Perché cassandra lanciando com.datastax.driver.core.exceptions.invalidqueryexception: Definizioni multiple trovate per colonna
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02-01-2020 - |
Domanda
Context :
Sto usando un test di Junit in Eclipse utilizzando Cassandra incorporato per testare la mia classe DAO che utilizza un client ASTYANAX configurato per JavaDriver.Quando l'istanza dell'oggetto DAO inserisce in Cassandra, sto ottenendo questa eccezione com.datastax.driver.core.exceptions.invalidqueryexception: definizioni multiple trovate per colonna ..ColumnName
TestClass
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();
}
}
.
classe sotto test
@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);
}
}
}
. Soluzione
Quando il driver Java lancia un InvalidQueryException
, è un errore di un errore da Cassandra.L'errore "Definizioni multiple trovate per colonna ..." indica che una colonna viene menzionata più di una volta in un'istruzione di aggiornamento.Puoi simularlo in 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"
.
Non ho familiarità con Astyanax, ma la mia ipotesi è che aggiunge già l'ID alla query quando si chiama withRow
, quindi non è necessario aggiungerlo di nuovo con putColumn
.Prova a rimuovere quella chiamata (seconda riga in campione riformattato di seguito):
m.withRow(cf, lb.getLbId())
.putColumn(LEADERBOARD_ID, UUIDUtil.asByteArray(lb.getLbId()), null)
... // other putColumn calls
.