Stephen O'Donnell created HDDS-7917:
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Summary: 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
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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