JNDI lookup on a specific server node

Question

Hi experts
I am facing the following issue, we are loading data from ECC tables on PI JAVA memory to improve performance at runtime, this is done by a JCO,
it works fine within one Java node. But when we tested it in Productive system (with 2 java nodes) it failed because data is stored in just one Java node, so if the message does not go through
that node it does not find that data.
This is part ofe the code from the UDF where we are loading data to java memory:
props.put(javax.naming.Context.INITIAL_CONTEXT_FACTORY, "com.sap.engine.services.jndi.InitialContextFactoryImpl");
*                         props.put(javax.naming.Context.PROVIDER_URL, "sapms://localhost:8110     ");*
*                         props.put("domain", "true");*
And this is part of the code from the UDF where we are getting data from memory
javax.naming.Context ctx = null;
*          java.util.Hashtable props = new java.util.Hashtable(1);*
*          props.put("domain", "true");*
*          props.put(javax.naming.Context.INITIAL_CONTEXT_FACTORY, "com.sap.engine.services.jndi.InitialContextFactoryImpl");*
                                                                                props.put(javax.naming.Context.PROVIDER_URL, "sapms://localhost:8110");
Can someone give me some light about how to send data to both nodes or how to do the data lookup into a specific node??
Thanks in advanced.
Emmanuel

Answer 1

Hi,
I guess what you are trying to achieve is to build a cache of ECC data in PI memory. In this case you have to maintain local cache of the data on each server node. Hopefully the amount of memory required will not impact the system stability.
Regarding the lookup of different server node, although it is technically possible, you need to bind a remote object in the JNDI and use costly remote communication to transfer the data between the server nodes.
I guess you also have to think of some kind of update / eviction strategy for your cache.
Hope this helps!
Best Regards,
Dimitar