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Revisiting charts: NodeJS, Twitter and Elasticsearch

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Some time ago, I developed a mashup using NodeJS and Couchbase to demonstrate how to use Couchbase to create stats and charts. Despite I still use Couchbase for many things in my day-to-day basis, it does not provide any comfortable way to perform free text search, so I moved to ElasticSearch for some projects. In this series of  posts I show how to create a very basic NodeJS application that gets tweets from Twitter stream, stores them into ElasticSearch and get some charts about them. First thing first, you have to install ElasticSearch. If you are using a Mac and Homebrew, just brew the following formula: $ brew install elasticsearch And then, run ElasticSearch as you prefer. Example: $/usr/local/bin/elasticsearch -f -D es.config=/usr/local/opt/elasticsearch/config/elasticsearch.yml After a few seconds, you will get something like this on you terminal: [2014-01-13 20:55:08,290][INFO ][node ] [Rhiannon] {0.20.2}[36723]: initializing ... [2014-01-13 20:55:08,309][INFO ][plugins ] ...
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Emergency Recovery Script from Couchbase disaster

Today, I dealt with a totally broken installation of Couchbase 2.0.0 Developer Preview. I couldn't find why but, although views were returning the right results, when I tried to retrieve a single document, I was getting the error below: { "error": "badrpc", "reason": "{'EXIT',{{{badmatch,{error,closed}}, [{mc_client_binary,cmd_binary_vocal_recv,5}, {mc_client_binary,get_meta,3}, {ns_memcached,do_handle_call,3}, {gen_server,handle_msg,5}, {proc_lib,init_p_do_apply,3}]}, {gen_server,call, [{'ns_memcached-$data-default','ns...@127.0.0.1'}, {get_meta,<>,37}, 30000]}}}" } This is taken from Network Monitor panel on Chrome. On Coucbase admin console (:8091) the only message I got was "Unknown error". I tried to upgrade the couchbase version by downloading one of the latests builds, which is said to be more stable and have less problems that Developer Preview. But, this is what happened when I tried to instal...
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Basic Couchbase querying for SQL people

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This is the second of a series of posts about Couchbase. For the first one, click here . Probably, you all know how to query a relational database. It is done using SQL, a declarative (non-imperative) language that is widely used to insert and retrieve information from databases. Taking a users table A typical SQL query should look like this: SELECT u.id, u.username, u.first_name, u.last_name, u.last_login FROM users u WHERE u.id = “1111”; But... How do I create a query similar to the one above in Couchbase? Well. The answer is: Creating a view CREATING A VIEW Download and install Couchbase server on your computer, and go through the set-up process. Then, you’ll need to create some documents. You can download these sample documents and use them in the following examples. Once you have created your documents, go to the VIEWS tab. Once there, you’ll see something like this page. As you have probably never created a view on your system, your views list will be empty. Let’s start by creat...
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