[jira] [Created] (AMBARI-24768) Load Upgrade Checks Dynamically From Stacks

["Jonathan Hurley (JIRA)" <ji...@apache.org>]

Jonathan Hurley created AMBARI-24768:
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             Summary: Load Upgrade Checks Dynamically From Stacks
                 Key: AMBARI-24768
                 URL: https://issues.apache.org/jira/browse/AMBARI-24768
             Project: Ambari
          Issue Type: Task
    Affects Versions: 2.8.0
            Reporter: Jonathan Hurley
            Assignee: Jonathan Hurley
             Fix For: 2.8.0


Stack-provided upgrade checks need to be loaded from a provided JAR when Ambari Server starts up. Currently, upgrade checks are loaded synchronously, scanning the entire classpath for classes matching {{UpgradeCheck}} in the package {{org.apache.ambari.server.checks}}. This can be extremely slow and cause Ambari Server to fail to start within a reasonable amount of time. The proposed changes for this issue are as follows: 

- Move to an asynchronous model for scanning the classpath for instances of {{UpgradeCheck}}
- Allow stacks to provide their own plugin directory & JAR for loading SPI implementations of {{UpgradeCheck}}



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