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Posted to issues@ozone.apache.org by "Tsz-wo Sze (Jira)" <ji...@apache.org> on 2026/07/09 23:03:00 UTC

[jira] [Created] (HDDS-15805) NetworkTopologyImpl.sortByDistanceCost should account for racks

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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