npapa / h2rdf Goto Github PK

What steps will reproduce the problem?

-->hadoop jar H2RDF_server.jar sampler.SamplerEx input_Path HBaseTable

What is the expected output? What do you see instead?

-->hadoop job is ok.but when import hbase table,the information below showed

--------------------

14/04/01 23:35:32 WARN ipc.HBaseClient: Unexpected exception receiving call 
responses
java.lang.OutOfMemoryError: Java heap space
        at java.lang.reflect.Array.newArray(Native Method)
        at java.lang.reflect.Array.newInstance(Array.java:52)
        at org.apache.hadoop.hbase.io.HbaseObjectWritable.readObject(HbaseObjectWritable.java:542)
        at org.apache.hadoop.hbase.io.HbaseObjectWritable.readFields(HbaseObjectWritable.java:289)
        at org.apache.hadoop.hbase.ipc.HBaseClient$Connection.receiveResponse(HBaseClient.java:593)
        at org.apache.hadoop.hbase.ipc.HBaseClient$Connection.run(HBaseClient.java:505)

-----------



What version of the product are you using? On what operating system?
1.i install hadoop-1.0.1 and hbase-0-92.0 and  zookeeper-3.3.2； 
2.install h2rdf 0.3

Please provide any additional information below.

>

What steps will reproduce the problem?
1.The current hadoop and hbase configuration is pseudo distributed mode.

2. The code which was said to be run is from partialJoin.Ex2.java which 
contained commented lines which demonstrated the mapreduce operation, which we 
later uncommented for execution.

3. We also commented mapred.fairscheduler.pool configuration lines to disable 
the pool name as we use the default one.

4. When the algorithm is set to 'map reduce' by using 1, we are getting FATAL 
org.apache.hadoop.mapred.Child: Error running 
child:java.lang.noClassDefFoundError: javaewah/EWAHCompressedBitmap

5. The data is generated using 
gr.ntua.h2rdf.examples.HbaseSequentialImportExample in H2RDF client. The 
following code is used for generating:

for (int i = 1; i < 10; i++) {
Node s = Node.createURI("<"+d0_0+"GraduateStudent"+i+">");              
Node p = Node.createURI("<"+rdf+"type"+">");                    
Node o = Node.createURI("<"+arco+"term"+">");                   
Triple triple = Triple.create(s, p, o); 
store.add(triple);
s=Node.createURI("<"+d0_0+"GraduateStudent"+i+">");
p=Node.createURI("<"+arco+"kyotoDomainRelevance"+">");                  o=Node.createURI("\"8
0\"^^<http://www.w3.org/2001/XMLSchema#double>");           triple=Triple.create(s, p, 
o); 
store.add(triple);  
s=Node.createURI("<"+d0_0+"GraduateStudent"+i+">");                 p=Node.createURI("<http:
//www.w3.org/2000/01/rdf-schema#label>");           
o=Node.createURI("<"+d0_0+"Label"+i+">");                       triple=Triple.create(s, p, 
o);                     store.add(triple);              
}

What is the expected output? What do you see instead?
 The query I am using is in partialJoin.Ex2.java: 
String prolog = "PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>"+
"PREFIX arco: <http://www.gate.ac.uk/ns/ontologies/arcomem-data-model.rdf#>" +
"PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>";

String NL = System.getProperty("line.separator") ;
String q = prolog + NL +
    "SELECT ?termInstance ?score ?termLabel " +
    "WHERE   { ?termInstance rdf:type arco:Term . " +
    "?termInstance arco:kyotoDomainRelevance ?score ." +
    "?termInstance rdfs:label ?termLabel . " +
    " }";

As you can see, I am expecting the entire table contents to be viewed but the 
map reduce itself is not working.

What version of the product are you using? On what operating system?

The OS used is RHEL6.0 and the hbase used is 0.92.0 while hadoop is 0.20.205.0 
and zookeper is 3.4.3. We tried to use javaewah 0.5.2 version instead of 0.3.2 
for trying to resolve the run time error. And also added the jar for javaewah 
in hadoop and hbase folders which we are using just in case it was searching 
for the jar in those lib directories and was unable to find it.  

Please provide any additional information below.
I have attached the stacktrace error as well as the Ex2.java program that we 
are using. 

Kindly let us know what exactly we are supposed to do to execute map reduce 
job.  

Hi niko,
I want to install h2rdf-0.2 on Rhel6.
I didn't get proper document having h2rdf configuration details.please help me 
on this issue.

my mail id: [email protected]

Thanks,
Yerriswamy.A