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https://issues.apache.org/jira/browse/NIFI-12308?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Handermann resolved NIFI-12308.
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Resolution: Fixed
> Create Python Processors' environment in background
> ---------------------------------------------------
>
> Key: NIFI-12308
> URL: https://issues.apache.org/jira/browse/NIFI-12308
> Project: Apache NiFi
> Issue Type: Improvement
> Components: Core Framework
> Reporter: Mark Payne
> Assignee: Mark Payne
> Priority: Major
> Fix For: 2.0.0
>
> Time Spent: 50m
> Remaining Estimate: 0h
>
> When a Python processor is added to the canvas, we create a new Python
> environment for it as part of the Processor creation. This typically takes on
> the order of 4-5 seconds but can take a bit longer. Generally, this isn't a
> huge concern. However, when adding a flow from registry or from a snapshot
> .json file, it can result in very long delays. We should instead move the
> environment creation to a background thread and make the Processor invalid
> until it's finished, in much the same way that we do with 3rd party
> dependency downloads.
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