mongodb-user@googlegroups.com discussions for March 2012

34	[mongodb-user] aggregation performance

Hi, I am considering MongoDB as a possible solution for an application that will perform queries like "select count(*), sum(field) where ...". Because Mongo doesn't natively support sum() 3 ...

Pere Ferrera Bertran
Mar 28, 2012 at 2:40 pm
Jun 29, 2012 at 12:27 am

34	[mongodb-user] SlaveOk queries doesn't seems to go through mongoS

Hi guys, My Mongo cluster is setupped this way: - 2 mongos - 2 shards - 1 master/2 secondaries per shard I'm using the Java drivers and the C# drivers. With both drivers whenever I make a query when ...

Simon T.
Mar 19, 2012 at 8:36 pm
May 1, 2012 at 6:37 pm

32	[mongodb-user] Exception in thread "main" java.lang.IllegalArgumentException: 'ok' should never be null...

Hi, I run my map/reduce code using java driver and got this error message : Exception in thread "main" java.lang.IllegalArgumentException: 'ok' should never be null... What does this supposed to mean ...

Martinus Martinus
Mar 15, 2012 at 8:20 am
Apr 9, 2012 at 2:32 pm

25	[mongodb-user] Slow update as a key/value store

We are using MongoDb in a fairly extensive way and we noticed some strange slowness: Configuration: · MongoDB, Version 2.0.4, 64-bit, Linux, 3-nodes sharding cluster without replica nodes, each node ...

Dn
Mar 31, 2012 at 5:42 am
Apr 16, 2012 at 4:09 pm

23	[mongodb-user] Another map-reduce question

We are building a voting application and one of the use cases is to return the unique list of voters grouped by the artists who are voted on. Our data consists of a userVotes collection with around ...

Jonathan Hodges
Mar 20, 2012 at 7:53 pm
Mar 22, 2012 at 6:42 pm

21	[mongodb-user] Problems with Azure

We are running 2.01 on a cloud drive on Azure. We are running on a large VM - loads of memory and minimal activity. We are experiencing problems that appear to be connectivity related. Does anyone ...

Rusty
Mar 29, 2012 at 7:54 am
Jul 25, 2012 at 9:19 pm

19	[mongodb-user] Compressing data using embedded arrays ($set and $addToSet in the same update request)

Hi, I have documents in the following format: { "_id": ..., docId: "...", changes: [ {"n": "filehandle1", "by": "user1","t":1331201251}, {"n": "filehandle1", "by": "user1","t":1331218623}, {"n": ...

Awsiv
Mar 14, 2012 at 2:46 pm
Mar 16, 2012 at 11:16 am

18	[mongodb-user] exception: [test.collection] shard version not ok in Client::Context:

Hi, When I run my map reduce I got this error message from the log : exception: [test.collection] shard version not ok in Client::Context: your version is too old ns: test.collection global: 6|0 ...

Martinus Martinus
Mar 2, 2012 at 3:26 am
Apr 30, 2012 at 3:19 pm

18	[mongodb-user] mongos timeouting if 1 node is down

Hello Here is the case: 2 shards (2x2 replicas in each) 1a) mongo services get stopped on node A - system working OK 1b) os reinstalled on node A - system working OK 2) node A shutted down / rebooted ...

V
Mar 19, 2012 at 4:27 pm
Mar 27, 2012 at 2:56 pm

17	[mongodb-user] Problem in building mongoclient.lib in Windows 64 bit

Hi, I am trying to build mongoclient.lib (v2.0) in Windows 2003 Server 64 bit. I followed the steps mentioned in the following links, ...

Srinivasan T
Mar 12, 2012 at 1:34 pm
Mar 14, 2012 at 3:45 pm

17	[mongodb-user] Getting shard error from mongos: could not initialize cursor across all shards because : can't find shard for: og-mongo01:27017

Hi all, I'm getting these errors on the log from a mongos I'm trying to initialize: Wed Mar 7 09:52:44 [conn3] DBException in process: could not initialize cursor across all shards because : can't ...

Jorge Escobar
Mar 7, 2012 at 4:04 pm
Mar 8, 2012 at 11:16 pm

15	[mongodb-user] Shards not moving: "max number of requested split points reached" filling the logs

for the primary the logs are filing up with : max number of requested split points reached (2) before the end of chunk twitter_users.twitter_user_meta_data { : MinKey } -- { : MaxKey } and I mean ...

