mongodb-user@googlegroups.com discussions for August 2013

19	[mongodb-user] MongoDB and Apache Tomcat for a Webapp

Hello, i will build a webapplication with MongoDB and Apache Tomcat. I searched in the group and for the internet, but i don't find a solution to build a webapplication with mongoDB and Apache ...

Theone2k5
Aug 30, 2013 at 6:25 pm
Sep 16, 2013 at 10:13 am

14	[mongodb-user] MongoCollection.Save lead to CPU freeze

I spool incoming file into a queue which a then insert or update one items a a time. After a while or suddenly, process freeze with 100% CPU. The same file is successfully imported into GridFs when ...

Mongy
Aug 1, 2013 at 2:59 pm
Sep 10, 2013 at 3:55 pm

13	[mongodb-user] Bson to json decoding in python

Hi, I have bson formatted data saved in file. Now I want to convert that data to json? So I tried this s = '\x16\x00\x00\x00\x02hello\x00\x06\x00\x00\x00world\x00\x00'bson_obj = ...

Mohit Singh
Aug 28, 2013 at 8:32 pm
Aug 28, 2013 at 10:51 pm

13	[mongodb-user] Python + MongoDB - Cursor iteration too slow ?

I have a database find query which returns 150k documents where each document contains three integer fields and one datetime field. The following code attempts to create a list from the cursor ...

Rob B
Aug 22, 2013 at 3:58 pm
Aug 22, 2013 at 8:00 pm

11	[mongodb-user] Reduce Sockettimeout errors without compromising latency

Hello Everyone, My app serves approx. 4000 requests per second. We are using mongodb for storage requirements, and reads are heavy when compared to writes. I've configured the socket timeout and ...

Manikandan R
Aug 8, 2013 at 3:32 pm
Aug 20, 2013 at 11:14 am

10	[mongodb-user] Is there a MongoDB client side use case?

I'm just looking through the "MongoDB Applied Design Patterns" book by Rick Copeland for a use case close to mine. After scanning the book I'm still left wondering how to use MongoDB in a client side ...

Zoom
Aug 28, 2013 at 6:50 am
Sep 1, 2013 at 7:17 am

10	[mongodb-user] Only update a field if $addToSet is successful

Is there anyway to update a field only if an $addToSet succeeds? I only want e_dt to be updated if the record is actually modified. e.g. enableIntegration: function (siteId, integrationId) { return ...

Tim Shnaider
Aug 23, 2013 at 3:02 pm
Aug 25, 2013 at 7:35 pm

10	[mongodb-user] Tick Data Aggregation Example - OHLC

I have a collection containing tick data for a stock. Each document consists of a timestamp (datetime object), a price (integer), and a quantity (integer). I'm trying to implement the aggregation ...

Rob
Aug 22, 2013 at 4:42 pm
Aug 23, 2013 at 9:23 pm

10	[mongodb-user] Sharding for queries with id prefix

If a query is a prefix match on a string field (and that field is the shard key), will mongos figure out that it can do a targetted query, or will it do a broadcast? For example, if my _id's look ...

Glenn Maynard
Aug 9, 2013 at 3:22 pm
Aug 15, 2013 at 2:52 pm

10	[mongodb-user] the problem about move chunk

hello. I have manual move the chunks, but appear this error info: { "ok" : 0, "errmsg" : "that chunk is already on that shard" } I have check this chunk: *mongos ...

彪杨
Aug 7, 2013 at 11:55 pm
Aug 11, 2013 at 11:12 am

10	[mongodb-user] Mongodb 2.0.5 sharding no longer balanced

I started to see a problem a few days ago where the data going into mongo no longer spreads across the cluster. Everything except a very small amount of data is going to the database's primary shard ...

Chris Schmidt
Aug 8, 2013 at 3:35 pm
Aug 9, 2013 at 11:53 pm

8	[mongodb-user] mongodb-hadoop connector: hive MongoStorageHandler class not found

Hi, I am trying to create a hive table STORED BY "com.mongodb.hadoop.hive.MongoStorageHandler" using reference http://www.10gen.com/presentations/webinar-whats-new-mongodb-hadoop-integration (slide# ...

Rishav Rohit
Aug 27, 2013 at 7:39 am
Nov 18, 2013 at 12:02 pm

8	[mongodb-user] Are plenty redundant write operations normal in the oplog?

We've found in our oplog.rs collection plenty of redundant write operations per entry. Here is an example of one oplog document, thus, 1 operation which contains the SAME $set und $unset operation ...

