I'm not familiar any that are particular toward graphs, sorry.  You can always store/query your graph data in the systems I suggested earlier.

Avery

On 12/14/11 5:23 PM, Praveen Sripati wrote:
Avery,

Thanks for the response. Are there any open source frameworks for online querying of Graphs?

Regards,
Praveen

On Thu, Dec 15, 2011 at 12:37 AM, Avery Ching <aching@apache.org> wrote:
Hi Praveen,

You are right that Giraph is an offline graph computation infrastructure, not an online graph database.  You could try using MySQL, HBase, Cassandra, etc for online querying.

Avery


On 12/14/11 10:24 AM, Praveen Sripati wrote:
Hi,

If I am not wrong Giraph is for batch processing similar to Hadoop. But, when I look for directions in Google Maps, the directions are returned within seconds. The 'shortest path algorithm' might be used. Are there any frameworks to get instantaneous results from graphs from distributed systems?

Regards,
Praveen