Demogorgon314 commented on code in PR #18858:
URL: https://github.com/apache/pulsar/pull/18858#discussion_r1104137493
##########
pulsar-broker/src/main/java/org/apache/pulsar/broker/loadbalance/extensions/channel/ServiceUnitStateChannelImpl.java:
##########
@@ -621,25 +631,108 @@ private CompletableFuture<Integer>
closeServiceUnit(String serviceUnit) {
});
}
- private CompletableFuture<Void> splitServiceUnit(String serviceUnit) {
- // TODO: after the split we need to write the child ownerships to BSC
instead of ZK.
+ private CompletableFuture<Void> splitServiceUnit(String serviceUnit,
ServiceUnitStateData data) {
+ // Write the child ownerships to BSC.
long startTime = System.nanoTime();
- return pulsar.getNamespaceService()
- .splitAndOwnBundle(getNamespaceBundle(serviceUnit),
- false,
-
NamespaceBundleSplitAlgorithm.of(pulsar.getConfig().getDefaultNamespaceBundleSplitAlgorithm()),
- null)
- .whenComplete((__, ex) -> {
- double splitBundleTime = TimeUnit.NANOSECONDS
- .toMillis((System.nanoTime() - startTime));
- if (ex == null) {
- log.info("Successfully split {} namespace-bundle in {}
ms",
- serviceUnit, splitBundleTime);
- } else {
- log.error("Failed to split {} namespace-bundle in {}
ms",
- serviceUnit, splitBundleTime, ex);
- }
- });
+ NamespaceService namespaceService = pulsar.getNamespaceService();
+ NamespaceBundleFactory bundleFactory =
namespaceService.getNamespaceBundleFactory();
+ NamespaceBundle bundle = getNamespaceBundle(serviceUnit);
+ CompletableFuture<Void> completionFuture = new CompletableFuture<>();
+ final AtomicInteger counter = new AtomicInteger(0);
+ this.splitServiceUnitOnceAndRetry(namespaceService, bundleFactory,
bundle, serviceUnit, data,
+ counter, startTime, completionFuture);
+ return completionFuture;
+ }
+
+ @VisibleForTesting
+ protected void splitServiceUnitOnceAndRetry(NamespaceService
namespaceService,
+ NamespaceBundleFactory
bundleFactory,
+ NamespaceBundle bundle,
+ String serviceUnit,
+ ServiceUnitStateData data,
+ AtomicInteger counter,
+ long startTime,
+ CompletableFuture<Void>
completionFuture) {
+ CompletableFuture<List<NamespaceBundle>> updateFuture = new
CompletableFuture<>();
+
+ pulsar.getNamespaceService().getSplitBoundary(bundle,
null).thenAccept(splitBundlesPair -> {
+ // Split and updateNamespaceBundles. Update may fail because of
concurrent write to Zookeeper.
+ if (splitBundlesPair == null) {
+ String msg = format("Bundle %s not found under namespace",
serviceUnit);
+ updateFuture.completeExceptionally(new
BrokerServiceException.ServiceUnitNotReadyException(msg));
+ return;
+ }
+ List<CompletableFuture<Void>> futures = new ArrayList<>();
+ ServiceUnitStateData next = new ServiceUnitStateData(Owned,
data.broker());
+ NamespaceBundles targetNsBundle = splitBundlesPair.getLeft();
+ List<NamespaceBundle> splitBundles = splitBundlesPair.getRight();
+ List<NamespaceBundle> successPublishedBundles = new
CopyOnWriteArrayList<>();
+ for (NamespaceBundle sBundle : splitBundles) {
+ futures.add(pubAsync(sBundle.toString(), next).thenAccept(__
-> {
+ successPublishedBundles.add(sBundle);
+ }));
+ }
+ NamespaceName nsname = bundle.getNamespaceObject();
+ FutureUtil.waitForAll(futures)
+ .thenCompose(__ ->
namespaceService.updateNamespaceBundles(nsname, targetNsBundle))
+ .thenCompose(__ ->
namespaceService.updateNamespaceBundlesForPolicies(nsname, targetNsBundle))
+ .thenRun(() -> {
+
bundleFactory.invalidateBundleCache(bundle.getNamespaceObject());
+ updateFuture.complete(splitBundles);
+ }).exceptionally(e -> {
+ // Clean the new bundle when has exception.
+ List<CompletableFuture<Void>> futureList = new
ArrayList<>();
+ for (NamespaceBundle sBundle :
successPublishedBundles) {
+
futureList.add(tombstoneAsync(sBundle.toString()).thenAccept(__ -> {}));
+ }
+ FutureUtil.waitForAll(futureList)
+ .whenComplete((__, ex) -> {
+ if (ex != null) {
+ log.warn("Clean new bundles failed,",
ex);
+ }
+ updateFuture.completeExceptionally(e);
+ });
+ return null;
+ });
+ }).exceptionally(e -> {
+ updateFuture.completeExceptionally(e);
+ return null;
+ });
+
+ updateFuture.thenAccept(r -> {
Review Comment:
Yes, you can see when this method is completed, it will call
`completionFuture.complete(null);`. Why is it a problem to call an async method
in `thenAccept`?
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