Shi Shei
Aug 1, 2013 at 11:03 am
Sep 19, 2013 at 9:31 am

7	[mongodb-user] Questions about java driver connection pool

Hi, I have some questions about connection pool. for example, we have a replication set with 1 master, 4 slaves. we set the connectionsPerHost to 36. we set secondaryPreferred. Q1: how many ...

Andy.Fan
Aug 29, 2013 at 12:27 am
Jul 16, 2014 at 8:57 am

7	[mongodb-user] count() reports higher numbers than actual number documents in find-all cursor

Hi, I'm running a sharded, replicated mongo cluster with a single sharded collection which was migrated from a relational database table containing 155 million rows. For some reason, MongoDB reports ...

Avishay Lavie
Aug 29, 2013 at 8:20 am
Sep 2, 2013 at 8:14 am

7	[mongodb-user] Mongo using all memory

Hi, I'm running mongodb on a virtual machine and it's using all host memory. Is this normal? -- -- You received this message because you are subscribed to the Google Groups "mongodb-user" group. To ...

Fernando Cappi
Aug 24, 2013 at 11:55 pm
Aug 25, 2013 at 10:06 am

7	[mongodb-user] performance improvement with mongodb

i have a huge database and i need to compare 1 million data against 30million ... my script takes 3-4 minutes to fetch the result ... what all can be done to speed up comparison and retreieve results ...

Divine Prad
Aug 21, 2013 at 11:23 am
Aug 24, 2013 at 5:47 am

7	[mongodb-user] Slow JAVA DBCursor

I am currently evaluating MongoDB and using the mongo-java-driver-2.9.3.jar file running against the Mongo DB version 2.4.5. I have a collection of about a million documents. When I run the query ...

Tom
Aug 19, 2013 at 4:31 pm
Aug 21, 2013 at 2:36 pm

7	[mongodb-user] Collection sharded according to some commands, not sharded according to others

Hello, I'm trying to vet my backup & restore process. I dumped a whole sharded cluster using mongodump. I dropped collections from two databases, and then dropped the databases. I tried restoring the ...

Stu
Aug 13, 2013 at 10:28 pm
Aug 14, 2013 at 6:01 pm

7	[mongodb-user] Backing up EBS RAID volume

I have three servers running on amazon aws. each host contains a config server, a mongos instance and a mongod which is part of replica set. All of them save data and logs to ebs RAID disc mounted on ...

Kishore kumar
Aug 5, 2013 at 3:18 pm
Aug 12, 2013 at 9:05 am

6	[mongodb-user] High load on "old" shards after adding a new one

Hello, After I have added a new shard to my cluster I noticed a very strange behaviour: Without any operations on the database, the load on the "old" shards is very high and almost no data is being ...

Jacek Radzikowski
Aug 29, 2013 at 6:07 pm
Sep 6, 2013 at 3:37 pm

6	[mongodb-user] MongoDB Archive based Sharding

Hi, I want to know is there any way to do archive based sharding, below is my scenario:- Sharding key would be on timestamp, like between some period of time write will happen on one shard and after ...

Sawan Talreja
Aug 5, 2013 at 2:57 pm
Aug 27, 2013 at 7:25 am

6	[mongodb-user] Django MongoDB Project d to Synchronize DB with error TypeError("fields must be an instance of list")

Hi, All, I installed the following: django-nonrel-1.3 django_mongodb_engine-0.4.0-py2.7.egg django_autoload-0.01-py2.7.egg djangoappengine-1.4.0-py2.7.egg djangotoolbox-0.9.2-py2.7.egg ...

YuWan Liu
Aug 21, 2013 at 10:31 pm
Aug 22, 2013 at 11:18 pm

6	[mongodb-user] Logs on mongods and mongos (config - servers)

Hi there, Been trawling the numerous topics on this, and can't seem to find a definitive answer. Running 2.2.4, on Ubuntu, with 2 shards of 3 replica sets each, and 3 config servers. Have set ...

Peter Colclough
Aug 20, 2013 at 1:09 pm
Aug 21, 2013 at 9:33 pm

6	[mongodb-user] How to prevent locking while reading

I have a system in which there is constantly insertion is occurring and its working fine. But the problem is when i tries to read data, it waits till the write lock is uplifted and this happens very ...

Hamza Asad
Aug 2, 2013 at 11:05 am
Aug 21, 2013 at 8:09 am

6	[mongodb-user] Best schema

Hello Everyone, What is the best schema ? Is there a recommended strategy or criteria ? Option 1: *user {* * _id: ObjectId('asda1233eqww'),* * name: 'adsads',* * email: '[email protected]'* * gallery: [* * ...