Dustin Norlander
Mar 7, 2012 at 1:14 am
Mar 12, 2012 at 4:24 am

15	[mongodb-user] Help: update array inside array : can't append to array using string field name [$]

Hi! I am trying to update my document from command line. This is my source: { "_id": "4f5475bbf598bef86290fe4f", "availableInSolutions": [ "VIEW" ], "clientId": "sviluppo1", "comments": [], ...

Emanuele Bragagnolo
Mar 5, 2012 at 10:45 am
Mar 6, 2012 at 8:59 am

14	[mongodb-user] mongo-hadoop and hadoop-0.23.1

I'm currently trying to get mongo-hadoop working with hadoop-0.23.1 and streaming. From the little documentation that exists on the web, I'm pretty certain that this is possible. After installing ...

Mark Lewandowski
Mar 9, 2012 at 8:41 pm
Aug 23, 2012 at 7:07 pm

14	[mongodb-user] drop sharded collection

Hi, I have my collection to be sharded and replicated. And one of my machine on the replica sets is dead, so when I tried to drop my sharded collection I got this error message : Thu Mar 22 08:42:30 ...

Martinus Martinus
Mar 22, 2012 at 8:46 am
Apr 5, 2012 at 2:41 pm

14	[mongodb-user] MapReduce question

Hello: We have a database like xxxx: xxxx, annot: {refgene: [xxxx, xxx], dbsnp: [xxx], cosmic: [xxx]...} We try to count the number of each member under annot, such as annot.refgene, annot.dbsnp, ...

Tiffany
Mar 23, 2012 at 12:47 am
Mar 29, 2012 at 7:23 am

14	[mongodb-user] getLastError blocks in the Java Driver on WriteConcern SAFE/FSYNC_SAFE

Hi, I've been running some unit tests on Mongo and after profiling them I have noticed that when using WriteConcerns different to NORMAL (at least for SAFE and FSYNC_SAFE) a lot of the CPU on is ...

Juan Cervera
Mar 13, 2012 at 1:36 pm
Mar 28, 2012 at 9:19 am

14	[mongodb-user] MongoDB ObjectID increment part doesn't increase contiguously.

As we know, MongoDB has 4 parts of ObjectID, time stamp,machine, pid and inc. I use PHP 5.3.5 with with MongoDB 1.6.3. When insert new document, I expect the last part(inc) of ObjectID increase ...

Nites Bootkhot
Mar 21, 2012 at 11:34 am
Mar 22, 2012 at 8:24 am

14	[mongodb-user] MMS Setup Issue

Hello. I'm having problems setting up MMS on one of my Mongo servers. The environment is CentOS 5.7, python 2.7.2, and I've installed pymongo. Here are the pertinent contents of the agent.log: ...

VJ
Mar 13, 2012 at 7:05 pm
Mar 15, 2012 at 7:56 pm

14	[mongodb-user] memory usage

I am trying to do some performance tuning on my shards and I noticed a lot of faults and high lock percentage using mongostat. I checked top and saw that mongod is only using around 30% of memory. ...

Patrick Scott
Mar 8, 2012 at 4:10 pm
Mar 9, 2012 at 3:16 pm

13	[mongodb-user] Very slow replica set performance when using java driver

Hello I set up simple replica set but I have issue when connecting to it using java driver. All mongo connections are veeery slow. It works fine when not using replica set or single node replicaset ...

Lkuczera
Mar 2, 2012 at 2:13 pm
Jul 2, 2013 at 7:54 pm

13	[mongodb-user] Creating index on array as key

Hi, I am creating index using index key as some array, in this case will it create a compound index with fields in array or will it be a simple index with just array. I am using mongo-c-driver call ...

Gaurav gangalwar
Mar 26, 2012 at 10:49 am
Mar 27, 2012 at 4:42 pm

13	[mongodb-user] date time sort problem

Hi, I am using pymongo to sort a set of collection and only return a subset of the results. The code looks like start = 1 rows = self.members.find()\ .sort(online, -1)\ .skip(start)\ .limit(24) Here ...

Mason
Mar 8, 2012 at 3:20 am
Mar 8, 2012 at 6:34 pm

13	[mongodb-user] Batch Insert Exceptions

I am doing batch insert and I often get the following exceptions by C# driver Safemode detected an error 'db assertion failure'. (response was { "assertion" : "didn't get writeback for: ...

mrCode
Mar 2, 2012 at 1:25 pm
Mar 4, 2012 at 4:20 am

12	[mongodb-user] Slow update of object with many attributes

I have a MongoDb instance with several collections. Virtual memory size of mongod process is about 40 Gb. There is 16 Gb of phisycal memory available. One of my services updates element with id = 0 ...

