Apache Can'；不要运行giraph SimpleIndegreeCount计算

我正在尝试运行Giraph中包含的SimpleIndegreeCountComputement示例。我的做法如下：

SimpleInDegreeCountComputation.java：

    public class SimpleInDegreeCountComputation extends BasicComputation
              <LongWritable, LongWritable, DoubleWritable, DoubleWritable> {
    .......

结果如下：

    14/05/18 18:58:40 INFO utils.ConfigurationUtils: No edge input format specified. 
    Ensure your InputFormat does not require one.
    14/05/18 18:58:40 INFO utils.ConfigurationUtils: No edge output format specified.  
    Ensure your OutputFormat does not require one.
    Exception in thread "main" java.lang.IllegalArgumentException: checkClassTypes: vertex  
    value types not assignable, computation - class org.apache.hadoop.io.LongWritable,   
    VertexInputFormat - class org.apache.hadoop.io.DoubleWritable
at org.apache.giraph.job.GiraphConfigurationValidator.checkAssignable(GiraphConfigurationValidator.java:381)
at org.apache.giraph.job.GiraphConfigurationValidator.verifyVertexInputFormatGenericTypes(GiraphConfigurationValidator.java:228)
at org.apache.giraph.job.GiraphConfigurationValidator.validateConfiguration(GiraphConfigurationValidator.java:141)
at org.apache.giraph.utils.ConfigurationUtils.parseArgs(ConfigurationUtils.java:214)
at org.apache.giraph.GiraphRunner.run(GiraphRunner.java:74)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:79)
at org.apache.giraph.GiraphRunner.main(GiraphRunner.java:124)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.apache.hadoop.util.RunJar.main(RunJar.java:156)

    [0,0,[[1,5],[2,9]]]
    [1,0,[[0,5],[3,3]]]
    [2,0,[[0,9],[3,3],[4,3]]]
    [3,0,[[1,3],[2,3],[4,2]]]
    [4,0,[[2,3],[3,3]]]

我不太确定我做错了什么。如果有人能给我指出正确的方向，或者链接到一个资源，解释我正在尝试做的事情的更简单的方式，我将不胜感激！我认为问题可能是格式错误（-vif）。 我使用的输入文件如下所示：

    14/05/18 18:58:40 INFO utils.ConfigurationUtils: No edge input format specified. 
    Ensure your InputFormat does not require one.
    14/05/18 18:58:40 INFO utils.ConfigurationUtils: No edge output format specified.  
    Ensure your OutputFormat does not require one.
    Exception in thread "main" java.lang.IllegalArgumentException: checkClassTypes: vertex  
    value types not assignable, computation - class org.apache.hadoop.io.LongWritable,   
    VertexInputFormat - class org.apache.hadoop.io.DoubleWritable
at org.apache.giraph.job.GiraphConfigurationValidator.checkAssignable(GiraphConfigurationValidator.java:381)
at org.apache.giraph.job.GiraphConfigurationValidator.verifyVertexInputFormatGenericTypes(GiraphConfigurationValidator.java:228)
at org.apache.giraph.job.GiraphConfigurationValidator.validateConfiguration(GiraphConfigurationValidator.java:141)
at org.apache.giraph.utils.ConfigurationUtils.parseArgs(ConfigurationUtils.java:214)
at org.apache.giraph.GiraphRunner.run(GiraphRunner.java:74)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:79)
at org.apache.giraph.GiraphRunner.main(GiraphRunner.java:124)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.apache.hadoop.util.RunJar.main(RunJar.java:156)

    [0,0,[[1,5],[2,9]]]
    [1,0,[[0,5],[3,3]]]
    [2,0,[[0,9],[3,3],[4,3]]]
    [3,0,[[1,3],[2,3],[4,2]]]
    [4,0,[[2,3],[3,3]]]

---

从compute和vertex输入类的定义来看，

JsonLongDoubleFloatDoubleVertexInputFormat

似乎与

SimpleIndegreeCountComputing

不兼容

:

:

/**
*抽象类，用户应将其子类化以使用自己的基于文本的
*顶点输入格式。
*
*@param顶点索引值
*@param顶点值
*@param边值
*/
@抑制警告（“原始类型”）
公共抽象类TextVertexInputFormat
扩展VertexInputFormat{

你可以看到：

• 顶点id的类型为

  longwriteable

• 顶点数据的类型为

  doublewriteable

• 边缘数据的类型为

  floatwriteable

---

由于它是

LongWritable

，

DoubleWritable

和

FloatWritable

而不是

Long

，

Double

和

Float

，这些类型无法自动转换

---

我找不到任何您可以使用的InputFormat，因此您需要修改现有的

JsonLongDoubleFloatDoubleVertexInputFormat

或修改算法以使用

NullWritable

作为边缘数据类型。我看不到任何要使用的边缘数据，因此它也可以为null。在这种情况下，您可以使用。

Hi zahorak！谢谢你的回答。我试过这么做，但现在的问题是创建一个包含修改过的文件的新jar。我不知道怎么做。我解包了giraph-examples-1.1.0-SNAPSHOT-for-hadoop-1.2.1-jar-with-dependencies.jar来查看它是如何制作的。但我仍然无法创建正确的jar文件，因为我没有所有必要的文件（包含在giraph-examples-1.1.0-SNAPSHOT-for-hadoop-1.2.1-jar-with-dependencies.jar中）.有什么建议吗？我在giraph中编写的所有代码，都是在giraph示例中编写的。只需从github签出并编辑它，然后运行

mvn clean install-DskipTests

，您就可以获得所需的所有JAR。我的存储库中是否包含我对giraph示例所做的更改，以便能够运行我的代码。谢谢zahorak。根据你的建议我的解决方案是：1）从github获取代码2）修改文件SimpleIndegreeCountComputing 3）使用mvn创建JAR安装现在可以了：））步骤4）可以是发送一个拉回请求，这样其他人就不会再有这个问题了（但我不确定他们是否会接受）

/**
 * Computation in which both incoming and outgoing message types are the same.
 *
 * @param <I> Vertex id
 * @param <V> Vertex data
 * @param <E> Edge data
 * @param <M> Message type
 */
public abstract class BasicComputation<I extends WritableComparable,
    V extends Writable, E extends Writable, M extends Writable>
    extends AbstractComputation<I, V, E, M, M> {
}

public class JsonLongDoubleFloatDoubleVertexInputFormat extends
    TextVertexInputFormat<LongWritable, DoubleWritable, FloatWritable> {

/**
 * Abstract class that users should subclass to use their own text based
 * vertex input format.
 *
 * @param <I> Vertex index value
 * @param <V> Vertex value
 * @param <E> Edge value
 */
@SuppressWarnings("rawtypes")
public abstract class TextVertexInputFormat<I extends WritableComparable,
    V extends Writable, E extends Writable>
    extends VertexInputFormat<I, V, E> {