leventov commented on a change in pull request #7088: Improve parallelism of
zookeeper based segment change processing
URL: https://github.com/apache/incubator-druid/pull/7088#discussion_r277036465
##########
File path:
server/src/main/java/org/apache/druid/server/coordinator/CuratorLoadQueuePeon.java
##########
@@ -406,11 +409,11 @@ public void addCallback(LoadPeonCallback newCallback)
}
}
- LoadPeonCallback[] getCallbacks()
+ List<LoadPeonCallback> snapshotCallbacks()
{
synchronized (callbacks) {
// Return a copy so that callers get a consistent view
Review comment:
I think the comment like the following would be better:
```
Return a copy to avoid a race condition, see
https://github.com/code-review-checklists/java-concurrency#unsafe-concurrent-iteration
```
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