Eugene Bolotin
Mar 20, 2012 at 12:27 pm
Mar 21, 2012 at 1:34 pm

12	[mongodb-user] MONGODB Compile Error while using boost1.48

Hi，all When i was compiling mongodb 1.85 with boost1.4.8 (full install), It always report errors like that /usr/local/include/boost/thread/tss.hpp:84: undefined reference to ...

JohnHenry
Mar 8, 2012 at 12:29 pm
Mar 16, 2012 at 7:47 am

12	[mongodb-user] failed compact - collections with no indexes

I ran a compact command on a collection that failed when starting step 2/3 of building the index because it hit the maximum number of open files causing mongod to segfault. The collection itself ...

Zac Witte
Mar 2, 2012 at 8:05 am
Mar 8, 2012 at 5:18 pm

11	[mongodb-user] java + aggregation framework

Hi, Using the aggregation framework I finally got something working from mongo command line: db.weather_hourly.aggregate({ $match : { location : "KSFO"}}, { $group : { _id : "$location", avgTemp : { ...

Jason
Mar 23, 2012 at 9:17 pm
Mar 29, 2012 at 7:18 pm

11	[mongodb-user] Will newly inserted Doc stay in RAM assuming there are available unused free RAM

Will newly inserted Doc stay in RAM assuming there are available unused free RAM. Basically, my question is if App needs do a read-back after insertion to en sure that the newly added Doc stays in ...

Dhsieh
Mar 22, 2012 at 10:13 pm
Mar 22, 2012 at 11:58 pm

11	[mongodb-user] Streaming support

Hi I am trying to build the jar files for the streaming support. Here is what I am getting? Any ideas what this means ***Adding Pig Dependency for Version '0.9.1' *** Adding Hadoop Dependencies for ...

Elif
Mar 7, 2012 at 3:15 am
Mar 22, 2012 at 4:48 pm

11	[mongodb-user] does this make sense?

I just wanted to reach out to people smarter than me about mongo and about how mongo interacts with memory. I have a box that is using very low residential memory (about 500m out of 7.5g). However, ...

Patrick Scott
Mar 16, 2012 at 3:28 pm
Mar 21, 2012 at 3:30 pm

11	[mongodb-user] Running replication on Mongo DB issues

Hi All, I am new to mongo and am trying the code example given in the tutorail on Mongo site but am facing the issue below. According to the tutorial it should be fairly simple. But i am getting ...

Ad
Mar 13, 2012 at 1:36 pm
Mar 16, 2012 at 3:17 pm

11	[mongodb-user] Resync failed

I have got a 3 nodes replicaset (that is part of a cluster), i have resync the third node successfully, let it run for a few days, then i took down the first node in order to resync it, i found that ...

Erez Zarum
Mar 5, 2012 at 12:41 pm
Mar 8, 2012 at 12:10 am

11	[mongodb-user] connection slow with mongodb 2.0.2 + sharding + replica set + 6 VM environment

i have 1 64-bit server (192.168.7.132), this server have : Centos 5.6 64-bit 2 intel xeon 16 GB RAM 1 TB HDD i create 6 servers VM (using KVM) which each have : Centos 5.6 64-bit 1 core processor 2 ...

UltraLeftWing
Mar 5, 2012 at 7:59 am
Mar 6, 2012 at 7:37 am

10	[mongodb-user] Replica Set Member refuses to join set after restart

I have *MongoDB 2.0.1* Replica Set running on AWS. Two members are in one region and third member is in another. I restarted Mongo process running on this 3rd member and it's not joining the replSet ...

Abhishek Amberkar
Mar 16, 2012 at 6:00 pm
Mar 21, 2013 at 11:54 pm

10	[mongodb-user] [replicaset][mapreduce] Mapreduce output is written in primary node but not in secondary node

Hi everybody, I have a problem with my MongoDB infrastructure. I am trying to process a map reduce operation on a sharded & replicated collection, and write output on a non-sharded but replicated ...

Corentin Guy
Mar 20, 2012 at 4:33 pm
Apr 23, 2012 at 8:41 am

10	[mongodb-user] MongoDB 64-bit crashing PHP on saving to GridFS

Hey, I had raised a post about this on stack overflow (http:// stackoverflow.com/questions/9852028/mongodb-crashing-php-on-file- save-500-error-can-retrieve-file-saved-without-is) but thought I might ...

