Question

我在cassandra有一个表格，其中有一个MAP类型的列（即）source_id_map map

当我尝试从此表中读取一行时，我发现读取地图类型列时存在一些问题

引起：javax.persistence.PersistenceException： org.apache.cassandra.serializers.MarshalException：意外 map值后的无关字节在com.impetus.client.cassandra.datahandler.CassandraDataHandlerBase.setCollectionValue（CassandraDataHandlerBase.java:2526）在com.impetus.client.cassandra.datahandler.CassandraDataHandlerBase.setFieldValueViaCQL（CassandraDataHandlerBase.java:1504）在com.impetus.client.cassandra.datahandler.CassandraDataHandlerBase.populateViaThrift（CassandraDataHandlerBase.java:1163）在com.impetus.client.cassandra.datahandler.CassandraDataHandlerBase.onColumn（CassandraDataHandlerBase.java:1054）在com.impetus.client.cassandra.datahandler.CassandraDataHandlerBase.populateEntity（CassandraDataHandlerBase.java:653）

我注意到的另一个例外情况如下。

通过CQL检索fieldUTF8Type值时出错，原因如下：。 java.lang.IllegalArgumentException异常 at java.nio.Buffer.limit（Buffer.java:267）在org.apache.cassandra.utils.ByteBufferUtil.readBytes（ByteBufferUtil.java:543） at org.apache.cassandra.utils.ByteBufferUtil.readBytesWithShortLength（ByteBufferUtil.java:552）在org.apache.cassandra.serializers.CollectionSerializer.readValue（CollectionSerializer.java:128）在org.apache.cassandra.serializers.MapSerializer.deserializeForNativeProtocol（MapSerializer.java:104）在com.impetus.client.cassandra.schemamanager.CassandraDataTranslator $ MapTypeBuilder.decompose（CassandraDataTranslator.java:1177）在com.impetus.client.cassandra.schemamanager.CassandraDataTranslator $ MapTypeBuilder.access $ 4800（CassandraDataTranslator.java:1100）在com.impetus.client.cassandra.schemamanager.CassandraDataTranslator.decompose（CassandraDataTranslator.java:507）在com.impetus.client.cassandra.datahandler.CassandraDataHandlerBase.setCollectionValue（CassandraDataHandlerBase.java:2518）在com.impetus.client.cassandra.datahandler.CassandraDataHandlerBase.setFieldValueViaCQL（CassandraDataHandlerBase.java:1504）在com.impetus.client.cassandra.datahandler.CassandraDataHandlerBase.populateViaThrift（CassandraDataHandlerBase.java:1163）在com.impetus.client.cassandra.datahandler.CassandraDataHandlerBase.onColumn（CassandraDataHandlerBase.java:1054）在com.impetus.client.cassandra.datahandler.CassandraDataHandlerBase.populateEntity（CassandraDataHandlerBase.java:653）在com.impetus.client.cassandra.CassandraClientBase $ CQLClient.executeQuery（CassandraClientBase.java:2272）在com.impetus.client.cassandra.CassandraClientBase.executeSelectQuery（CassandraClientBase.java:926）在com.impetus.client.cassandra.thrift.ThriftClient.executeQuery（ThriftClient.java:1062）在com.impetus.client.cassandra.query.CassQuery.populateEntities（CassQuery.java:153）在com.impetus.kundera.query.QueryImpl.fetch（QueryImpl.java:1377）在com.impetus.kundera.query.QueryImpl.getResultList（QueryImpl.java:200）

Answer 1

请在插入和读取数据时启用CQL3

Map propertyMap = new HashMap();
propertyMap.put(CassandraConstants.CQL_VERSION, CassandraConstants.CQL_VERSION_3_0);
EntityManagerFactory emf = Persistence.createEntityManagerFactory("cassandra-pu",propertyMap);

引起：javax.persistence.PersistenceException：org.apache.cassandra.serializers.MarshalException：映射值后出现意外的无关字节

1 个答案: