David Handermann created NIFI-12290:
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Summary: Move from Quartz to Spring Cron Expression
Key: NIFI-12290
URL: https://issues.apache.org/jira/browse/NIFI-12290
Project: Apache NiFi
Issue Type: Improvement
Components: Core Framework
Reporter: David Handermann
Assignee: David Handermann
Fix For: 2.latest
The Quartz library supports [cron|https://en.wikipedia.org/wiki/Cron]
expression parsing to enable framework component scheduling using the Cron
strategy.
The Quartz library includes several legacy dependencies on HikariCP and C3P0
which are not necessary for framework operations. The Quartz library also
relies on {{java.util.Date}} for calculation, as opposed to {{java.time}}
components.
Spring Framework 5.3 introduced new [Cron Expression
capabilities|https://spring.io/blog/2020/11/10/new-in-spring-5-3-improved-cron-expressions]
that provide standard compatibility with [Cron scheduling
expressions|https://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/scheduling/support/CronExpression.html].
The Spring CronExpression supports standard {{java.time}} classes.
The Spring
[CronExpression|https://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/scheduling/support/CronExpression.html]
has two differences from the Quartz implementation:
1. The Year field is not supported
2. The numeric day of the week representation begins with 0 instead of 1
These differences follow the capabilities of the standard Unix crontab, and are
not commonly used. However, these differences could invalidate custom
scheduling configurations that used numeric day of the week or year values.
Based on existing NiFI framework use of Spring, Quartz should be replaced with
Spring Cron Expression parsing.
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