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https://issues.apache.org/jira/browse/HDDS-15300?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated HDDS-15300:
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Labels: pull-request-available (was: )
> Handle zero-capacity volumes in DiskBalancer policy
> ---------------------------------------------------
>
> Key: HDDS-15300
> URL: https://issues.apache.org/jira/browse/HDDS-15300
> Project: Apache Ozone
> Issue Type: Bug
> Reporter: Shilun Fan
> Assignee: Shilun Fan
> Priority: Major
> Labels: pull-request-available
>
> DefaultContainerChoosingPolicy may fail with a NullPointerException when the
> volume set contains a zero-capacity volume.
> The policy creates VolumeFixedUsage objects for all volumes and sorts them by
> VolumeFixedUsage#getUtilization. However, VolumeFixedUsage stores utilization
> as null when the underlying volume capacity is 0.
> Calling getUtilization() then triggers Objects.requireNonNull and throws
> NullPointerException.
> This can happen before DiskBalancer starts choosing source/destination
> volumes, so one unusable zero-capacity volume can prevent the policy from
> evaluating otherwise valid volumes.
> DiskBalancer should skip zero-capacity volumes before sorting and continue
> with the remaining valid volumes. If fewer than two valid volumes remain, the
> policy should return no candidate instead of failing.
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