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Reference
Find details on the SPL language, toolkits, APIs, commands, and more.
Toolkits
A toolkit is a set of SPL artifacts, which are organized into a package. Toolkits make SPL or native functions and primitive or composite operators reusable across different applications.
Toolkits
Toolkit com.teracloud.streams.teda 4.0.0
Developing applications
Configuring Solutions
Configuring ITE Applications
Data ingestion
Distributing files to processing chains defined on job submission

Welcome
Learn about the core capabilities of Teracloud® Streams, its architecture, and key concepts.
Installing
Use this information to install, upgrade, and uninstall the Teracloud® Streams product.
Configuring
Create a basic or an enterprise domain which is a single point for configuring and managing common resources, security, and instances.
Administering
Administer the product by using the Teracloud® Streams graphical user interface, APIs, or the streamtool command-line interface.
Developing
Develop stream applications with the Streams Processing Language (SPL), Java, and Python.
Troubleshooting
Resolve problems with Teracloud® Streams using the troubleshooting tools provided with the product as well as the resources offered by Teracloud Support.
Reference
Find details on the SPL language, toolkits, APIs, commands, and more.
- APIs
  Application programming interfaces (APIs) provide functions that simplify applications development.
- Job configuration overlays
  You can specify or change configuration parameters when you use the submitjob or updateoperators operations. The settings control submission constraints, host constraints and locations, and operator status. Parameters are captured and updated in the configuration JSON file. When you change the values in the job configuration overlay file, the changes override any previously set values.
- Commands
  Teracloud® Streams provides a number of commands you use to perform tasks.
- Operator model
  An operator model is an XML document that describes the basic properties of a primitive operator.
- Streams Processing Language (SPL)
  Streams Processing Language (SPL) is a distributed data flow composition language that is used in Teracloud® Streams. SPL has primitive types, program structures, and definitions that are tailored for streaming data.
- Toolkits
  A toolkit is a set of SPL artifacts, which are organized into a package. Toolkits make SPL or native functions and primitive or composite operators reusable across different applications.
  - Specialized toolkit requirements and restrictions
    Several of the specialized toolkits require RPMs that are not required by the Teracloud® Streams product. There are also toolkit restrictions on some platforms.
  - Toolkits
- SPLDOC markup
  You can use SPLDOC markup in the descriptions associated with the SPL artifacts in a toolkit. The spl-make-doc command generates HTML documentation from the marked up artifacts.
Glossary
Use this glossary to find terms and definitions for Teracloud® Streams.

Distributing files to processing chains defined on job submission

To increase the throughput of your application, you distribute the detected input files to many processing chains which all work in parallel on the data. When your business logic does not use User Defined Parallelism (UDP) itself, you can enable UDP for the framework and provide the wanted number of chains on job submission.

The Round Robin distribution that is used here is simple and incurs no extra effort. The chains might not be loaded equally if sizes of input files differ significantly. Chains processing small files can become underutilized and the overall throughput degrades. File name queues are kept in the ChainProcessors and are not limited in size, to cope with bursts of incoming data files. Use this mechanism if you expect input files of roughly the same size or files continuously landing in input directories.

Round Robin distribution

About this task

Distribute input files in round-robin manner to the parallel processing chains whose number is passed to the application on job submission.

Procedure

In the file <PathToYourApplication>/config/config.cfg, find the ite.ingest.loadDistribution parameter description
To select the round-robin file distribution, set the parameter value as follows: ite.ingest.loadDistribution=roundRobin
In the file <PathToYourApplication>/config/config.cfg, find ite.ingest.loadDistribution.udp parameter description
Enable user-defined parallelism by setting the parameter to on as follows: ite.ingest.loadDistribution.udp=on

CAUTION: Remember to provide the needed number of chains when submitting the job by using the streamtool command-line option ‘—P’ and the parameter ite.ingest.loadDistribution.groupConfigFile.chains.