[jira] [Updated] (HDDS-6696) BackgroundService schedules tasks back-to-back as it doesn't wait for task completion

["Siyao Meng (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDDS-6696?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Siyao Meng updated HDDS-6696:
-----------------------------
    Attachment: HDDS-6696.repro.001.patch

> BackgroundService schedules tasks back-to-back as it doesn't wait for task completion
> -------------------------------------------------------------------------------------
>
>                 Key: HDDS-6696
>                 URL: https://issues.apache.org/jira/browse/HDDS-6696
>             Project: Apache Ozone
>          Issue Type: Bug
>    Affects Versions: 1.3.0
>            Reporter: Siyao Meng
>            Priority: Major
>         Attachments: HDDS-6696.repro.001.patch
>
>
> HDDS-4231 removed the task result collection from {{PeriodicalTask#run()}}. This causes {{run()}} to return immediately after task dispatch.
> As a side effect, the {{exec.scheduleWithFixedDelay()}} no longer works as intended (that the specified interval is supposed to be the one between +the end of first task execution+ and +the start of the next task+).
> This makes it effectively the same as {{exec.scheduleAtFixedRate()}}, which might not be desired: Currently a very long running {{BackgroundService}} (i.e. run time exceeding the interval) will be triggered back-to-back. See attached unit test for a proof of repro.
> Note: Found this bug together with [~erose] while working on HDDS-6371, where we utilized {{BackgroundService}}.
> CC [~ljain]



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