Tsz-wo Sze created HDDS-15805:
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Summary: NetworkTopologyImpl.sortByDistanceCost should account for
racks
Key: HDDS-15805
URL: https://issues.apache.org/jira/browse/HDDS-15805
Project: Apache Ozone
Issue Type: Improvement
Components: SCM
Reporter: Tsz-wo Sze
Assignee: Tsz-wo Sze
NetworkTopologyImpl.sortByDistanceCost currently sort only by distance. It
should also account for racks, i.e. datanodes in the same rack should be next
to each other.
|| Racks || Client/Datanodes ||
| R1 | Client |
| R2 | Dn1, Dn2 |
| R3 | Dn3 |
In the example above, the current code may return Dn1, Dn3, Dn2. Then the
Client may stream Dn1 -> Dn3 -> Dn2 which unnecessarily crossing the racks
twice.
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