Siddhant Sangwan created HDDS-5728:
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Summary: 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
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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