root@pseudo-hadoop:/usr/lib/hadoop# bin/hadoop jar $GIRAPH_HOME/giraph-examples/target/giraph-examples-1.1.0-SNAPSHOT-for-hadoop-1.2.1-jar-with-dependencies.jar org.apache.giraph.GiraphRunner org.apache.giraph.examples.SimpleShortestPathsComputation -vif org.apache.giraph.io.formats.JsonLongDoubleFloatDoubleVertexInputFormat -vip /tiny_graph.txt -vof org.apache.giraph.io.formats.IdWithValueTextOutputFormat -op output/shortestpaths -w 1
14/06/12 17:32:32 INFO utils.ConfigurationUtils: No edge input format specified. Ensure your InputFormat does not require one.
14/06/12 17:32:32 INFO utils.ConfigurationUtils: No edge output format specified. Ensure your OutputFormat does not require one.
14/06/12 17:32:32 INFO job.GiraphJob: run: Since checkpointing is disabled (default), do not allow any task retries (setting mapred.map.max.attempts = 0, old value = 4)
14/06/12 17:32:32 WARN mapred.JobClient: Use GenericOptionsParser for parsing the arguments. Applications should implement Tool for the same.
14/06/12 17:32:33 INFO mapred.JobClient: Cleaning up the staging area hdfs://localhost:8020/var/lib/hadoop-hdfs/cache/mapred/mapred/staging/root/.staging/job_201406121249_0012
Exception in thread "main" java.lang.IncompatibleClassChangeError: Found interface org.apache.hadoop.mapreduce.JobContext, but class was expected
at org.apache.giraph.bsp.BspOutputFormat.checkOutputSpecs(BspOutputFormat.java:43)
at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:987)
at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:948)
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:1548)
at org.apache.hadoop.mapred.JobClient.submitJobInternal(JobClient.java:948)
at org.apache.hadoop.mapreduce.Job.submit(Job.java:582)
at org.apache.giraph.job.GiraphJob.run(GiraphJob.java:250)
at org.apache.giraph.GiraphRunner.run(GiraphRunner.java:94)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:84)
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:212)
最佳答案
最初的警告并不重要。
一个java.lang.IncompatibleClassChangeError建议您针对错误版本的Hadoop构建了Giraph。尝试使用正确的配置文件进行构建，例如 mvn -Phadoop_2.0.0软件包
关于hadoop - 在hadoop 2.3.0-cdh-5.0上的Giraph1.1.0上执行示例显示以下错误，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/24184220/