Leonardo S
Aug 11, 2013 at 10:01 pm
Aug 13, 2013 at 3:09 pm

5	[mongodb-user] Issue with Sharded cluster

Hello, We experienced a problem on our Mongo Sharded Cluster. One of the 3 ConfigServs failed recently. The server came back online few hours later. On the mongoS logfile we could observe : Thu Aug ...

Anthony
Aug 29, 2013 at 11:30 am
Sep 2, 2013 at 8:25 am

5	[mongodb-user] Adding/Removing Replica Set Members Causes AutoReconnect Errors

Hi all, I'm running a mongo replica set on EC2. Every time I either add or remove a secondary node from the replica set, I get flooded with AutoReconnect('No primary available',) errors. This leads ...

Calvin
Aug 16, 2013 at 6:27 pm
Aug 26, 2013 at 10:59 pm

5	[mongodb-user] How to get Pymongo to aggregate to get distinct values?

Hello: I have a collection colname with fieldname1 and fieldname2. It's in a sharded collection. I'm using Pymongo. Apparently, to get distinct values of (fieldname1, fieldname2), I need to use ...

Kevin Rice
Aug 23, 2013 at 10:41 pm
Aug 26, 2013 at 8:06 pm

5	[mongodb-user] How many indexes do i need to create on the same collection to to suit this context

I am in the process of creating *Indexes* for my Application which may have a concurrent users of *1000* at a time . *We are using MongoDB for our Application .* I have got a question with respect to ...

Kiran Kumar
Aug 26, 2013 at 12:43 pm
Aug 26, 2013 at 5:24 pm

5	[mongodb-user] A question about lock.

Dear ALL I`m a freshman of mongodb. Recently i heard about some argument about mongo`s lock. Then we did a pressure test of our mongo server ,which has two sharding. The result is ...

Zhouliyang12
Aug 23, 2013 at 2:55 am
Aug 23, 2013 at 9:52 am

5	[mongodb-user] queues and rs.stepdown()

Hi All, I am curious as to the process to rs.stepdown. I am a bit of a noob with Mongo and currently taking the mongodba course from 10gen to learn more. I would like to know what happens to the ...

Hamza Fareed
Aug 20, 2013 at 1:09 pm
Aug 22, 2013 at 2:52 pm

5	[mongodb-user] hang when calling motor.Op with MotorCollection.insert

Hi, I started to use tornado and motor, however, I just got stock in this hanging issue. Here is my sample code for this issue: import tornado.testing import motor import unittest class ...

Mission liao
Aug 20, 2013 at 4:33 pm
Aug 21, 2013 at 3:20 am

5	[mongodb-user] Changing the type of all of the items in a nested array

I have a bunch of documents in Mongo like so: { "_id": ObjectId("517acff07a986d29b0e8285b"), "Access": [ [ObjectId("517ee23c7a986d223cef7742"), [0]], [ObjectId("517f993d7a986d223c5e5a4e"), [0]], ...

James Crosswell
Aug 19, 2013 at 10:04 pm
Aug 20, 2013 at 9:10 pm

5	[mongodb-user] Need help with Group Query

I am using a group query because I want to get distinct combinations of the group like A, B, C. And I am supposed to do that on a dataset of around 10 million. Doing a group takes a lot of time. Has ...

Kunal mittal
Aug 15, 2013 at 2:04 pm
Aug 16, 2013 at 5:20 pm

5	[mongodb-user] find out which node was primary yesterday

I am trying to figure out which mongo node was primary at a specific point of time yesterday. Is it possible? The reason I wish to do that is because we had a very strange situation yesterday - our ...

Gunners
Aug 14, 2013 at 9:18 pm
Aug 15, 2013 at 12:03 am

5	[mongodb-user] Mongodb or not? Another scenario

Hi, I've been asked to build a push notification system for my employer. The idea is mobile clients will register to receive notifications (apple and android). Here's what I know so far: 1. expect ...

Rakesh
Aug 13, 2013 at 12:23 pm
Aug 14, 2013 at 10:28 am

5	[mongodb-user] To Mongodb or not?

Hey, I've got the following scenario, and I'm unsure if I should mongodb or a relational db (mongoid or active record in rails): Objects: App, Role, Permission Use Case: User creates App, adds ...

