codelipenghui commented on code in PR #20642:
URL: https://github.com/apache/pulsar/pull/20642#discussion_r1243457522
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pulsar-metadata/src/main/java/org/apache/pulsar/metadata/bookkeeper/PulsarRegistrationClient.java:
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@@ -153,42 +178,57 @@ public void unwatchReadOnlyBookies(RegistrationListener
registrationListener) {
readOnlyBookiesWatchers.remove(registrationListener);
}
- private void handleDeletedBookieNode(Notification n) {
- if (n.getType() == NotificationType.Deleted) {
- BookieId bookieId = stripBookieIdFromPath(n.getPath());
- if (bookieId != null) {
- log.info("Bookie {} disappeared", bookieId);
- bookieServiceInfoCache.remove(bookieId);
- }
+ /**
+ * This method will receive metadata store notifications and then update
the
+ * local cache in background sequentially.
+ */
+ private void updatedBookies(Notification n) {
+ // make the notification callback run sequential in background.
+ final String path = n.getPath();
+ if (!path.startsWith(bookieReadonlyRegistrationPath) ||
!path.startsWith(bookieRegistrationPath)) {
+ // ignore unknown path
+ return;
}
- }
-
- private void handleUpdatedBookieNode(Notification n) {
- BookieId bookieId = stripBookieIdFromPath(n.getPath());
+ final BookieId bookieId = stripBookieIdFromPath(n.getPath());
if (bookieId != null) {
- log.info("Bookie {} info updated", bookieId);
- readBookieServiceInfoAsync(bookieId);
+ log.info("Bookie {} do {}. path: {}", bookieId, n.getType(),
n.getPath());
}
- }
-
- private void updatedBookies(Notification n) {
- if (n.getType() == NotificationType.Created || n.getType() ==
NotificationType.Deleted) {
- if (n.getPath().startsWith(bookieReadonlyRegistrationPath)) {
- getReadOnlyBookies().thenAccept(bookies -> {
- readOnlyBookiesWatchers.forEach(w -> executor.execute(()
-> w.onBookiesChanged(bookies)));
- });
- handleDeletedBookieNode(n);
- } else if (n.getPath().startsWith(bookieRegistrationPath)) {
- getWritableBookies().thenAccept(bookies ->
- writableBookiesWatchers.forEach(w ->
executor.execute(() -> w.onBookiesChanged(bookies))));
- handleDeletedBookieNode(n);
- }
- } else if (n.getType() == NotificationType.Modified) {
- if (n.getPath().startsWith(bookieReadonlyRegistrationPath)
- || n.getPath().startsWith(bookieRegistrationPath)) {
- handleUpdatedBookieNode(n);
+ sequencer.sequential(() -> {
+ switch (n.getType()) {
+ case Created:
+ if (path.equals(bookieReadonlyRegistrationPath)) {
+ return getReadOnlyBookies().thenAccept(bookies ->
+ readOnlyBookiesWatchers.forEach(w ->
+ executor.execute(() ->
w.onBookiesChanged(bookies))));
+ }
+ return getWritableBookies().thenAccept(bookies ->
+ writableBookiesWatchers.forEach(w ->
+ executor.execute(() ->
w.onBookiesChanged(bookies))));
+ case Modified:
+ if (bookieId == null) {
+ return completedFuture(null);
+ }
+ if (path.equals(bookieReadonlyRegistrationPath)) {
+ return
readBookieInfoAsReadonlyBookie(bookieId).thenApply(__ -> null);
+ }
+ return readBookieServiceInfoAsync(bookieId).thenApply(__
-> null);
Review Comment:
Ok, got it.
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