Dan
Mar 25, 2012 at 1:52 am
Apr 16, 2012 at 12:55 pm

10	[mongodb-user] Probems about pymongo install

Hi, all I want to write a simple python script, which used to import some initial data into mongo. So I need the pymongo package. I had downloaded the source code of pymongo according to the ...

JohnHenry
Mar 23, 2012 at 7:50 am
Mar 30, 2012 at 3:15 am

10	[mongodb-user] differences between primary and secondary

i just spent several hours bashing my head against odd behavior in my application. the cause turned out to be differences between primary and secondary in a mongo replication cluster. nothing odd has ...

Igor Serebryany
Mar 28, 2012 at 8:22 am
Mar 30, 2012 at 12:35 am

10	[mongodb-user] ReadStartDocument cannot be called when BsonType is: Array

monogdb The official driver public class CustomerInfo { private List<ContactInfo Tx_Contact = new List<ContactInfo (); private List<TransactionRecordInfo Tx_TransactionRecord = new ...

Chang
Mar 25, 2012 at 1:07 pm
Mar 26, 2012 at 4:07 am

10	[mongodb-user] query for linestring

How can I query for linestring in mongodb? -- You received this message because you are subscribed to the Google Groups "mongodb-user" group. To post to this group, send email to ...

Kara
Mar 6, 2012 at 8:21 pm
Mar 19, 2012 at 10:16 pm

10	[mongodb-user] how to convert field to lower case in script?

I am trying to create a lower case version of a field in all my documents. I tried toLower(), toLowerCase(), $toLower, etc.. but none work. I searched around and couldn't find any docs on how to do ...

Rl
Mar 18, 2012 at 1:29 am
Mar 18, 2012 at 3:28 am

10	[mongodb-user] Duplicate Mongo Records

Hi All, We've been using Mongo to store the results of some analytic types of calculations, and have noticed we occasionally get duplicate documents in Mongo. Basically we do the calculations in ...

Timfulmer
Mar 14, 2012 at 1:44 am
Mar 15, 2012 at 6:54 pm

10	[mongodb-user] MongoDB replication is very slow for removing records

we're using MongoDB replicaSet(5 nodes, 1+3+1 arbitor, we bulk inserting about 30 millions records a day, then but keep a few days records, we've to run clean up cron job overnight, but our operation ...

John liu
Mar 6, 2012 at 10:20 am
Mar 14, 2012 at 12:34 am

10	[mongodb-user] 2.0.3 performance

Hello! Is anyone experiencing performance issues under sharded enviroments after the upgrade to 2.0.3? We upgraded this way: 1. First upgraded mongod (secondaries first, then the primary) 2. Then the ...

Julman99
Mar 8, 2012 at 4:37 pm
Mar 9, 2012 at 8:29 pm

10	[mongodb-user] Approach to limits of atomic updates

Not having any way to do basic arithmetic operation like div, mulitply prior to version 2.2 and it's aggregation framework what's your approach of doing it ? -- You received this message because you ...

Krzysztof Rozacki
Mar 8, 2012 at 3:11 pm
Mar 8, 2012 at 6:27 pm

10	[mongodb-user] When I set chunksize to 500MB, it doesn't work

Hi, in my cluster, 1. I add first shard "set1 " to cluster. 2. I insert some large files, each file's size is 430MB. 3. I add the second shard "set2" to cluster. Then in the mongos's long ,I found: ...

Gen liu
Mar 5, 2012 at 9:40 am
Mar 7, 2012 at 2:06 am

9	[mongodb-user] results from $near sorted incorrectly

Hi, I use pymongo and passes the following spec crit = {'loc': SON([('$near', {'lat': 37.77493, 'lon': -122.41942}), ('$maxDistance', 7.246376811594203)]), 'birthday': {'$lte' ...

Mason
Mar 24, 2012 at 2:04 am
Apr 9, 2012 at 2:43 pm

9	[mongodb-user] How to get max/min value of an item in mongo collection?

Hi, all Is there any way in mongo to directly return max value of some field in an collection? I notice that mongo shell has such way, but I don't konw whether the development API support this ...

JohnHenry
Mar 21, 2012 at 8:49 am
Apr 7, 2012 at 1:53 pm

9	[mongodb-user] runCommand vs aggregate

Hi, If I use the aggregate operation, I'm able to get results: mongos db.weather_hourly.aggregate({ $match : { location : "KSFO"}}, { $group : { _id : "$location", avgTemp : { $avg : "$temperature" } ...

Jason
Mar 27, 2012 at 12:10 am
Apr 2, 2012 at 6:09 am

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