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Explanation of System properties used in Qpid

This page documents the various System Properties that are currently used in the Qpid Java code base.

Client Properties

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The default with AMQP is to start prefetching messages. However, with certain 3rd party Java tools, such as Mule this can cause a problem. Mule will create a consumer but never consume from it so any any prefetched messages will be stuck until that session is closed. This property is used to re-instate the default AMQP behaviour. The default Qpid behaviour is to prevent prefetch occurring, by starting the connection Flow Controlled, until a request for a message is made on the consumer either via a receive() or setting a message listener.

qpid.sync_op_timeout

Type : long
Default: 60000
The length of time in millisecond to wait for a synchronous operation to complete. amqj.default_syncwrite_timeout is a synonym.

amq.dynamicsaslregistrar.properties

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Type : float
Default : 2.0
The factor used to get the timeout from the delay between heartbeats

amqj.

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tcp_nodelay

Type : boolean
Default : TRUE
Disable Nagle's algorithm on the TCP connection.

amqj.

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Type : integer
Default : 32768
This is the default buffer sized created by Mina.

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protocol.logging.level

Type : integerboolean
Default : 32768
This is the default buffer sized created by Mina.

amqj.protocolprovider.class

Type : String
Default : org.apache.qpid.server.protocol.AMQPFastProtocolHandler
This specifies the default IoHandlerAdapter that represents the InVM broker. The IoHandlerAdapter must have a constructor that takes a single Integer that represents the InVM port number.null
If set this will turn on protocol logging on the client

jboss.host

Used by the JBossConnectionFactoryInitialiser to specify the host to connect to perform JNDI lookups.

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Default : 30000
Used to set the maximum time the State Manager should wait before timing out a frame wait.

qpid.amqp.version

Default : 0-10
Used to restrict the client to a particular version of the AMQP Protocol. Client will begin negotiation at the specified version and only negotiate downwards if the broker does not support the specified version.

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