arango db driver 3.1.x & Replication

[aznwarmonkey]

This is perhaps not an issue but me not knowing the API well as I am new to ArangoDB. Using the driver version 3.1.x I noticed there isn't a way to configure the number of shards & replication when using the ArangoDriver.createGraph API.

Instead I have to use the ArangoDriver,createCollection and specify the CollectionOptions with the number of shards. I would expect the replication factor to be available in this class but it is not. Is there a way to change the replication factor using the java API? If so, where is it located?

Currently setup is a 3 node cluster using the lateset version of ArangoDB each node running agency, primaryDB and coordinator.

[mvollmary]

At the current state of development there is no possibility of setting the number of shards or the replication factor by creating a graph. The driver talks with the http API of the server and it does not support it at the moment. You did right by creating the collections before creating the graph.

The missing replication factor in the options of createCollection is a bug. I will add it and release a bugfix-release within the next days.

Best,
Mark

[mvollmary]

The bug-fix release 4.1.1 and 3.1.3 is out.

[aznwarmonkey]

I just tired to use the new replication factor. Here's a snippet of code i am using to create a collection

/**
 * @param pCollection The collection to CREATE
 * @param pEdge true of this is an edge collection
 * @param pDriver the {@link ArangoDriver}
 */
private static void createCollection(final String pCollection, final boolean pEdge, final ArangoDriver pDriver) {
    try {

        final CollectionOptions collectionOptions = new CollectionOptions();
        collectionOptions.setNumberOfShards(8);
        collectionOptions.setReplicationFactor(3);
        if (pEdge) {
            collectionOptions.setType(CollectionType.EDGE);
        } else {
            collectionOptions.setType(CollectionType.DOCUMENT);
        }
        collectionOptions.setWaitForSync(true);
        pDriver.createCollection(pCollection, collectionOptions);

    } catch (final ArangoException exception) {
        exception.printStackTrace();
    }
}

From the web UI, under the collection information, the replication factor is still set to 1. Is there something I am missing?

The current version of Arango cluster I am running is 3.0.10. I originally thought it was 3.1 but was mistaken. Could this be the issue?

[aznwarmonkey]

I dug deeper into the source code and found that In the class InternalCollectionDriverImpl.createCollection(String database, String name, CollectionOptions collectionOptions) the replication factor is set in CollectionOptions but is never called for the HTTP request

[mvollmary]

Yes. I found it too. I must have overlooked it. I fix it and release a new version (3.1.4).

Apart from this you should think about updating your ArangoDB to 3.1. The Java driver in version 3.1.x is not 100% compatible with ArangoDB 3.0.