Pipeline ConceptsΒΆ

Pachyderm Pipeline System (PPS) is the computational component of the Pachyderm platform that enables you to perform various transformations on your data. Pachyderm pipelines have the following main concepts:

Pipeline

A pipeline is a job-spawner that waits for certain conditions to be met. Most commonly, this means watching one or more Pachyderm repositories for new commits of data. When new data arrives, a pipeline executes a user-defined piece of code to perform an operation and process the data. Each of these executions is called a job.

Pachyderm has the following special types of pipelines:

Cron
A cron input enables you to trigger the pipeline code at a specific interval. This type of pipeline is useful for such tasks as web scraping, querying a database, and other similar operations where you do not want to wait for new data, but instead trigger the pipeline periodically.
Service
A service is a special type of pipeline that instead of executing jobs and then waiting, permanently runs a serving data through an endpoint. For example, you can be serving an ML model or a REST API that can be queried. A service reads data from Pachyderm but does not have an output repo.
Spout
A spout is a special type of pipeline for ingesting data from a data stream. A spout can subscribe to a message stream, such as Kafka or Amazon SQS, and ingest data when it receives a message. A spout does not have an input repo.
Job
A job is an individual execution of a pipeline. A job can succeed or fail. Within a job, data and processing can be broken up into individual units of work called datums.
Datum
A datum is the smallest indivisible unit of work within a job. Different datums can be processed in parallel within a job.

Read the sections below to learn more about these concepts: