[This is preliminary documentation and is subject to change.]
The MessageHeader type exposes the following members.
Fields
| Name | Description | |
|---|---|---|
 | ChannelID |
The ID of the logical dataflow edge on which the message is being sent.
|
| DestVertexID |
The ID of the destination vertex.
|
| FromVertexID |
The ID of the sending vertex.
|
| Length |
The number of bytes in the payload. Only messages with type Data
or CheckpointData have length greater than zero.
|
| SequenceNumber |
A sequence number for the connection between the sending and receiving process.
|
| Type |
The type of the message. Only messages with type Data
or CheckpointData have a payload.
|
See Also