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Posted to issues@ozone.apache.org by "Tsz-wo Sze (Jira)" <ji...@apache.org> on 2026/05/15 06:00:00 UTC

[jira] [Resolved] (HDDS-15275) DiskBalancer getIdealUsage handles zero capacity incorrectly

     [ https://issues.apache.org/jira/browse/HDDS-15275?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tsz-wo Sze resolved HDDS-15275.
-------------------------------
    Fix Version/s: 2.2.0
       Resolution: Fixed

The pull request is now merged.  Thanks, [~slfan1989]!

> DiskBalancer getIdealUsage handles zero capacity incorrectly
> ------------------------------------------------------------
>
>                 Key: HDDS-15275
>                 URL: https://issues.apache.org/jira/browse/HDDS-15275
>             Project: Apache Ozone
>          Issue Type: Improvement
>            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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