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https://issues.apache.org/jira/browse/HDDS-7919?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Attila Doroszlai resolved HDDS-7919.
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Fix Version/s: 1.4.0
Resolution: Implemented
> EC: ECPipelineProvider.createForRead should filter out dead replicas and sort
> replicas
> --------------------------------------------------------------------------------------
>
> Key: HDDS-7919
> URL: https://issues.apache.org/jira/browse/HDDS-7919
> Project: Apache Ozone
> Issue Type: Sub-task
> Components: SCM
> Reporter: Stephen O'Donnell
> Assignee: Attila Doroszlai
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.4.0
>
>
> ECPipelineProvider.createForRead() is used to get a pipeline to read an EC
> block group.
> When there are nodes in maintenance, it is possible for there to be replica
> details in SCM for dead maintenance nodes, and they should not be returned to
> the client as they cannot be read.
> Additionally, it is possible for there to be multiple copies for a given
> replica index. Eg an IN_SERVICE replica and a DECOMMISSIONED or
> DECOMMISSIONING. As things stand, there is no order applied to the replicas,
> but the client reading code will tend to use the first replica it loads from
> the pipeline.
> Therefore we should exclude dead replicas, and then ensure that where there
> are multiple copies for a given replica index, HEALTHY (rather than STALE)
> are sorted first, and then sort by the SERVICE_STATE, putting IN_SERVICE
> before MAINTENANCE etc.
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