Re: [orientdb] Orient DB for graph db gets stuck at iterator

[Luca Garulli]

Hi,

without a test case can you debug what happens inside hasNext() ?

Lvc@

On 24 April 2013 09:42, deepa ganu <deep...@gmail.com> wrote:

I have a graph db , named adtran when i try to search a vertex using this , initially there would be no vertex with propert "peer_slot" , if i get the hasNext() as false then i want to create a vertex , else use the existing vertex 

private  OrientGraph graph = new OrientGraph("remote:localhost/Adtran", "admin", "admin");

 Iterable<Vertex> it = graph.getVertices("peer_slot", etos.getSlotNumber());

Iterator<Vertex> iter = it.iterator();

if(iter.hasNext())

{

v = iter.next();

}

It stucks at hasNext() and does not come out , i have to suspend the thread . What do you think might be the reason .

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[Shishya]

Luca, is there a iterator for Javascript function.

I have to process all the documents stored in a class. So I need a handle to gotNext() after processing each record.

Please advice.

Thanks

[Luca Garulli]

What do you mean? Inside JS function?

Lvc@

[prabhat]

I need to iterate through all vertices which are just a key:value pairs, to extract data and info from them.

One option could be incrementing the RIDs from 0 to count(), but that is not an elegant solution. So if some object which can iterate over records of class is available, that can be really good solution for many such scenarios

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[Luca Garulli]

Hi,

you can execute a query, like:

for( OrientVertex v : graph.command( new OCommandSQL("select from V") ).execute() ){

  ...

}

Lvc@

[prabhat]

I get this error for javascript part of code

!Unrecognized command: 'for( OrientVertex v : graph.command( new OCommandSQL("select from mynodes") ).execute() ){'

-------My code is----------

 connect remote:localhost/database root pass123

for( OrientVertex v : graph.command( new OCommandSQL("select from mynode") ).execute() ){

  print v;

}

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

Regards

[Luca Garulli]

Hi,

In Javascript the syntax of for is different. Try this:

var result = graph.command( new OCommandSQL("select from mynode") ).execute().iterator():

while( result.hasNext() ){

  var v = result.next();

  print v;

}

Lvc@

[prabhat]

I get this heap space error. mynode has 5 million records

Error: com.orientechnologies.orient.enterprise.channel.binary.OResponseProcessingException: Exception during response processing.

Error: java.lang.OutOfMemoryError: Java heap space

I have tuned the server this way

 -d64 -Xms512m -Xmx2g -Dfile.mmap.maxMemory=3.2gb  

Any pointers on tuning plz

Regards

Prabhat Kumar Singh

[prabhat]

Also, execute() iterator() hasNext() are not defined, as I some more errors.

Regards

[Luca Garulli]

Hi,

sorry, JS has a simplified API. Try this:

var result = graph.command( "select from mynode" );

for( v in result ){

  print v;

}