that the secondary indexes are not always working. Immediately after the INSERT of a row, the index seems to be there. But after a while (I do not know when or why), SELECT statements based on any secondary index do not return the corresponding row(s) anymore. I noticed that a restart of C* may have an impact (the data inserted before the restart may be seen through the index, even if it was not returned before the restart).

Here is a use-case example (in order to clarify my request) :

CREATE TABLE IF NOT EXISTS ks.cf ( k int PRIMARY KEY, ind ascii, value text);
CREATE INDEX IF NOT EXISTS ks_cf_index ON ks.cf(ind);
INSERT INTO ks.cf (k, ind, value) VALUES (1, 'toto', 'Hello');
SELECT * FROM ks.cf WHERE ind = 'toto'; // Returns no result after a while

The last SELECT statement may or may not return a row depending on the instant of the request. I experienced that with 2.1.0-rc5 through CQLSH with clusters of one and two nodes. Since it depends on the instant of the request, I am not able to deliver any way to reproduce that systematically (It appears to be linked with some scheduled job inside C*).