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Druid Firehoses

Firehoses describe the data stream source. They are pluggable and thus the configuration schema can and will vary based on the type of the firehose.

Field	Type	Description	Required
type	String	Specifies the type of firehose. Each value will have its own configuration schema, firehoses packaged with Druid are described below.	yes

We describe the configuration of the Kafka firehose example, but there are other types available in Druid (see below).

consumerProps is a map of properties for the Kafka consumer. The JSON object is converted into a Properties object and passed along to the Kafka consumer.
feed is the feed that the Kafka consumer should read from.

Available Firehoses

There are several firehoses readily available in Druid, some are meant for examples, others can be used directly in a production environment.

KafkaFirehose

This firehose acts as a Kafka consumer and ingests data from Kafka.

StaticS3Firehose

This firehose ingests events from a predefined list of S3 objects.

StaticAzureBlobStoreFirehose

This firehose ingests events, similar to the StaticS3Firehose, but from an Azure Blob Store.

Data is newline delimited, with one JSON object per line and parsed as per the InputRowParser configuration.

The storage account is shared with the one used for Azure deep storage functionality, but blobs can be in a different container.

As with the S3 blobstore, it is assumed to be gzipped if the extension ends in .gz

Sample spec:

"firehose" : {
    "type" : "static-azure-blobstore",
    "blobs": [
        {
          "container": "container",
          "path": "/path/to/your/file.json"
        },
        {
          "container": "anothercontainer",
          "path": "/another/path.json"
        }
    ]
}

TwitterSpritzerFirehose

See Examples. This firehose connects directly to the twitter spritzer data stream.

RandomFirehose

See Examples. This firehose creates a stream of random numbers.

RabbitMqFirehose

This firehose ingests events from a define rabbit-mq queue.
Note: Add amqp-client-3.2.1.jar to lib directory of druid to use this firehose.
A sample spec for rabbitmq firehose:

"firehose" : {
     "type" : "rabbitmq",
     "connection" : {
       "host": "localhost",
       "port": "5672",
       "username": "test-dude",
       "password": "test-word",
       "virtualHost": "test-vhost",
       "uri": "amqp://mqserver:1234/vhost",
     },
     "config" : {
       "exchange": "test-exchange",
       "queue" : "druidtest",
       "routingKey": "#",
       "durable": "true",
       "exclusive": "false",
       "autoDelete": "false",

       "maxRetries": "10",
       "retryIntervalSeconds": "1",
       "maxDurationSeconds": "300" 
     },
     "parser" : {
       "timestampSpec" : { "column" : "utcdt", "format" : "iso" },
       "data" : { "format" : "json" },
       "dimensionExclusions" : ["wp"]
     }
   }

|property|description|Default|required?| |--------|-----------|---------| |host|The hostname of the RabbitMQ broker to connect to|localhost|no| |port|The port number to connect to on the RabbitMQ broker|5672|no| |username|The username to use to connect to RabbitMQ|guest|no| |password|The password to use to connect to RabbitMQ|guest|no| |virtualHost|The virtual host to connect to|/|no| |uri|The URI string to use to connect to RabbitMQ| |no| |exchange|The exchange to connect to| |yes| |queue|The queue to connect to or create| |yes| |routingKey|The routing key to use to bind the queue to the exchange| |yes| |durable|Whether the queue should be durable|false|no| |exclusive|Whether the queue should be exclusive|false|no| |autoDelete|Whether the queue should auto-delete on disconnect|false|no| |maxRetries|The max number of reconnection retry attempts| |yes| |retryIntervalSeconds|The reconnection interval| |yes| |maxDurationSeconds|The max duration of trying to reconnect| |yes|

LocalFirehose

This Firehose can be used to read the data from files on local disk. It can be used for POCs to ingest data on disk. A sample local firehose spec is shown below:

{
    "type"    : "local",
    "filter"   : "*.csv",
    "baseDir"  : "/data/directory"
}

property	description	required?
type	This should be "local".	yes
filter	A wildcard filter for files. See here for more information.	yes
baseDir	directory to search recursively for files to be ingested.	yes

IngestSegmentFirehose

This Firehose can be used to read the data from existing druid segments. It can be used ingest existing druid segments using a new schema and change the name, dimensions, metrics, rollup, etc. of the segment. A sample ingest firehose spec is shown below -

{
    "type"    : "ingestSegment",
    "dataSource"   : "wikipedia",
    "interval" : "2013-01-01/2013-01-02"
}

property	description	required?
type	ingestSegment. Type of firehose	yes
dataSource	A String defining the data source to fetch rows from, very similar to a table in a relational database	yes
interval	A String representing ISO-8601 Interval. This defines the time range to fetch the data over.	yes
dimensions	The list of dimensions to select. If left empty, no dimensions are returned. If left null or not defined, all dimensions are returned.	no
metrics	The list of metrics to select. If left empty, no metrics are returned. If left null or not defined, all metrics are selected.	no
filter	See Filters	yes

CombiningFirehose

This firehose can be used to combine and merge data from a list of different firehoses. This can be used to merge data from more than one firehoses.

{
    "type"  :   "combining",
    "delegates" : [ { firehose1 }, { firehose2 }, ..... ]
}

property	description	required?
type	combining	yes
delegates	list of firehoses to combine data from	yes

EventReceiverFirehose

EventReceiverFirehoseFactory can be used to ingest events using an http endpoint.

{
  "type": "receiver",
  "serviceName": "eventReceiverServiceName",
  "bufferSize": 10000
}

When using this firehose, events can be sent by submitting a POST request to the http endpoint - http://<peonHost>:<port>/druid/worker/v1/chat/<eventReceiverServiceName>/push-events/

property	description	required?
type	receiver	yes
serviceName	name used to announce the event receiver service endpoint	yes
bufferSize	size of buffer used by firehose to store events	no default(100000)

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