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From "Ross Black (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-14242) Indexed static column returns inconsistent results
Date Tue, 20 Feb 2018 03:26:00 GMT
Ross Black created CASSANDRA-14242:
--------------------------------------

             Summary: Indexed static column returns inconsistent results
                 Key: CASSANDRA-14242
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14242
             Project: Cassandra
          Issue Type: Bug
         Environment: Cassandra 3.11.2

Java driver 3.4.0

Ubuntu - 4.4.0-112-generic
            Reporter: Ross Black


I am using Cassandra 3.11.2, and the Java driver 3.4.0

I have a table that has a static column, where the static column has a secondary index.
When querying the table I get incomplete or duplicated results, depending on the fetch size.

e.g.
{code:java}
CREATE KEYSPACE hack WITH replication = {'class': 'SimpleStrategy', 'replication_factor':
1};
CREATE TABLE hack.stuff (id int, kind text, chunk int static, val1 int, PRIMARY KEY (id, kind));
CREATE INDEX stuff_chunk_index ON hack.stuff (chunk);{code}

-- repeat with thousands of values for id =>
{code:java}
  INSERT INTO hack.stuff (id, chunk, kind, val1 ) VALUES (${id}, 777, 'A', 123);{code}


Querying from Java:
{code:java}
    final SimpleStatement statement = new SimpleStatement("SELECT id, kind, val1 FROM hack.stuff
WHERE chunk = " + chunk); 
    statement.setFetchSize(fetchSize);
    statement.setConsistencyLevel(ConsistencyLevel.ALL);
    final ResultSet resultSet = connection.getSession().execute(statement);
    for (Row row : resultSet) {
        final int id = row.getInt("id");
    }{code}

*The number of results returned depends on the fetch-size.*

e.g. For 30k values inserted, I get the following:
||fetch-size||result-size||
|40000|30000|
|20000|30001|
|5000|30006|
|100|30303|



In production, I have a much larger table where the correct result size for a specific chunk
is 20019, but some fetch sizes will return _significantly fewer_ results.
||fetch-size||result-size|| ||
|25000|20019| |
|5000|9999|*<== this one is has far fewer results*|
|5001|20026| |

(so far been unable to reproduce this with the simpler test table)

Thanks,
Ross



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