adoroszlai commented on a change in pull request #2897:
URL: https://github.com/apache/ozone/pull/2897#discussion_r794004283
##########
File path:
hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/container/states/ContainerAttribute.java
##########
@@ -189,7 +189,11 @@ public boolean remove(T key, ContainerID value) {
Preconditions.checkNotNull(key);
if (this.attributeMap.containsKey(key)) {
- return Collections.unmodifiableNavigableSet(this.attributeMap.get(key));
+ NavigableSet<ContainerID> returneSet = new TreeSet<>();
+ TreeSet<ContainerID> tmpSet = (TreeSet<ContainerID>)
Review comment:
Is the cast necessary?
```suggestion
NavigableSet<ContainerID> tmpSet =
```
##########
File path:
hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/container/states/ContainerAttribute.java
##########
@@ -189,7 +189,11 @@ public boolean remove(T key, ContainerID value) {
Preconditions.checkNotNull(key);
if (this.attributeMap.containsKey(key)) {
- return Collections.unmodifiableNavigableSet(this.attributeMap.get(key));
+ NavigableSet<ContainerID> returneSet = new TreeSet<>();
Review comment:
> One thing is to build the metric of state count will be expensive.
We could avoid copy on read by making `ContainerAttribute` store
`ConcurrentSkipListSet` instead of `TreeSet`.
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