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Overview

This feature is in private beta. Email support@snaplogic.com for an invitation to gain early access.

SnapLogic^® Cache Pipelines is a subscription feature that enables you to cache reference information in a pipeline. The reference information is generated using Cache Pipelines stored in-memory for a running pipeline, and Expression Language lookup functions retrieve it, taking advantage of Snaplexes running pipelines with any endpoint. Cache Pipelines are supported on all Snaplex types. Looking up values in an external system is a costly operation if the table is queried repeatedly, using the same data as reference fields. An in-memory data store allows your pipelines to look up keys/values/data in other Snaps at runtime.

If you have data in an external system that you plan to look up (such as an object or ID), then you can use Cache Pipelines to perform this operation. For example, if you want to look up a department for a set of user IDs in a columnar way, you can use Cache Pipelines. First, you create a generic pipeline (called a cache pipeline in this article) that is specified in your processing pipeline (called a main pipeline in this article). Then, the main pipeline can access the output documents in the cache pipeline using the retrieve expression language functions.

In this article

Key Components

The Cache Pipelines feature introduces a new property to the the Edit Pipeline dialog, where you can specify a pipeline to run and an alias to use to reference the documents in the pipeline run output. You can then reference a cache pipeline with the cached data as the value. The alias value is then used as a reference in the new retrieve expression language function in the SnapLogic expression language. The path to the cache pipeline can be defined by an expression based on pipeline parameters.

Cache Pipeline properties that allow specification of a pipeline path and corresponding cache lookup alias
Retrieve expression language functions that allow you to look up records based on a cache alias and a filter object
Caches up to 100,000 records using a pipeline-local in-memory lookup
Values of pipeline parameters are overridden by the parameters from the main pipeline

Workflow

Create a main pipeline
Add a new pipeline or use an existing pipeline that contains data that you want to cache for reference in the main pipeline.
Set the pipeline path to the pipeline created in Step 2 and specify an alias for the cached data
Add a mapper that retrieves data from the cache specified in Step 3
Run the main pipeline

Prerequisites

Your Org must have a subscription to the Cache Pipelines feature.

Usage Guidelines

Cache Pipelines must have the following input and output views:
- 0 unconnected input views (Binary or Document)
- 1 unconnected Document output view
- 0 unconnected Binary output views
The output document must have a flattened document structure. None of the values for primary keys can have objects or arrays as part of their structure.
Pipeline parameters are passed to the Cache Pipelines from the main pipelines that specify them. This also passes through the Pipeline Execute Snap to the child pipeline and to the child pipeline’s cache pipeline.
If only the alias or path (but not both) are defined, that pipeline is skipped.
Pipelines may be defined using expression properties, specifically leveraging pipeline parameters, but not leveraging expression library functions.
The definition of the same alias in multiple Cache Pipelines will result in the last defined pipeline populating the data for that specific Cache Pipelines.

Limitations

If the last Snap in your cache pipeline has an output document that contains an array or object as part of its structure, you need to restructure your data or remove those fields to produce a flat document structure.
If an Ultra Task has a cache pipeline, updates to the cache pipeline do not force an Ultra Task to restart
Dynamic validation is limited to 50 documents.
Pipelines with Cache Pipelines need to run to completion. Accordingly, we do not recommend using messenger service Snaps (like JMS or Kafka) or the Ultra Polling design.
The following features are untested in combination with Cache Pipelines:
- Error Pipelines
- Resumable Pipelines
- ELT Snap Packs

Cache Pipelines (Private Beta)