我正在开发一个使用giraph的算法。我正在使用hadoop1.2.1上的1.0.0版本。
我是开发giraph的新手，所以请温柔一点；）
我的自定义作业分为三个包：
io:包含输入和输出格式类
layout：包含vertex类、aggregator类和mastercompute类。
run：包含实现类的工具。
我在eclipse中使用构建的giraph核心jar作为引用对其进行编程，然后将其导出到另一个名为“customjob.jar”的jar中。
以下是我如何在hadoop中启动它：

hadoop jar /opt/hadoop/lib/customJob.jar layout.customrVertex -vif 
 io.JSONLongDoubleFloatDoubleToMapVertexInputFormat -vip /users/hadoop/input/tiny_graph.txt
 -of io.VertexIdAndPositionOutputFormat -op /users/hadoop/output/customJob -w 1

作业开始，进入mapreduce阶段，然后失败：

14/12/16 17:39:35 INFO job.GiraphJob: run: Since checkpointing is disabled (default), do not allow any task retries (setting mapred.map.max.attempts = 0, old value = 4)
14/12/16 17:39:37 INFO mapred.JobClient: Running job: job_201412161121_0025
14/12/16 17:39:38 INFO mapred.JobClient:  map 0% reduce 0%
14/12/16 17:39:49 INFO mapred.JobClient: Job complete: job_201412161121_0025
14/12/16 17:39:49 INFO mapred.JobClient: Counters: 4
14/12/16 17:39:49 INFO mapred.JobClient:   Job Counters 
14/12/16 17:39:49 INFO mapred.JobClient:     SLOTS_MILLIS_MAPS=9487
14/12/16 17:39:49 INFO mapred.JobClient:     Total time spent by all reduces waiting after reserving slots (ms)=0
14/12/16 17:39:49 INFO mapred.JobClient:     Total time spent by all maps waiting after reserving slots (ms)=0
14/12/16 17:39:49 INFO mapred.JobClient:     SLOTS_MILLIS_REDUCES=0

对jobtracker的进一步调查显示，jobsetup失败，出现classnotfoundexception错误：

java.lang.RuntimeException: java.lang.RuntimeException: java.lang.ClassNotFoundException: layout.customVertex
at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:889)
at org.apache.giraph.conf.ClassConfOption.get(ClassConfOption.java:94)
at org.apache.giraph.conf.GiraphClasses.readFromConf(GiraphClasses.java:152)
at org.apache.giraph.conf.GiraphClasses.<init>(GiraphClasses.java:142)
at org.apache.giraph.conf.ImmutableClassesGiraphConfiguration.<init>(ImmutableClassesGiraphConfiguration.java:93)
at org.apache.giraph.bsp.BspOutputFormat.getOutputCommitter(BspOutputFormat.java:56)
at org.apache.hadoop.mapred.Task.initialize(Task.java:515)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:347)
at org.apache.hadoop.mapred.Child$4.run(Child.java:255)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:415)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1190)
at org.apache.hadoop.mapred.Child.main(Child.java:249)
Caused by: java.lang.RuntimeException: java.lang.ClassNotFoundException: layout.customVertex
at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:857)
at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:881)
... 12 more
Caused by: java.lang.ClassNotFoundException: layout.customVertex
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:274)
at org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:810)
at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:855)
... 13 more

hadoop配置是giraph快速入门页面中建议的配置。
如果您能提供任何帮助/建议，我将不胜感激：）
提前谢谢！