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https://issues.apache.org/jira/browse/HDDS-15275?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sammi Chen updated HDDS-15275:
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Parent: HDDS-5713
Issue Type: Sub-task (was: Improvement)
> DiskBalancer getIdealUsage handles zero capacity incorrectly
> ------------------------------------------------------------
>
> Key: HDDS-15275
> URL: https://issues.apache.org/jira/browse/HDDS-15275
> Project: Apache Ozone
> Issue Type: Sub-task
> Reporter: Shilun Fan
> Assignee: Shilun Fan
> Priority: Major
> Labels: pull-request-available
> Fix For: 2.2.0
>
>
> DiskBalancerVolumeCalculation#getIdealUsage does not explicitly handle empty
> volume lists or volume snapshots whose total capacity is zero.
> Current implementation sums the total capacity and effective used bytes, then
> directly divides:
> {code:java}
> return ((double) totalEffectiveUsed) / totalCapacity; {code}
> If the input volume list is empty, totalCapacity is 0, so the method returns
> NaN. If all volumes have zero capacity, the method may return NaN or Infinity
> depending on effective used bytes.
> This is inconsistent with the method Javadoc, which says an
> IllegalArgumentException is thrown when total capacity is zero.
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