Hello,
after getting my feet wet with the InternalVertexRunner, I tried packaging a
Giraph job as a jar for the first time.
I am getting the following error:
==========
12/03/20 17:21:04 INFO mapred.JobClient: Task Id :
attempt_201203201422_0009_m_000000_2, Status : FAILED
java.lang.IllegalStateException: onlineZooKeeperServers: Failed to connect in
10 tries!
at
org.apache.giraph.zk.ZooKeeperManager.onlineZooKeeperServers(ZooKeeperManager.java:687)
at org.apache.giraph.graph.GraphMapper.setup(GraphMapper.java:425)
at org.apache.giraph.graph.GraphMapper.run(GraphMapper.java:646)
at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:764)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:370)
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:396)
at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1093)
at org.apache.hadoop.mapred.Child.main(Child.java:249)
attempt_201203201422_0009_m_000000_2: log4j:WARN No appenders could be found
for logger (org.apache.giraph.zk.ZooKeeperManager).
attempt_201203201422_0009_m_000000_2: log4j:WARN Please initialize the log4j
system properly.
=================
Here is some more information, which hopefully might give this mailing list
some insight into what is happening,
because I cant figure it out...
* I am using Hadoop 1.0.1 and giraph svn revision 1293545 (the last one from
February)
* If I run the same Vertex class and Input/OutputFormat using
InternalVertexRunner, then everything works fine. (using again Hadoop 1.0.1 and
giraph rev 1293545)
* I package the giraph job as a selfcontaining jar, and it contains the giraph
jar, as well as the zookeeper jar in its lib dir
(I mostly used the recipe from here
https://exported.wordpress.com/2010/01/30/building-hadoop-job-jar-with-maven/ )
* there was an error in which hadoop could not find a class. And I had to fix
that error with:
giraphJob.setJarByClass(SimpleRDFVertex.class);
* My Vertex class extends HashMapVertex<Text, Text, Text, NullWritable>
* I followed the code example from SimpleShortestPathVertex regarding the run()
method and using the main method to call ToolRunner.run()
Here is the code for my run() method:
==============
@Override
public int run(String[] args) throws Exception {
// takes 3 args: inputDir outputDir numberOfWorkers
GiraphJob job = new GiraphJob(getConf(), getClass().getName());
job.setJarByClass(SimpleRDFVertex.class);
job.setVertexClass(SimpleRDFVertex.class);
job.setVertexInputFormatClass(SimpleRDFVertexInputFormat.class);
job.setVertexOutputFormatClass(SimpleRDFVertexOutputFormat.class);
FileInputFormat.addInputPath(job, new Path(args[0]));
FileOutputFormat.setOutputPath(job, new Path(args[1]));
job.setWorkerConfiguration(Integer.parseInt(args[2]),
Integer.parseInt(args[2]), 100.0f);
return job.run(true) ? 0 : -1;
}
==========
Am I constructing the GiraphJob in the wrong way ?
I saw the GiraphRunner class, but the giraph source tree currently does not
seem to contain an example of how to use that class.
Is it safer to use that class for starting a GiraphJob ?
If yes, how should the job jar be assembled in order to use GiraphRunner ?
sincerely, Benjamin Heitmann.
