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https://issues.apache.org/jira/browse/HDDS-5728?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated HDDS-5728:
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Labels: pull-request-available (was: )
> ContainerBalancer should use remaining space to calculate utilization.
> ----------------------------------------------------------------------
>
> Key: HDDS-5728
> URL: https://issues.apache.org/jira/browse/HDDS-5728
> Project: Apache Ozone
> Issue Type: Sub-task
> Components: SCM
> Reporter: Siddhant Sangwan
> Assignee: Siddhant Sangwan
> Priority: Major
> Labels: pull-request-available
>
> ContainerBalancer gets a list of datanodes sorted according to their
> utilizations using NodeManager#getMostOrLeastUsedDatanodes.
> There are two ways of calculating utilization:
> # {{used space / capacity}}
> # {{(capacity - remaining) / capacity}}
> {{Used}} space is obtained using the DU or DF command (SpaceUsageSource),
> while {{remaining}} can either be {{capacity - used}} or calculated using the
> java.io.File#getUsableSpace method. This means the two ways of calculating
> utilization might give different results (when {{used}} is not equal to
> {{capacity - remaining}}).
> Currently, NodeManager#getMostOrLeastUsed uses method 2 while balancer uses
> method 1.
> Instead, both should consistently use the same approach. We prefer method 2
> since the {{remaining}} space calculation will also account for space used by
> processes other than Ozone. See the documentation in VolumeInfo for further
> details on calculating {{remaining}} space.
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