Por qué Cassandra lanza com.datastax.driver.core.exceptions.InvalidQueryException:Se encontraron múltiples definiciones para la columna

Question

Contexto:

Estoy ejecutando una prueba jUnit en eclipse usando Cassandra integrada para probar mi clase DAO que usa un cliente Astyanax configurado para JavaDriver.Cuando la instancia del objeto DAO se inserta en Cassandra, obtengo esta excepción com.datastax.driver.core.exceptions.InvalidQueryException:Se encontraron múltiples definiciones para la columna ..nombredecolumna

Clase de prueba

public class LeaderBoardDaoTest {

    private static LeaderBoardDao   dao;
    public static CassandraCQLUnit  cassandraCQLUnit;

    private String                  hostIp  = "127.0.0.1";
    private int                     port    = 9142;
    public Session                  session;
    public Cluster                  cluster;

    @BeforeClass
    public static void startCassandra() throws IOException, TTransportException, ConfigurationException, InterruptedException {
        System.setProperty("archaius.deployment.applicationId", "leaderboardapi");
        System.setProperty("archaius.deployment.environment", "test");

        EmbeddedCassandraServerHelper.startEmbeddedCassandra("cassandra.yaml");
        // cassandraCQLUnit = new CassandraCQLUnit(new
        // ClassPathCQLDataSet("simple.cql", "lbapi"), "cassandra.yaml");
        Injector injector = Guice.createInjector(new TestModule());
        dao = injector.getInstance(LeaderBoardDao.class);

    }

    @Before
    public void load() {
        cluster = new Cluster.Builder().withClusterName("leaderboardcassandra").addContactPoints(hostIp).withPort(port).build();
        session = cluster.connect();
        CQLDataLoader dataLoader = new CQLDataLoader(session);
        dataLoader.load(new ClassPathCQLDataSet("simple.cql", "lbapi"));
        session = dataLoader.getSession();
    }


    @Test
    public void test() {
        ResultSet result = session.execute("select * from mytable WHERE id='myKey01'");
        Assert.assertEquals(result.iterator().next().getString("value"), "myValue01");
    }

    @Test
    public void testInsert() {
        LeaderBoard lb = new LeaderBoard();
        lb.setName("name-1");
        lb.setDescription("description-1");
        lb.setActivityType(ActivityType.FUEL);
        lb.setImage("http:/");
        lb.setLbId(UUID.fromString("3F2504E0-4F89-41D3-9A0C-0305E82C3301"));
        lb.setStartTime(new Date());
        lb.setEndTime(new Date());
        dao.insert(lb);
        ResultSet resultSet = session.execute("select * from leaderboards WHERE leaderboardid='3F2504E0-4F89-41D3-9A0C-0305E82C3301'");
    }

    @After
    public void clearCassandra() {
        EmbeddedCassandraServerHelper.cleanEmbeddedCassandra();
    }

    @AfterClass
    public static void stopCassandra() {
        EmbeddedCassandraServerHelper.stopEmbeddedCassandra();
    }
}

Clase bajo prueba

@Singleton
public class LeaderBoardDao {

    private static final Logger                 log                 = LoggerFactory.getLogger(LeaderBoardDao.class);

    @Inject
    private AstyanaxMutationsJavaDriverClient   client;

    private static final String                 END_TIME            = "end_time";
    private static final String                 START_TIME          = "start_time";
    private static final String                 IMAGE               = "image";
    private static final String                 ACTIVITY_TYPE       = "activity_type";
    private static final String                 DESCRIPTION         = "description";
    private static final String                 NAME                = "name";
    private static final String                 LEADERBOARD_ID      = "leaderboardID";
    private static final String                 COLUMN_FAMILY_NAME  = "leaderboards";

    private ColumnFamily<UUID, String>          cf;

    public LeaderBoardDao() throws ConnectionException {
        cf = ColumnFamily.newColumnFamily(COLUMN_FAMILY_NAME, UUIDSerializer.get(), StringSerializer.get());
    }

    /**
     * Writes the Leaderboard to the database.
     * 
     * @param lb
     */
    public void insert(LeaderBoard lb) {
        try {
            MutationBatch m = client.getKeyspace().prepareMutationBatch();
            cf.describe(client.getKeyspace());
            m.withRow(cf, lb.getLbId()).putColumn(LEADERBOARD_ID, UUIDUtil.asByteArray(lb.getLbId()), null).putColumn(NAME, lb.getName(), null).putColumn(DESCRIPTION, lb.getDescription(), null)
                    .putColumn(ACTIVITY_TYPE, lb.getActivityType().name(), null).putColumn(IMAGE, lb.getImage()).putColumn(START_TIME, lb.getStartTime()).putColumn(END_TIME, lb.getEndTime());

            m.execute();
        } catch (ConnectionException e) {
            Throwables.propagate(e);
        }
    }

    /**
     * Reads leaderboard from database
     * 
     * @param id
     * @return {@link LeaderBoard}
     */
    public LeaderBoard read(UUID id) {
        OperationResult<ColumnList<String>> result;
        LeaderBoard lb = null;
        try {
            result = client.getKeyspace().prepareQuery(cf).getKey(id).execute();

            ColumnList<String> cols = result.getResult();
            if (!cols.isEmpty()) {
                lb = new LeaderBoard();
                lb.setLbId(cols.getUUIDValue(LEADERBOARD_ID, null));
                lb.setName(cols.getStringValue(NAME, null));
                lb.setActivityType(ActivityType.valueOf(cols.getStringValue(ACTIVITY_TYPE, null)));
                lb.setDescription(cols.getStringValue(DESCRIPTION, null));
                lb.setEndTime(cols.getDateValue(END_TIME, null));
                lb.setStartTime(cols.getDateValue(START_TIME, null));
                lb.setImage(cols.getStringValue(IMAGE, null));
            } else {
                log.warn("read: is empty: no record found for " + id);
            }

            return lb;
        } catch (ConnectionException e) {
            log.error("failed to read from C*", e);
            throw new RuntimeException("failed to read from C*", e);
        }
    }

}

Answer 1

Cuando el controlador Java arroja un InvalidQueryException, está volviendo a generar un error de Cassandra.El error "Se encontraron varias definiciones para la columna..." indica que una columna se menciona más de una vez en una declaración de actualización.Puedes simularlo en cqlsh:

cqlsh> create table test(i int primary key);
cqlsh> insert into test (i, i) values (1, 2);
code=2200 [Invalid query] message="Multiple definitions found for column i"

No estoy familiarizado con Astyanax, pero supongo que ya agrega la identificación a la consulta cuando llamas withRow, por lo que no es necesario volver a agregarlo con putColumn.Intente eliminar esa llamada (segunda línea en el ejemplo reformateado a continuación):

m.withRow(cf, lb.getLbId())
 .putColumn(LEADERBOARD_ID, UUIDUtil.asByteArray(lb.getLbId()), null)
 ... // other putColumn calls