OpLogInfo in java Driver 3.2 vs 2.1

[majeed said]

Hi,

 i have the following concern :

 we had an application that used java driver 2.1 with the following code :

BasicDBObject object = (BasicDBObject) localDB.getCollection("system.namespaces").findOne(new BasicDBObject("name", "local.oplog.rs"));

LogFileSizeMB = ((BasicDBObject) object.get("options")).getDouble("size") / (1024 * 1024);

now after we moved to java driver 3.2 :

MongoCollection<org.bson.Document> collection = localDB.getCollection("oplog.rs");

MongoCursor<Document> cursor = collection.find().iterator();

the cursor always returning empty and we get the object as NULL.

can u please advise how can we change the implementation to get real data for setting OpLogInfo (log file size) ?

Regards,

Majeed Said

[Ross Lawley]

Hi,

It looks like a simple issue, you aren't querying the same collection in 3.2

localDB.getCollection("system.namespaces") !=  localDB.getCollection("oplog.rs")

If you update the 3.2 code to:

import static com.mongodb.client.model.Filters.eq;

MongoCollection<org.bson.Document> collection = localDB.getCollection("system.namespaces");

Document object = collection.find(eq("name", "local.oplog.rs")).first();

LogFileSizeMB = object.get("options", Document.class).getDouble("size") / (1024 * 1024);

It should be the same.

Ross

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