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https://issues.apache.org/jira/browse/HDDS-14175?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tsz-wo Sze updated HDDS-14175:
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Summary: Disk balancer should not call getCurrentUsage() multiple times
(was: DefaultVolumeChoosingPolicy should not call getCurrentUsage() multiple
times)
> Disk balancer should not call getCurrentUsage() multiple times
> --------------------------------------------------------------
>
> Key: HDDS-14175
> URL: https://issues.apache.org/jira/browse/HDDS-14175
> Project: Apache Ozone
> Issue Type: Sub-task
> Components: Ozone Datanode
> Reporter: Tsz-wo Sze
> Assignee: Tsz-wo Sze
> Priority: Major
> Labels: pull-request-available
>
> In DefaultVolumeChoosingPolicy.chooseVolume(..), getCurrentUsage() is called
> multiple times so it can return different values. The biggest problem is the
> sorted(..) call. The code calls getCurrentUsage() in the comparator. The
> behavior is ill-defined for sorting changing values.
> Another bug is that it has filtered the volumes > threshold first and then
> choose destVolume. The destVolume must also be > threshold, which is
> undesiable.
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