Siyao Meng created HDDS-6696:
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Summary: 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
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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