Re: Configuring Transaction Log feature


Sandeep Mishra <sandy...@...>
 

Pawan,
Can you elaborate more on the program where your are trying to embed the script in?
Regards,
Sandeep

On Sat, 28 Nov 2020, 13:48 Pawan Shriwas, <shriwa...@...> wrote:
Hey Jason,

Same thing happen with my as well where above script work well in gremlin console  but when we use it in java. we are not getting anything in process() section as callback. Could you help for the same.  


On Wednesday, 7 February 2018 at 20:28:41 UTC+5:30 Jason Plurad wrote:
It means that it will use the 'storage.backend' value as the storage. See the code in GraphDatabaseConfiguration.java. It looks like your only choice is 'default', and it seems like the option is there for the future possibility to use a different backend.

The code in the docs seemed to work ok, other than a minor change in the setStartTime() parameters. You can cut and paste this code into the Gremlin Console to use with the prepackaged distribution.

import java.util.concurrent.atomic.*;
import org.janusgraph.core.log.*;
import java.util.concurrent.*;

graph
= JanusGraphFactory.open('conf/janusgraph-cassandra-es.properties');

totalHumansAdded
= new AtomicInteger(0);
totalGodsAdded
= new AtomicInteger(0);
logProcessor
= JanusGraphFactory.openTransactionLog(graph);
logProcessor
.addLogProcessor("addedPerson").
        setProcessorIdentifier
("addedPersonCounter").
        setStartTime
(Instant.now()).
        addProcessor
(new ChangeProcessor() {
           
public void process(JanusGraphTransaction tx, TransactionId txId, ChangeState changeState) {
               
for (v in changeState.getVertices(Change.ADDED)) {
                   
if (v.label().equals("human")) totalHumansAdded.incrementAndGet();
                   
System.out.println("total humans = " + totalHumansAdded);
               
}
           
}
       
}).
        addProcessor
(new ChangeProcessor() {
           
public void process(JanusGraphTransaction tx, TransactionId txId, ChangeState changeState) {
               
for (v in changeState.getVertices(Change.ADDED)) {
                   
if (v.label().equals("god")) totalGodsAdded.incrementAndGet();
                   
System.out.println("total gods = " + totalGodsAdded);
               
}
           
}
       
}).
        build
()

tx
= graph.buildTransaction().logIdentifier("addedPerson").start();
u
= tx.addVertex(T.label, "human");
u
.property("name", "proteros");
u
.property("age", 36);
tx
.commit();

If you inspect the keyspace in Cassandra afterwards, you'll see that a separate table is created for "ulog_addedPerson".

Did you have some example code of what you are attempting?



On Wednesday, February 7, 2018 at 5:55:58 AM UTC-5, Sandeep Mishra wrote:
Hi Guys,

We are trying to used transaction log feature of Janusgraph, which is not working as expected.No callback is received at
public void process(JanusGraphTransaction janusGraphTransaction, TransactionId transactionId, ChangeState changeState) {

Janusgraph documentation says value for log.[X].backend is 'default'.
Not sure what exactly it means. does it mean HBase which is being used as backend for data.

Please let  me know, if anyone has configured it.

Thanks and Regards,
Sandeep Mishra

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