Jason918 commented on code in PR #17922:
URL: https://github.com/apache/pulsar/pull/17922#discussion_r994447189
##########
pulsar-metadata/src/main/java/org/apache/pulsar/metadata/bookkeeper/PulsarRegistrationClient.java:
##########
@@ -153,4 +212,56 @@ private static Set<BookieId>
convertToBookieAddresses(List<String> children) {
}
return newBookieAddrs;
}
+
+ @Override
+ public CompletableFuture<Versioned<BookieServiceInfo>>
getBookieServiceInfo(BookieId bookieId) {
+ // this method cannot perform blocking calls to the MetadataStore
+ // or return a CompletableFuture that is completed on the
MetadataStore main thread
+ // this is because there are a few cases in which some operations on
the main thread
+ // wait for the result. This is due to the fact that resolving the
address of a bookie
+ // is needed in many code paths.
+ Versioned<BookieServiceInfo> resultFromCache =
bookieServiceInfoCache.get(bookieId);
+ if (log.isDebugEnabled()) {
+ log.debug("getBookieServiceInfo {} -> {}", bookieId,
resultFromCache);
+ }
+ if (resultFromCache != null) {
+ return CompletableFuture.completedFuture(resultFromCache);
+ } else {
+ return FutureUtils.exception(new
BKException.BKBookieHandleNotAvailableException());
+ }
+ }
+
+ public CompletableFuture<Versioned<BookieServiceInfo>>
readBookieServiceInfoAsync(BookieId bookieId) {
+ String asWritable = bookieRegistrationPath + "/" + bookieId;
+ return bookieServiceInfoMetadataCache.get(asWritable)
Review Comment:
You refer to this `get` could be a blocking call.
My best guess is when the key is loading for the first time.
But the key call path should be like :
- org.apache.pulsar.metadata.cache.impl.MetadataCacheImpl#get
- com.github.benmanes.caffeine.cache.AsyncLoadingCache#get
- org.apache.pulsar.metadata.cache.impl.MetadataCacheImpl#readValueFromStore
and all of these should not contains any blocking operations.
##########
pulsar-metadata/src/main/java/org/apache/pulsar/metadata/bookkeeper/PulsarRegistrationClient.java:
##########
@@ -153,4 +212,56 @@ private static Set<BookieId>
convertToBookieAddresses(List<String> children) {
}
return newBookieAddrs;
}
+
+ @Override
+ public CompletableFuture<Versioned<BookieServiceInfo>>
getBookieServiceInfo(BookieId bookieId) {
Review Comment:
I am trying to get more sense from this issue, but I don't see this method
in the stack of https://github.com/apache/pulsar/issues/17913. Call you point
out the call path from metadata main thread?
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