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https://issues.apache.org/jira/browse/HDDS-7917?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated HDDS-7917:
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Labels: pull-request-available (was: )
> EC: ECBlockInputStream should try spare replicas on error
> ---------------------------------------------------------
>
> Key: HDDS-7917
> URL: https://issues.apache.org/jira/browse/HDDS-7917
> Project: Apache Ozone
> Issue Type: Sub-task
> Reporter: Stephen O'Donnell
> Assignee: Stephen O'Donnell
> Priority: Major
> Labels: pull-request-available
>
> In ECBlockInputStream, it is possible to have multiple locations for a single
> replicaIndex, if, say one replica is decommissioned but still online and
> there is also an IN_SERVICE replica.
> Similar for Maintenance - there can be maintenance and in_service replicas,
> or just over replicated replicas.
> As things stand, if a read to an index fails, it causes a failover to
> reconstruction read, but there are occassions where it would be possible to
> read from the spare replica and no need to fall back to reconstruction.
> This PR allows spare replicas to be tried before giving up with an error.
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