/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.jackrabbit.mongomk;
import org.apache.jackrabbit.mongomk.DocumentStore.Collection;
import org.junit.Ignore;
import org.junit.Test;
import com.mongodb.BasicDBObject;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.DBCursor;
import com.mongodb.DBObject;
import com.mongodb.QueryBuilder;
import com.mongodb.WriteConcern;
/**
* Test directly ran against MongoDB.
*/
public class MongoDbTest {
@Test
@Ignore
public void manyChildNodes() {
DB db = MongoUtils.getConnection().getDB();
MongoUtils.dropCollections(db);
DBCollection nodes = db.getCollection(Collection.NODES.toString());
DBObject index = new BasicDBObject();
// modification time (descending)
index.put("_mod", -1L);
// and then id (ascending)
index.put("_id", 1L);
DBObject options = new BasicDBObject();
// options.put("unique", Boolean.TRUE);
nodes.ensureIndex(index, options);
// index on (_id, _mod):
// Query plan: { "cursor" : "BtreeCursor _id_1__mod_-1" ,
// "isMultiKey" : false , "n" : 2000 , "nscannedObjects" : 2000 ,
// "nscanned" : 954647 , "nscannedObjectsAllPlans" : 1907080 ,
// "nscannedAllPlans" : 2859727 , "scanAndOrder" : false ,
// "indexOnly" : true , "nYields" : 5 , "nChunkSkips" : 0 ,
// "millis" : 5112 ,...
// Time: 2229 ms
// Count: 2000
// index on (_mod, _id)
// Query plan: { "cursor" : "BtreeCursor _mod_-1__id_1" ,
// "isMultiKey" : false , "n" : 2000 , "nscannedObjects" : 2000 ,
// "nscanned" : 2000 , "nscannedObjectsAllPlans" : 2203 ,
// "nscannedAllPlans" : 2203 , "scanAndOrder" : false ,
// "indexOnly" : true , "nYields" : 0 , "nChunkSkips" : 0 ,
// "millis" : 3 ,...
// Time: 43 ms
// Count: 2000
int children = 1000000;
int perInsert = 1000;
int group = 0;
String parent = "/parent/node/abc";
for (int i = 0; i < children;) {
DBObject[] inserts = new DBObject[perInsert];
group++;
for (int j = 0; j < perInsert; j++, i++) {
BasicDBObject doc = new BasicDBObject();
inserts[j] = doc;
doc.put("_id", parent + "/node" + i);
doc.put("_mod", group);
}
nodes.insert(inserts, WriteConcern.SAFE);
log("inserted " + i + "/" + children);
}
QueryBuilder queryBuilder = QueryBuilder.start("_mod");
queryBuilder.greaterThanEquals(group - 1);
queryBuilder.and("_id").greaterThan(parent + "/");
queryBuilder.and("_id").lessThanEquals(parent + "0");
DBObject query = queryBuilder.get();
BasicDBObject keys = new BasicDBObject();
keys.put("_id", 1);
DBCursor cursor = nodes.find(query, keys);
int count = 0;
log("Query plan: " + cursor.explain());
long time = System.currentTimeMillis();
while (cursor.hasNext()) {
DBObject obj = cursor.next();
// dummy read operation (to ensure we did get the data)
obj.get("_id");
count++;
// log(" read " + obj);
}
time = System.currentTimeMillis() - time;
log("Time: " + time + " ms");
log("Count: " + count);
db.getMongo().close();
}
private static void log(String msg) {
System.out.println(msg);
}
}