Scaling CouchDB: Replication, Clustering, and Administration by Bradley Holt

By Bradley Holt

This sensible advisor deals a quick path on scaling CouchDB to fulfill the ability wishes of your dispensed software. via a chain of scenario-based examples, this e-book helps you to discover numerous equipment for making a process which could accommodate progress and meet anticipated call for. within the technique, you find out about numerous instruments that could assist you with replication, load balancing, clustering, and cargo checking out and tracking.

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Sample text

Pillow Pillow is both a router and rereducer for CouchDB. Like Lounge, Pillow is a separate application that sits in front of a cluster of standard CouchDB nodes. Both Lounge and Pillow are designed to solve the same problems, but they have different approaches to solving these problems. Pillow uses the hash of a document ID to determine which CouchDB node should serve the request. For view requests, Pillow collects the view results from all CouchDB nodes and merges these results for the client.

Ini file, but may be specified using the q query parameter when creating a database. The default value is 8. N The number of redundant replicas that should be created for each document (technically, the number of copies of each shard), on the same number of different nodes. The default value is 3. W The number needed for a write quorum. A client will not receive an indication of write success (201 Created) until this many nodes have successfully written the document. W must be less than or equal to N.

These two variables will contain the ID and revision of the created document (once the response has been received). The http element initiates an HTTP request. , GET, POST, PUT, DELETE). The url attribute specifies the URL to which to make the request. This can be relative to the host set up earlier in the servers element, or a full URL. The content_type attribute specifies the value of the Content-Type HTTP header. The contents attribute specifies the contents of a POST or PUT request body. Here we are using a JSON object as the request body.

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