siddhantsangwan commented on code in PR #5261:
URL: https://github.com/apache/ozone/pull/5261#discussion_r1321411776
##########
hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/container/replication/LegacyReplicationManager.java:
##########
@@ -1141,8 +1141,103 @@ private void handleUnderReplicatedHealthy(final
ContainerInfo container,
List<ContainerReplica> replicationSources =
getReplicationSources(container,
replicaSet.getReplicas(), State.CLOSED, State.QUASI_CLOSED);
// This method will handle topology even if replicasNeeded <= 0.
- replicateAnyWithTopology(container, replicationSources,
- placementStatus, replicasNeeded);
+ try {
+ replicateAnyWithTopology(container, replicationSources,
+ placementStatus, replicasNeeded);
+ } catch (SCMException e) {
+ if (e.getResult()
+ .equals(SCMException.ResultCodes.FAILED_TO_FIND_SUITABLE_NODE) &&
+ replicasNeeded > 0) {
+ /*
+ If we reach here, the container is under replicated but placement
+ policy could not find any target Datanodes to host new replicas.
+ We can try unblocking under replication handling by removing any
+ unhealthy replicas. This will free up those datanodes, so they can host
+ healthy replicas.
+ */
+ deleteUnhealthyReplicaIfNeeded(container, replicaSet);
+ }
+ }
+ }
+
+ /**
+ * Finds and deletes an unhealthy replica (UNHEALTHY or QUASI_CLOSED) under
+ * certain conditions.
+ */
+ private void deleteUnhealthyReplicaIfNeeded(ContainerInfo container,
+ RatisContainerReplicaCount replicaCount) {
+ LOG.info("Finding an unhealthy replica to delete for container {} with " +
+ "replicas {} to unblock under replication handling.", container,
+ replicaCount.getReplicas());
+
+ int pendingDeletes = getInflightDel(container.containerID());
+ if (pendingDeletes > 0) {
+ LOG.debug("Container {} has {} pending deletes. Will not delete an " +
+ "unhealthy replica for this container.", container, pendingDeletes);
+ return;
+ }
+
+ List<ContainerReplica> replicas = replicaCount.getReplicas();
+ if (replicas.size() < 3) {
+ LOG.debug("Container {} has only {} replicas. Will not delete an " +
+ "unhealthy replica for this container.", container, replicas.size());
+ return;
+ }
+
+ LifeCycleState containerState = container.getState();
+ boolean foundMatchingReplica = false;
+ for (ContainerReplica replica : replicas) {
+ if (compareState(containerState, replica.getState())) {
+ foundMatchingReplica = true;
+ break;
+ }
+ }
+ if (!foundMatchingReplica) {
+ LOG.debug("No matching replica found for container {} with replicas " +
+ "{}. Will not delete any unhealthy replica for this container.",
+ container, replicas);
+ return;
+ }
+
+ List<ContainerReplica> deleteCandidates = new ArrayList<>();
+ // collect unhealthy replicas on in-service, healthy nodes
+ for (ContainerReplica replica : replicas) {
+ try {
+ NodeStatus nodeStatus =
+ nodeManager.getNodeStatus(replica.getDatanodeDetails());
+ if (!nodeStatus.isHealthy() || !nodeStatus.isInService()) {
+ continue;
+ }
+ } catch (NodeNotFoundException e) {
+ LOG.warn("Skipping replica {} when trying to unblock under " +
+ "replication handling.", replica, e);
+ continue;
+ }
+
+ if (replica.getState() == State.QUASI_CLOSED) {
+ deleteCandidates.add(replica);
+ } else if (replica.getState() == State.UNHEALTHY) {
+ deleteCandidates.add(replica);
+ }
Review Comment:
I'm avoiding this check as it'll also return true for cases like closed
container with closing replica, quasi-closed container with closing replica
etc. Instead, I'm now doing
```
if (containerState != LifeCycleState.QUASI_CLOSED &&
replica.getState() == State.QUASI_CLOSED) {
// a quasi_closed replica is a candidate only if its seq id is less
// than the container's
if (replica.getSequenceId() < containerSeq) {
deleteCandidates.add(replica);
}
} else if (replica.getState() == State.UNHEALTHY) {
deleteCandidates.add(replica);
}
}
```
which should do what we want.
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