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Subject: svn commit: r1455938 -
 /jackrabbit/oak/trunk/oak-mongomk/src/test/java/org/apache/jackrabbit/mongomk/prototype/MongoDbTest.java
Date: Wed, 13 Mar 2013 13:44:18 -0000
To: oak-commits@jackrabbit.apache.org
From: thomasm@apache.org
Message-Id: <20130313134418.7F3BB23889D7@eris.apache.org>

Author: thomasm
Date: Wed Mar 13 13:44:17 2013
New Revision: 1455938

URL: http://svn.apache.org/r1455938
Log:
OAK-619 Lock-free MongoMK implementation (MongoDB test case to support efficient diff if there are many child nodes)

Added:
    jackrabbit/oak/trunk/oak-mongomk/src/test/java/org/apache/jackrabbit/mongomk/prototype/MongoDbTest.java

Added: jackrabbit/oak/trunk/oak-mongomk/src/test/java/org/apache/jackrabbit/mongomk/prototype/MongoDbTest.java
URL: http://svn.apache.org/viewvc/jackrabbit/oak/trunk/oak-mongomk/src/test/java/org/apache/jackrabbit/mongomk/prototype/MongoDbTest.java?rev=1455938&view=auto
==============================================================================
--- jackrabbit/oak/trunk/oak-mongomk/src/test/java/org/apache/jackrabbit/mongomk/prototype/MongoDbTest.java (added)
+++ jackrabbit/oak/trunk/oak-mongomk/src/test/java/org/apache/jackrabbit/mongomk/prototype/MongoDbTest.java Wed Mar 13 13:44:17 2013
@@ -0,0 +1,115 @@
+/*
+ * 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.prototype;
+
+import org.apache.jackrabbit.mongomk.prototype.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);
+    }
+    
+}