Stephen O'Donnell created HDDS-7341:
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Summary: EC: Close pipelines with unregistered nodes
Key: HDDS-7341
URL: https://issues.apache.org/jira/browse/HDDS-7341
Project: Apache Ozone
Issue Type: Sub-task
Components: SCM
Reporter: Stephen O'Donnell
Assignee: Stephen O'Donnell
A datanode is stopped and before the stale node handler is triggered, SCM is
restarted. When SCM restarts its loads all the only pipelines and nodes from
RocksDB, and then all the nodes will register again.
In the case of EC pipelines, there is nothing to trigger the close of a
pipeline (and the containers on it) except:
1. The Container getting full and the DN triggering the close
2. The stale / dead node handlers noticing a node on it has gone dead.
In the case above, the EC pipeline will sit forever in an Open state, but any
attempt to write to it will likely result in errors on the client due to one of
the nodes not being available. These errors still will not trigger it to close.
A solution to this problem, is to add logic to the pipeline scrubber to close
any pipelines that have unregistered nodes. Stale / Dead nodes should be
handled by the existing stale / dead node handlers.
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