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Mongodb: Waited too long for lock balancer to unlock

Mongo Version: 2.4.5 OS: Windows Server 2008 R2 Standard (Service Pack 1) We have a balancer idling for a day doing nothing (no recent records in changelog), holding a lock state 2. Tried to stop ...
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15 views

MongoDb Sharding between replica and standalone server

So i got a replica set with three servers and a standalone server . I have enabled sharding between them. I inserted more data on replica primary server using "rockmongo". But the chunks are not ...
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40 views

MongoDB Synchronizing multiple Shards

I've got the following layout Picture Cluster RZ West is my first data center A and RZ Ost my second data center B. As you can see one secondary database of each cluster is available in the other ...
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47 views

MongoDB Sharding and Replica Set Allocation

I am going to setup MongoDB cluster: 3 config servers, 3 routing servers, 2 shards (replica set per shard). A replica set is just simply 1 primary, 1 secondary and 1 arbiter. Therefore, in my ...
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31 views

Sharding Postgres Database

I have a Postgres database that has grown to the size where it is no longer feasible to store everything on a single database node. There is a Customer table in my schema where each row represents a ...
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29 views

Mongodb ubuntu - config server and shard together

I have the following services on a single shard server: sudo mongod --dbpath /data/db/ --port 31001 sudo mongod --configsvr --dbpath /data/configdb/ --port 21001 The same server is using for shard ...
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1answer
58 views

What inefficiency does sharding & partitioning attempt to address? [closed]

I have never implemented sharding or partitioning, but from what I understand, multiple servers are used to distribute large amounts of data. Is this because of a limited hardware budget or to ...
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1answer
47 views

Mongo db and sharding / replica sets concept questions

I have few questions about sharding and replica sets: I am planning to write important logs to a sharded environment. about 100 million rows in a day, If I will connect to a single MONGOS process , ...
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42 views

Data replication vs parallel shard query

I'm not a DBA, and I'm wondering how a SQL Server database can scale to fit the needs of a social network. I'm not interested in NOSQL, and I understand that caching plays an important role in ...
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46 views

Meta Database for a multi-tenant multi-shard environment

I’ve spent quite a bit of time researching sharding of a multi-tenant database (for a SAAS application). I wasn’t able to find much information on handling the Meta Database, containing connections ...
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1answer
59 views

Where to insert data after sharding?

Actual database in localhost:30000 ------------- I used this as Shard1 another mongod in localhost:30001 ------------- Shard2 another mongod in localhost:30002 ------------- Shard3 ...
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1answer
33 views

Shard key selection for both write scaling and query isolation?

From the mongod documentation, I know that when choosing shard keys the key should always have high cardinality, so write operations are distributed to different shards (a kind of write scaling). But ...
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1answer
125 views

verify that mongos server is connected to config servers

I've been writing a backup script for sharded replica-sets and it's almost done, except that I can't seem to get it to successfully start the balancer back up after everything's all said and done. ...
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19 views

how to start sharding in mongodb

I am trying to learn sharding in MongoDb and here is my plan: I'm trying to shard the database S001 into 2 different machines. 192.xx.xx.60>mongod -configsvr --dbpath S001 ..Now running in ...
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1answer
94 views

Shard keys must all be ascending?

I have a collection that I've been trying to shard, but I can't get it to shard with the index that I gave it. The collection in question uses a hashed index, which I created using: ...
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1answer
140 views

How to Determine Chunk Distribution (data and number of docs) in a Sharded MongoDB Cluster?

Having done all the right things - picked an appropriate shard key, scaled horizontally, distributed my data across several shards, I find I now have no real way to determine how well balanced the ...