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flume-ng-amqp-plugin

The flume-ng-amqp-plugin allows you to use an AMQP broker as a Flume Source.

Usage

The AMQP Event Source will take messages from an AMQP broker and create Flume events from the message. The body of the event will contain the bytes from the message. All properties of the message, including headers, will be transferred as headers in the flume event. A timestamp header will be added to the event based either on the message's timestamp, or the system time depending on the configuration. The routing key from the AMQP message will be added as a routingKey header to the event. In addition a sourceId header will be added to the event that will contain an integer representing which instance of the source this is within an agent.

This source supports batching of events before sending into a channel.

The only required configuration parameter is either the exchangeName or the queueName parameter. All others will be defaulted.

  • exchangeName - required if queueName is not specified - this is the name of the AMQP exchange we are getting messages from.
  • queueName - required if exchangeName is not specified if left unspecified, the server chooses a name and provides this to the client. Generally, when applications share a message queue they agree on a message queue name beforehand, and when an application needs a message queue for its own purposes, it lets the server provide a name.
  • host - the host name or IP address of the broker. Defaults to localhost when not specified.
  • port - the port on which the broker is accepting connections. Defaults to 5672 when not specified.
  • virtualHost - the virtual host to use when connecting to the broker. Default to "/" when not specified.
  • userName - the AMQP user name to use when connecting to the broker. Defaults to "guest" when not specified.
  • password - the password to use when connecting to the broker. Defaults to "guest" when not specified.
  • connectionTimeout - connection establishment timeout in milliseconds; zero for infinite. Defaults to zero.
  • requestedHeartbeat - the initially requested heartbeat interval, in seconds; zero for none. Defaults to zero.
  • exchangeType - the type exchange. Valid types are direct, fanout, topic, and header. Defaults to direct when not specified.
  • durableExchange - true if we are declaring a durable exchange (the exchange will survive a server restart). Defaults to false.
  • durableQueue - if true, the message queue remains present and active when the server restarts. It may lose transient messages if the server restarts. Defaults to false.
  • exclusiveQueue - if true, the queue belongs to the current connection only, and is deleted when the connection closes. Defaults to false.
  • autoDeleteQueue - true if we are declaring an autodelete queue (server will delete it when no longer in use). Defaults to false.
  • autoAck - i this field is set the server does not expect acknowledgements for messages. That is, when a message is delivered to the client the server assumes the delivery will succeed and immediately dequeues it. This functionality may increase performance but at the cost of reliability. Messages can get lost if a client dies before they are delivered to the application. Defaults to false.
  • prefetchSize - the client can request that messages be sent in advance so that when the client finishes processing a message, the following message is already held locally, rather than needing to be sent down the channel. Prefetching gives a performance improvement. The server will send a message in advance if it is equal to or smaller in size than the available prefetch size (and also falls into other prefetch limits). May be set to zero, meaning "no specific limit", although other prefetch limits may still apply. The prefetch-size is ignored if the no-ack option is set. Defaults to zero.
  • batchSize - This property has dual purposes. If the source is not in auto-ack mode, then this will be the number of messages to buffer before sending an ack to the server. Regardless of the ack mode, this property controls the number of events that are transferred to a Flume channel at a time. Defaults to 100.
  • bindings - comma separated list of strings that will be used to bind the queue to the exchange. This is not required for certain exchange types.
  • useMessageTimestamp - if true, the timestamp for the Flume event will be based on the timestamp from the AMQP message. Otherwise the system clock will be used. Defaults to false.

Examples

  1. Broker is on same node as flume agent, direct exchange type and two bindings

    agent1.sources.amqpSource.type = org.apache.flume.amqp.AmqpSource
agent1.sources.amqpSource.exchangeName = alertMessages
agent1.sources.amqpSource.bindings = system application

  2. Broker is on different machine, direct exchange type, named queue

    agent1.sources.amqpSource.type = org.apache.flume.amqp.AmqpSource
agent1.sources.amqpSource.host =  10.23.224.25
agent1.sources.amqpSource.exchangeName = stockTrades
agent1.sources.amqpSource.bindings  = GOOG APPL TSLA
agent1.sources.amqpSource.queueName  = stockQueue

  3. Also works if only queue name is specified (all queues are bound by default to the amq.direct exchange with the queue name)

    agent1.sources.amqpSource.type = org.apache.flume.amqp.AmqpSource
agent1.sources.amqpSource.host =  10.23.224.25
agent1.sources.amqpSource.queueName  = stockQueue

Building

The AMQP Source is built using maven. Execute the

mvn clean package

this will tar.gz that contains the compiled classes and all dependent libraries. Extract this tgz into the plugins.d directory in your Flume installation and restart the agent.