Sol
Aug 12, 2013 at 10:01 pm
Aug 13, 2013 at 11:17 am

5	[mongodb-user] Mongodump with auth doesn't work

Hi guys I'm testing a mongodump backup and it just doesnt work. I'm using this URL mongodump --host localhost --port 27017 --username admin --password admin --db testcustom --out mongodump That's the ...

Djonatan Buss
Aug 3, 2013 at 1:06 am
Aug 13, 2013 at 1:50 am

5	[mongodb-user] Secondary node can not join replica set after half hour replication lag

We have 2 shards cluster setup in mongodb 2.4.5 version on ubuntu 12.4. Each shard consist of three replica set members (one primary,one secondary and one arbiter). When we shutdown secondary node ...

Xiangjun
Aug 8, 2013 at 12:11 pm
Aug 9, 2013 at 5:14 am

5	[mongodb-user] Disable _secondaryThrottle in 2.4.5 for auto shard balancing

Hello, We want to speed up chunk migration in initial setup. Is there a way to set _secondaryThrottle to false during auto balancing to speed up chunk migration speed? Thank you. -- -- You received ...

Xiangjun
Aug 7, 2013 at 4:16 pm
Aug 8, 2013 at 6:44 pm

5	[mongodb-user] Threaded Inserting and MongoDB Connection Pool

Hello, I have an application written in C# which uses a ThreadPool in order to insert into MongoDB. However, recently I've been getting TimeoutException: Timeout waiting for a MongoConnection. My ...

Claudio Wilson
Aug 5, 2013 at 10:10 pm
Aug 8, 2013 at 9:33 am

5	[mongodb-user] Yet another thread on disk full - but I really want to use mongodb :)

Hello All, Ok, I'm looking at transitioning from an exiting large key-value store to mongodb... So I'm testing out various cases. The only show stopper really seems to be how mongodb handles full ...

Stu
Aug 1, 2013 at 8:44 pm
Aug 4, 2013 at 10:14 am

4	[mongodb-user] mongoimport

Hi Group, I already searched for "file too large" error. I am using: $ ./mongoimport -d edgeEvidence -c InWeb3 --file /home/unix/mercer/public_html/data/jsonEdgeEvidenceArray.json --jsonArray The ...

Johnathan Mercer
Aug 8, 2013 at 6:53 pm
Mar 31, 2014 at 3:05 am

4	[mongodb-user] How i can get MongoCursorEnumerator<T> in last version c# driver? (1.8.2)

Method *public virtual IEnumerator<TDocument GetEnumerator()* of class *MongoCursor* return next value: * return readOperation.Execute(new MongoCursorConnectionProvider(Server,readPreference )); * ...

Ogoun Er
Aug 15, 2013 at 1:04 pm
Jan 2, 2014 at 3:17 pm

4	[mongodb-user] The secondary always lag behind the primary

There are 3 servers in my replica set:one Primary,one Secondary and one Arbitor.Sometimes ,the secondary lags behind the primary.When this occured,i run the command {"closeAllDatabases"},sometimes,it ...

Lsl_322
Aug 26, 2013 at 1:47 pm
Sep 2, 2013 at 9:12 pm

4	[mongodb-user] How to make text search to work?

What could be happening if the text search always returns [] ? { "queryDebugString" : "t||||||", "language" : "english", "results" : [ ], "stats" : { "nscanned" : 0, "nscannedObjects" : 0, "n" : 0, ...

Gabriel Pugliese
Aug 29, 2013 at 5:14 pm
Aug 30, 2013 at 11:05 pm

4	[mongodb-user] errors in building mongodb source code using vs2010

hi, i am using version 2.2.0 of mongodb source code with scons v2.2.0 and python 32bit version 2.7.5. after downloading mongodb source code from github i am unable to compile it in vs2010 on my 64bit ...

12msitazahid
Aug 26, 2013 at 10:31 pm
Aug 29, 2013 at 8:12 pm

4	[mongodb-user] mongodump fails when running against a mongos

We have repeating problem with mongodump. Our database configuration: All DB hosts are EC2 instances with data files on EBS volumes. We use sharded configuration (3 shard servers + 3 config servers) ...

Vladimir Poluyaktov
Aug 15, 2013 at 7:51 pm
Aug 29, 2013 at 6:44 pm

4	[mongodb-user] Lots of "replSet replSetInitiate admin command received from client" messages in 2.4.4

I hope this is not a dumb question, I could not find a good answer. Here is what is happening: The primary for one of my shards is reporting this in the "_replSet" rest output: Tue Aug 27 ...

Julio Garcia Fc
Aug 27, 2013 at 5:25 pm
Aug 29, 2013 at 5:34 pm

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