Siyao Meng created HDDS-17262:
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             Summary: Remove unused config 
hdds.datanode.disk.check.io.test.count
                 Key: HDDS-17262
                 URL: https://issues.apache.org/jira/browse/HDDS-17262
             Project: Apache Ozone
          Issue Type: Sub-task
          Components: Ozone Datanode
            Reporter: Siyao Meng


HDDS-13108 moved volume IO test failures to a time-based sliding window. Since 
then nothing reads {{hdds.datanode.disk.check.io.test.count}}.

Its description still says the volume fails when more than 
{{io.failures.tolerated}} of the last N tests failed, and that setting it to 0 
disables IO tests. Neither is true anymore; IO tests are disabled with 
{{hdds.datanode.disk.check.io.test.enabled=false}}. In the PR #8843 review it 
was noted that the property's function was "half removed", and that it cannot 
go through DeprecationDelta because the new property has a different type.

Proposal:
* Remove the property and its accessors.
* Describe {{hdds.datanode.disk.check.io.failures.tolerated}} in terms of 
{{hdds.datanode.disk.check.sliding.window.timeout}}.

Clusters that still set the key are unaffected, since the value is already 
ignored.



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