315157973 commented on a change in pull request #9900:
URL: https://github.com/apache/pulsar/pull/9900#discussion_r594399795
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File path:
pulsar-broker-common/src/main/java/org/apache/pulsar/broker/resources/BaseResources.java
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@@ -97,6 +98,28 @@ public void set(String path, Function<T, T> modifyFunction)
throws MetadataStore
}
}
+ public void set(String path, OrderedExecutor executor, Function<T, T>
modifyFunction) throws MetadataStoreException {
+ CompletableFuture<Void> callback = new CompletableFuture<>();
+ // Use orderedExecutor to ensure that
+ // concurrent updates in each path are handled by a single thread
+ executor.executeOrdered(path, () ->
Review comment:
The version of zk is not stored with Policies, but a version of one
broker, which can only ensure that it is safe to update ZK concurrently between
different brokers.
t1: Thread-1 writes to zk, updates the local version to v1
t2: Thread-2 writes to zk(use v1) and updates the local version to v2
Local thread safety cannot be guaranteed.
I mentioned a plan in my previous PR, to save a copy of Zk verision to
Policies, so that it becomes an optimistic lock. But there are too many changes
in this plan.
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