xBis7 commented on code in PR #5651:
URL: https://github.com/apache/ozone/pull/5651#discussion_r1406876671
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hadoop-ozone/recon/src/main/java/org/apache/hadoop/ozone/recon/fsck/ContainerHealthStatus.java:
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@@ -48,8 +48,12 @@ public class ContainerHealthStatus {
int repFactor = container.getReplicationConfig().getRequiredNodes();
this.healthyReplicas = healthyReplicas
.stream()
- .filter(r -> !r.getState()
- .equals((ContainerReplicaProto.State.UNHEALTHY)))
+ // Filter unhealthy replicas and
+ // replicas belonging to out-of-service nodes.
+ .filter(r ->
+ (!r.getDatanodeDetails().isDecommissioned() &&
+ !r.getDatanodeDetails().isMaintenance() &&
Review Comment:
As far as I understand, a node doesn’t go offline until its replicas have
been copied to another node. While ENTERING_MAINTENANCE or DECOMMISSIONING
container replicas are added or removed as needed to maintain proper
replication. The container will be under-replicated until copies have been made
and the node successfully becomes offline.
Once that is done, the container is correctly replicated, has 3 healthy and
available replicas and 1 offline. SCM doesn’t report any under-replicated or
over-replicated containers but Recon
- for master, counts 1 over-replicated because it sees 4 replicas (no
distinction between online - offline).
- for this patch, 0 count.
When the offline datanode is stopped, SCM doesn’t count unhealthy containers
and
- for master, Recon no longer counts 1 over-replicated container.
- for this patch, no change in Recon.
When having 3 healthy replicas and 3 nodes, and 1 of them prepares to go
offline, the container is temporarily under-replicated until a replica copy is
created. Once that is done, then the container is considered properly
replicated and the node goes offline. There should no longer be an issue of
under-replication.
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