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https://issues.apache.org/jira/browse/CASSANDRA-10442?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Sylvain Lebresne updated CASSANDRA-10442:
-----------------------------------------
Assignee: Benjamin Lerer
> Paging repeats records
> ----------------------
>
> Key: CASSANDRA-10442
> URL: https://issues.apache.org/jira/browse/CASSANDRA-10442
> Project: Cassandra
> Issue Type: Bug
> Reporter: Robert Wille
> Assignee: Benjamin Lerer
>
> Paging repeats records every fetchSize records. The following sample easily
> reproduces the problem on Cassandra 2.0.16 with Java Driver 2.0.11.
> {noformat}
> public class TestPagingBug
> {
> public static void main(String[] args)
> {
> Cluster.Builder builder = Cluster.builder();
> Cluster c = builder.addContactPoints("192.168.98.190").build();
>
> Session s = c.connect();
>
> s.execute("CREATE KEYSPACE IF NOT EXISTS test WITH replication
> = { 'class' : 'SimpleStrategy', 'replication_factor' : 3 }");
> s.execute("CREATE TABLE IF NOT EXISTS test.test_page(id INT,
> sec BIGINT, data VARCHAR static, PRIMARY KEY ((id), sec))");
> s.execute("INSERT INTO test.test_page (id, data) VALUES (1,
> 'asdfasdfasdfasdfasdfasdf')");
>
> PreparedStatement insert = s.prepare("INSERT INTO
> test.test_page (id, sec) VALUES (1, ?)");
> for (int i = 0; i < 1000; i++)
> s.execute(insert.bind((long) i));
>
> PreparedStatement select = s.prepare("SELECT sec FROM
> test.test_page WHERE id = 1");
>
> long lastSec = -1;
> for (Row row : s.execute(select.bind().setFetchSize(300)))
> {
> long sec = row.getLong("sec");
> if (sec == lastSec)
> System.out.println(String.format("Duplicated id
> %d", sec));
>
> lastSec = sec;
> }
> System.exit(0);
> }
> }
> {noformat}
> The program outputs the following:
> Duplicated id 299
> Duplicated id 598
> Duplicated id 897
> Note that the static column is required. This bug doesn't occur if you remove
> the column from the schema.
> I realize that this may be a driver bug, but I don't really know, so I'm
> logging it here until that can be determined.
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