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

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

     [ https://issues.apache.org/jira/browse/AMBARI-24768?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jonathan Hurley resolved AMBARI-24768.
--------------------------------------
    Resolution: Fixed

> 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
>            Priority: Critical
>              Labels: pull-request-available
>             Fix For: 2.8.0
>
>          Time Spent: 3h 40m
>  Remaining Estimate: 0h
>
> 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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