poorbarcode commented on code in PR #23049:
URL: https://github.com/apache/pulsar/pull/23049#discussion_r1682365888
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pulsar-broker/src/main/java/org/apache/pulsar/broker/namespace/NamespaceService.java:
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@@ -1509,6 +1514,31 @@ public CompletableFuture<List<String>>
getListOfTopics(NamespaceName namespaceNa
}
}
+ public CompletableFuture<List<String>> getListOfUserTopics(NamespaceName
namespaceName, Mode mode) {
+ String key = String.format("%s://%s", mode, namespaceName);
+ CompletableFuture<List<String>> queryRes =
+ inProgressQueryUserTopics.computeIfAbsent(key, k -> {
+ CompletableFuture<List<String>> res = new CompletableFuture<>();
+ // Switch thread to avoid blocking other threads who are calling
the current method.
+ pulsar.getExecutor().execute(() -> {
+ getListOfTopics(namespaceName, mode).thenApply(list -> {
+ return TopicList.filterSystemTopic(list);
+ }).whenComplete((topics, ex) -> {
+ if (ex != null) {
+ res.completeExceptionally(ex);
+ } else {
+ res.complete(topics);
+ }
+ });
+ });
+ return res;
+ });
+ queryRes.whenComplete((ignore, ex) -> {
Review Comment:
> Outputs:
> Remove 1
> Remove 1
> Remove 1
> Remove 1
The code you provided is the evidence that the first task blocks other
threads, which answered your below question:
https://github.com/apache/pulsar/pull/23049#discussion_r1682326069
>The existing code looks like:
> ...
> The fix:
> ...
The difference between the two examples: the `CompletableFuture` in the
second code never complete.
And all the tasks run on a same thread, which is wrong
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