CODEWITHSUNDEEP
mongodbconcurrencylockingdatabase
ardunn
ardunn

Reputation: 99

How do I place a read lock on MongoDB?

My application needs to access a Mongo db where if more than one process/thread is reading from a specific collection, bad things will happen.

I need to restrict the ability of a group of processes to read from the collection (or db, if need be). So for example, if there are multiple processes trying to read from the db, they read sequentially, not in parallel.

Upvotes: 0

Views: 1282

Answers (1)

kozakvoj
kozakvoj

Reputation: 86

This could be done in the driver level. If you set connection pool size to 1 then all access to to database will be in sequence.

In nodejs you can set the driver as:

MongoClient.connect(url, {  
  poolSize: 1
});

From the documentation:

poolSize, this allows you to control how many tcp connections are opened in parallel. The default value for this is 5 but you can set it as high as you want. The driver will use a round-robin strategy to dispatch and read from the tcp connection.

Upvotes: 1

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