Question

我是astyanax的新手并尝试了一些示例程序并收到此错误。这是一个简单的写法，看起来像是在做一些基本错误的事情。不使用复合键。

Caused by: InvalidRequestException(why:Not enough bytes to read value of component 0)
    at org.apache.cassandra.thrift.Cassandra$batch_mutate_result.read(Cassandra.java:20833)
    at org.apache.thrift.TServiceClient.receiveBase(TServiceClient.java:78)
    at org.apache.cassandra.thrift.Cassandra$Client.recv_batch_mutate(Cassandra.java:964)
    at org.apache.cassandra.thrift.Cassandra$Client.batch_mutate(Cassandra.java:950)
    at com.netflix.astyanax.thrift.ThriftKeyspaceImpl$1$1.internalExecute(ThriftKeyspaceImpl.java:120)
    at com.netflix.astyanax.thrift.ThriftKeyspaceImpl$1$1.internalExecute(ThriftKeyspaceImpl.java:117)
    at com.netflix.astyanax.thrift.AbstractOperationImpl.execute(AbstractOperationImpl.java:56)

以下是代码：

    AstyanaxContext<Keyspace> context = new AstyanaxContext.Builder()
        .forCluster(CLUSTER_NAME)
        .forKeyspace(keySpaceName)
        .withAstyanaxConfiguration(new AstyanaxConfigurationImpl()      
            .setDiscoveryType(NodeDiscoveryType.RING_DESCRIBE)
            .setCqlVersion("3.0.0")
            .setTargetCassandraVersion("1.2")
        )
        .withConnectionPoolConfiguration(new ConnectionPoolConfigurationImpl("MyConnectionPool")
            .setPort(50825)
            .setMaxConnsPerHost(10)
            .setSeeds("nodename:50825")
            .setConnectTimeout(20000)
        )
        .withConnectionPoolMonitor(new CountingConnectionPoolMonitor())
        .buildKeyspace(ThriftFamilyFactory.getInstance());

    context.start();
    System.out.println("getting context.. done ");
    Keyspace keyspace = context.getEntity();
    MutationBatch m = keyspace.prepareMutationBatch();

    ColumnFamily<String, String> colFam = new ColumnFamily<String, String>("test",
            StringSerializer.get(), StringSerializer.get());

    m.withRow(colFam, "abc")
        .putColumn("col2", "test1", null);
    m.execute();

以下表格描述：

CREATE TABLE test (
 col1 text PRIMARY KEY,
 col2 text,
 col3 text
) WITH
 bloom_filter_fp_chance=0.010000 AND
 caching='KEYS_ONLY' AND
 comment='' AND
 dclocal_read_repair_chance=0.000000 AND
 gc_grace_seconds=864000 AND
 read_repair_chance=0.100000 AND
 replicate_on_write='true' AND
 populate_io_cache_on_flush='false' AND
 compaction={'class': 'SizeTieredCompactionStrategy'} AND
 compression={'sstable_compression': 'SnappyCompressor'};

Answer 1

我也是Astyanax的新手并遇到了同样的例外情况。例外情况是由于基于Astyanax Thrift的对象认为列定义应该看起来与使用CQL 3在1.2+中存储的方式不匹配。我学会了指定COMPACT STORAGE以便以1.2格式创建表格将允许我通过基于Thrift的对象与它进行交互。 FWIW：我是从源头建立Astyanax，但我确实看到了maven中心的1.56.34;我也会更新。

CREATE TABLE test (
 col1 text PRIMARY KEY,
 col2 text,
 col3 text
) WITH COMPACT STORAGE AND
...

请参阅Working with pre-CQL 3 applications

Answer 2

我用user2251060提供的解决方案完成了这项工作。此外，Netflix正在开发一个新版本的Astyanax，它依赖于Datastax java驱动程序将thrift对象转换为基础的基于CQL的对象。您可以在https://github.com/Netflix/astyanax/wiki/Astyanax-over-Java-Driver

找到更多信息

Astyanax：简单写入抛出此异常：没有足够的字节来读取组件的值

2 个答案: