Ivan Andika created HDDS-13928:
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Summary: Cleanup orphan blocks on datanodes that are recommissioned
Key: HDDS-13928
URL: https://issues.apache.org/jira/browse/HDDS-13928
Project: Apache Ozone
Issue Type: Sub-task
Reporter: Ivan Andika
Thought of one case that might cause orphan blocks
1. A CLOSED Container 1 contains replicas in [DN1, DN2, DN3]
2. A delete transaction is created for Container 1 blocks, but not yet sent
3. DN1 is marked as DEAD and SCM removes the the container replica
4. SCM replicates the Container 1 to DN4
5. Delete commands are sent to [DN2, DN3, DN4]
6. DN2, DN3, DN4 finished the deletion and acknowleged to SCM
7. SCM removes the delete transaction
8. DN1 comes back alive
9. The overreplicated replica DN4 is removed
Notice that since the deletion transaction has been removed, the undeleted
blocks in DN1 will be orphaned and will never be deleted.
We need a way to handle this case.
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