ELASTIC stage v1.1

Pipelines v2.1

Purpose, Operands, Streams, Usage, Examples, Related

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Syntax

 
>>──ELASTIC──────────────────────────────────────────────────────────────────────────><

Purpose

Use the ELASTIC stage to prevent a stall in a multi-stream pipeline.

ELASTIC reads records from its primary input stream and writes them to its primary output stream; putting at least as many input records as necessary into a buffer to prevent a pipeline stall. ELASTIC reads input records whenever they become available and writes output records as they are consumed, while attempting to minimise the number of records in the buffer.

Operands

None.

Streams

The following streams are used by the ELASTIC stage:

Stream	Action
Primary input stream	ELASTIC reads records from its primary input stream.
Primary output stream	ELASTIC writes the records it reads from its primary input stream to its primary output stream.

Usage

1.	ELASTIC delays the records that it writes to a buffer.
2.	If the ELASTIC stage discovers that its primary output stream is not connected, the ELASTIC stage ends.
3.	ELASTIC can replace any BUFFER stage that is used for the prevention of a pipeline stall. However, use the BUFFER stage when you know that the complete file must be put in a buffer (for example, when another branch of the pipeline contains a SORT stage).
4.	ELASTIC verifies that its secondary output stream is not connected and then begins execution.

Examples

1.	Sorting a range of records
2.	Arranging text in vertical columns
3.
4.

Related

BUFFER, FANIN, FANINANY

History

Version	Date	Action	Description	Pipelines
1.1	24.12.2021	changed	Application-wide rewrite.	2.1
1.0	06.09.2007	created	First version.	1.0