Question

嘿，我尝试用Casssandra触发器做第一步。触发器应该只获取突变并将其写入一个简单的.txt文件，仅此而已。每次我做一个isert我得到以下错误： java.lang.AbstractMethodError：org.apache.cassandra.triggers.invertedindex.augment（Lorg / apache / cassandra / db / partitions / Partition;）Ljava / util / Collection

代码来自我在互联网上找到的一个例子。

public class invertedindex implements ITrigger

{ // private static final Logger logger = LoggerFactory.getLogger（invertedindex.class）; private Properties properties = loadProperties（）; //私有对象数组;

public void augment(ByteBuffer key, ColumnFamily update) throws IOException
{


        PrintWriter pWriter = null; 
        //long millis2;

       // List<RowMutation> mutations = new ArrayList<>();

        String indexKeySpace = properties.getProperty("keyspace");
        String indexColumnFamily = properties.getProperty("table");
        for (IColumn cell : update)
        {
            // Skip the row marker and other empty values, since they lead to an empty key.
            if (cell.value().remaining() > 0)
            {
                pWriter = new PrintWriter(new BufferedWriter(new FileWriter("log_trigger_test.txt",true)));
                RowMutation mutation = new RowMutation(indexKeySpace, cell.value());
               // mutation.add(properties.getProperty("columnfamily"), cell.name(), cell.value(), System.currentTimeMillis();
               // mutations.add(mutation);
               // mutation.addColumnOrSuperColumn(arg0, arg1);
                //System.out.println((mutation.toString()));
                pWriter.println((mutation.toString()));

            }
        }
        pWriter.close();
       // return mutations;

    }

private static Properties loadProperties()
{
    Properties properties = new Properties();
    InputStream stream = invertedindex.class.getClassLoader().getResourceAsStream("invertedindex.properties");
    try
    {
        properties.load(stream);
    }
    catch (Exception e)
    {
        throw new RuntimeException(e);
    }
    finally
    {
        FileUtils.closeQuietly(stream);
    }

    return properties;
}

}

我在这里做错了什么？有没有关于Casssandra触发任何信息的更多信息？我只发现了一些旧东西？

Answer 1

看起来你正在使用Cassandra 3.x，但已为3.x之前编写了一个触发器。你的触发器应该是：

    public Collection<Mutation> augment(Partition update);

方法

查看触发器示例here，了解如何实现3.x触发器。

Cassandra Trigger java.lang.AbstractMethodError

1 个答案: