hadesy opened a new pull request #14176:
URL: https://github.com/apache/pulsar/pull/14176


   ### Motivation
   In Pulsar 2.9.1,updating namespace policy can cause deadlock if 
authorization is enabled,
   because we can't submit tasks in the thread of SingleThreadPoolExecutor,see 
test case.
   
https://github.com/apache/pulsar/blob/9165aed72ceb5511c575aae96d6002acec01e59b/pulsar-metadata/src/main/java/org/apache/pulsar/metadata/impl/AbstractMetadataStore.java#L79
   
   Log
   ```
   # Metadata listener was triggered at the same time.
   level:INFO
   
logger:org.apache.pulsar.broker.resourcegroup.ResourceGroupNamespaceConfigListener
   thread:metadata-store-6-1
   time:2022-02-08T06:26:43,527+0000
   message:Metadata store notification: Path /admin/policies/xxx/xxx, Type 
Modified
   
   # First partition succeeded.
   level:INFO
   logger:org.apache.pulsar.broker.admin.impl.PersistentTopicsBase
   thread:pulsar-web-36-8
   time:2022-02-08T06:26:43,528+0000
   message:[admin] Successfully granted access for role xxxxx: [produce] - 
topic persistent://xxx/xxx/xxx-partition-0
   
   # After 30 
seconds(org.apache.pulsar.broker.ServiceConfiguration#zooKeeperOperationTimeoutSeconds),
 second partition timeout.
   level:ERROR
   logger:org.apache.pulsar.broker.admin.impl.PersistentTopicsBase
   thread:pulsar-web-36-8
   time:2022-02-08T06:27:13,528+0000
   message:[admin] Failed to grant permissions for topic 
persistent://xxx/xxx/xxxxx-partition-1
   org.apache.pulsar.metadata.api.MetadataStoreException: Failed to set data 
for /admin/policies/xxx/xxx
        at 
org.apache.pulsar.broker.resources.BaseResources.set(BaseResources.java:106) 
~[org.apache.pulsar-pulsar-broker-common-2.9.1.jar:2.9.1]
        at 
org.apache.pulsar.broker.resources.NamespaceResources.setPolicies(NamespaceResources.java:113)
 ~[org.apache.pulsar-pulsar-broker-common-2.9.1.jar:2.9.1]
        at 
org.apache.pulsar.broker.admin.impl.PersistentTopicsBase.grantPermissions(PersistentTopicsBase.java:262)
 ~[org.apache.pulsar-pulsar-broker-2.9.1.jar:2.9.1]
        at 
org.apache.pulsar.broker.admin.impl.PersistentTopicsBase.internalGrantPermissionsOnTopic(PersistentTopicsBase.java:291)
 ~[org.apache.pulsar-pulsar-broker-2.9.1.jar:2.9.1]
        at 
org.apache.pulsar.broker.admin.v2.PersistentTopics.grantPermissionsOnTopic(PersistentTopics.java:174)
 ~[org.apache.pulsar-pulsar-broker-2.9.1.jar:2.9.1]
        at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
~[?:?]
        at 
jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
 ~[?:?]
        at 
jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 ~[?:?]
        at java.lang.reflect.Method.invoke(Method.java:566) ~[?:?]
        at 
org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory.lambda$static$0(ResourceMethodInvocationHandlerFactory.java:52)
 ~[org.glassfish.jersey.core-jersey-server-2.34.jar:?]
        at 
org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher$1.run(AbstractJavaResourceMethodDispatcher.java:124)
 ~[org.glassfish.jersey.core-jersey-server-2.34.jar:?]
        at 
org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:167)
 ~[org.glassfish.jersey.core-jersey-server-2.34.jar:?]
        at 
org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$VoidOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:159)
 ~[org.glassfish.jersey.core-jersey-server-2.34.jar:?]
        at 
org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:79)
 ~[org.glassfish.jersey.core-jersey-server-2.34.jar:?]
        at 
org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:475)
 ~[org.glassfish.jersey.core-jersey-server-2.34.jar:?]
        at 
org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:397)
