sodonnel commented on code in PR #6367:
URL: https://github.com/apache/ozone/pull/6367#discussion_r1534051824
##########
hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/node/NodeDecommissionManager.java:
##########
@@ -368,6 +382,50 @@ public synchronized void startDecommission(DatanodeDetails
dn)
}
}
+ private synchronized boolean
checkIfDecommissionPossible(List<DatanodeDetails> dns, List<DatanodeAdminError>
errors) {
+ // do we require method synchronization?
+ int minInService = -1; // maxRatis = -1, maxEc = -1;
+ for (DatanodeDetails dn : dns) {
+ Set<ContainerID> containers;
+ try {
+ containers = nodeManager.getContainers(dn);
+ } catch (NodeNotFoundException ex) {
+ LOG.warn("The host {} was not found in SCM. Ignoring the request to " +
+ "decommission it", dn.getHostName());
+ errors.add(new DatanodeAdminError(dn.getHostName(),
+ "The host was not found in SCM"));
+ continue; // ignore the DN and continue to next one
+ }
+ for (ContainerID cid : containers) {
+ ContainerInfo cif;
+ try {
+ cif = containerManager.getContainer(cid);
+ } catch (ContainerNotFoundException ex) {
+ continue; // ignore the container and continue to next one
+ }
+ if (cif.getState().equals(HddsProtos.LifeCycleState.DELETED) ||
+ cif.getState().equals(HddsProtos.LifeCycleState.DELETING)) {
+ continue;
+ }
+ int reqNodes = cif.getReplicationConfig().getRequiredNodes();
+ if (reqNodes > minInService) {
+ minInService = reqNodes;
+ }
+ /* *below code would check the replication type and then get the factor,
+ but as we have a simpler way i.e., getRequiredNodes(), I don't think
we need to care about the replication type
+
+ HddsProtos.ReplicationType replicationType = cif.getReplicationType();
+ if (replicationType.equals(HddsProtos.ReplicationType.RATIS)) {
+ maxRatis = cif.getReplicationFactor().getNumber();
+ } else if (replicationType.equals(HddsProtos.ReplicationType.EC) {
+ //cif.getReplicationConfig();
+ }*/
Review Comment:
Yes, getRequiredNodes is the simplest way. Please remove the commented code
too (I think you left it there just to ask the question which is perfectly
fine).
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