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https://issues.apache.org/jira/browse/HDDS-15805?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tsz-wo Sze updated HDDS-15805:
------------------------------
Description:
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 distances are the same so the current code may return
Dn1, Dn3, Dn2. Then the Client may stream Dn1 -> Dn3 -> Dn2 which
unnecessarily crossing the racks one more time.
was:
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.
> NetworkTopologyImpl.sortByDistanceCost should account for racks
> ---------------------------------------------------------------
>
> Key: HDDS-15805
> URL: https://issues.apache.org/jira/browse/HDDS-15805
> Project: Apache Ozone
> Issue Type: Sub-task
> Components: SCM
> Reporter: Tsz-wo Sze
> Assignee: Tsz-wo Sze
> Priority: Major
>
> 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 distances are the same so the current code may
> return Dn1, Dn3, Dn2. Then the Client may stream Dn1 -> Dn3 -> Dn2 which
> unnecessarily crossing the racks one more time.
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