92 lines
2.7 KiB
Markdown
92 lines
2.7 KiB
Markdown
# clj-druid
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[](https://travis-ci.org/y42/clj-druid)
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Clojure library for [Druid](http://druid.io/).
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clj-druid eases druid integration providing a client as well as a set of [Schema] (https://github.com/Prismatic/schema) to validate queries.
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Current version is up to date with latest query API from official docs.
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## Installing
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Add the following to your [Leiningen](http://github.com/technomancy/leiningen) `project.clj`:
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## Usage
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### Client
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Connect to a druid cluster through Zookeeper,
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this method supports auto detection and update of available brokers for easy HA/load balancing
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```clj
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(use 'clj-druid.client)
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(connect {:zk {:host "127.0.0.1:2181"
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:discovery-path "/druid/discovery"
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:node-type "broker"}})
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```
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you can also connect by supplying a vector of hosts, useful for dev, local testing
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```clj
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(use 'clj-druid.client)
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(connect {:hosts ["http://127.0.0.1:8083/druid/v2"]})
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```
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### Querying
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Issue druid queries supplying
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* a load balance strategy [fixed random]
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* a queryType
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* a query in the following form
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```clj
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(def q
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{:queryType :timeseries
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:dataSource "sample_datasource"
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:granularity :day
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:filter {
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:type :and
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:fields [
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{:type :selector :dimension "sample_dimension1" :value "sample_value1"}
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{:type :or
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:fields [
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{:type :selector :dimension "sample_dimension2" :value "sample_value2"}
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{:type :selector :dimension "sample_dimension3" :value "sample_value3"}]}]}
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:aggregations [
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{:type :longSum :name "sample_name1", :fieldName "sample_fieldName1"}
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{:type :doubleSum :name "sample_name2", :fieldName "sample_fieldName2"}]
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:postAggregations [
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{:type :arithmetic
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:name "sample_divide"
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:fn "/"
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:fields [{:type :fieldAccess :name "sample_name1" :fieldName "sample_fieldName1"}
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{:type :fieldAccess :name "sample_name2" :fieldName "sample_fieldName2"}]}]
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:intervals ["2012-01-01T00:00:00.000/2012-01-03T00:00:00.000"]})
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(let [client (connect {:zk {:host "127.0.0.1:2181"
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:discovery-path "/druid/discovery"
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:node-type "broker"}})]
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(query client random (:queryType q) q)
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(close client))
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```
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### Example
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An example using compojure-api to spawn a full druid API is located in the examples folder
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```bash
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git clone https://github.com/y42/clj-druid
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cd clj-druid/examples
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lein ring server
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```
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Have Fun!
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## License
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Copyright © 2015 Guillaume Buisson
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Distributed under the Eclipse Public License, the same as Clojure.
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