mattisonchao commented on code in PR #23786:
URL: https://github.com/apache/pulsar/pull/23786#discussion_r1897935900
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pulsar-broker/src/main/java/org/apache/pulsar/broker/service/SystemTopicBasedTopicPoliciesService.java:
##########
@@ -267,37 +268,38 @@ public CompletableFuture<Optional<TopicPolicies>>
getTopicPoliciesAsync(TopicNam
return CompletableFuture.completedFuture(Optional.empty());
}
final CompletableFuture<Boolean> preparedFuture =
prepareInitPoliciesCacheAsync(topicName.getNamespaceObject());
- final var resultFuture = new
CompletableFuture<Optional<TopicPolicies>>();
- preparedFuture.thenAccept(inserted ->
policyCacheInitMap.compute(namespace, (___, existingFuture) -> {
- if (!inserted || existingFuture != null) {
- final var partitionedTopicName =
TopicName.get(topicName.getPartitionedTopicName());
- final var policies = Optional.ofNullable(switch (type) {
- case DEFAULT ->
Optional.ofNullable(policiesCache.get(partitionedTopicName))
- .orElseGet(() ->
globalPoliciesCache.get(partitionedTopicName));
- case GLOBAL_ONLY ->
globalPoliciesCache.get(partitionedTopicName);
- case LOCAL_ONLY -> policiesCache.get(partitionedTopicName);
- });
- resultFuture.complete(policies);
- } else {
- CompletableFuture.runAsync(() -> {
- log.info("The future of {} has been removed from cache,
retry getTopicPolicies again", namespace);
- // Call it in another thread to avoid recursive update
because getTopicPoliciesAsync() could call
- // policyCacheInitMap.computeIfAbsent()
- getTopicPoliciesAsync(topicName,
type).whenComplete((result, e) -> {
- if (e == null) {
- resultFuture.complete(result);
- } else {
- resultFuture.completeExceptionally(e);
- }
- });
- });
+ // switch thread to avoid potential metadata thread cost and recursive
deadlock
+ return preparedFuture.thenComposeAsync(inserted -> {
+ @Data
+ class PoliciesFutureHolder {
Review Comment:
applied.
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