Used in: cluster-config.
Specifies configuration information for the Packet publisher, which manages network data transmission.
The Packet publisher is responsible for ensuring that transmitted packets reach the destination cluster node. The publisher maintains a set of packets which are waiting to be acknowledged, and if the ACK does not arrive by the packet-delivery resend timeout, the packet will be retransmitted. The recipient node will delay the ACK, in order to batch a series of ACKs into a single response.
The rate at which the publisher will accept and transmit packet may be controlled via the traffic-jam and packet-delivery/flow-control settings. Throttling may be necessary when dealing with slow networks, or small packet-buffers.
The following table describes the elements you can define within the packet-publisher element.
| Element | Required/Optional | Description |
|---|---|---|
| <enabled> | Required | Specifies if TCMP clustering is enabled. For Coherence editions which support both Coherence Extend and Coherence TCMP based clustering, this feature allows TCMP to be disabled to ensure that a node only connects via the Extend protocol.
Default value is true. Preconfigured override is tangosol.coherence.tcmp.enabled. |
| <packet-size> | Required | Specifies the UDP packet sizes to utilize. |
| <packet-delivery> | Required | Specifies timing parameters related to reliable packet delivery. |
| <notification-queueing> | Required | Contains the notification queue related configuration info. |
| <burst-mode> | Required | Specifies the maximum number of packets the publisher may transmit without pausing. |
| <traffic-jam> | Required | Specifies the maximum number of packets which can be enqueued on the publisher before client threads block. |
| <packet-buffer> | Required | Specifies how many outgoing packets the OS will be requested to buffer. |
| <packet-pool> | Required | Specifies how many outgoing packets Coherence will buffer before blocking. |
| <priority> | Required | Specifies a priority of the packet publisher execution thread.
Legal values are from 1 to 10. Default value is 6. |
The content override attribute xml-override can be optionally used to fully or partially override the contents of this element with XML document that is external to the base document.