 ~[org.glassfish.jersey.core-jersey-server-2.34.jar:?]
        at 
org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:81)
 ~[org.glassfish.jersey.core-jersey-server-2.34.jar:?]
        at 
org.glassfish.jersey.server.ServerRuntime$1.run(ServerRuntime.java:255) 
~[org.glassfish.jersey.core-jersey-server-2.34.jar:?]
        at org.glassfish.jersey.internal.Errors$1.call(Errors.java:248) 
~[org.glassfish.jersey.core-jersey-common-2.34.jar:?]
        at org.glassfish.jersey.internal.Errors$1.call(Errors.java:244) 
~[org.glassfish.jersey.core-jersey-common-2.34.jar:?]
        at org.glassfish.jersey.internal.Errors.process(Errors.java:292) 
~[org.glassfish.jersey.core-jersey-common-2.34.jar:?]
        at org.glassfish.jersey.internal.Errors.process(Errors.java:274) 
~[org.glassfish.jersey.core-jersey-common-2.34.jar:?]
        at org.glassfish.jersey.internal.Errors.process(Errors.java:244) 
~[org.glassfish.jersey.core-jersey-common-2.34.jar:?]
        at 
org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:265)
 ~[org.glassfish.jersey.core-jersey-common-2.34.jar:?]
        at 
org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:234) 
~[org.glassfish.jersey.core-jersey-server-2.34.jar:?]
        at 
org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:680)
 ~[org.glassfish.jersey.core-jersey-server-2.34.jar:?]
        at 
org.glassfish.jersey.servlet.WebComponent.serviceImpl(WebComponent.java:394) 
~[org.glassfish.jersey.containers-jersey-container-servlet-core-2.34.jar:?]
        at 
org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:346) 
~[org.glassfish.jersey.containers-jersey-container-servlet-core-2.34.jar:?]
        at 
org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:366)
 ~[org.glassfish.jersey.containers-jersey-container-servlet-core-2.34.jar:?]
        at 
org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:319)
 ~[org.glassfish.jersey.containers-jersey-container-servlet-core-2.34.jar:?]
        at 
org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:205)
 ~[org.glassfish.jersey.containers-jersey-container-servlet-core-2.34.jar:?]
        at 
org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:799) 
~[org.eclipse.jetty-jetty-servlet-9.4.43.v20210629.jar:9.4.43.v20210629]
        at 
org.eclipse.jetty.servlet.ServletHandler$ChainEnd.doFilter(ServletHandler.java:1626)
 ~[org.eclipse.jetty-jetty-servlet-9.4.43.v20210629.jar:9.4.43.v20210629]
        at 
org.apache.pulsar.broker.web.ResponseHandlerFilter.doFilter(ResponseHandlerFilter.java:67)
 ~[org.apache.pulsar-pulsar-broker-2.9.1.jar:2.9.1]
        at 
org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:193) 
~[org.eclipse.jetty-jetty-servlet-9.4.43.v20210629.jar:9.4.43.v20210629]
        at 
org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1601)
 ~[org.eclipse.jetty-jetty-servlet-9.4.43.v20210629.jar:9.4.43.v20210629]
        at 
org.apache.pulsar.broker.web.AuthenticationFilter.doFilter(AuthenticationFilter.java:84)
 ~[org.apache.pulsar-pulsar-broker-common-2.9.1.jar:2.9.1]
        at 
org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:193) 
~[org.eclipse.jetty-jetty-servlet-9.4.43.v20210629.jar:9.4.43.v20210629]
        at 
org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1601)
 ~[org.eclipse.jetty-jetty-servlet-9.4.43.v20210629.jar:9.4.43.v20210629]
        at 
org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:548) 
~[org.eclipse.jetty-jetty-servlet-9.4.43.v20210629.jar:9.4.43.v20210629]
        at 
org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:233)
 ~[org.eclipse.jetty-jetty-server-9.4.43.v20210629.jar:9.4.43.v20210629]
        at 
org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1624)
 ~[org.eclipse.jetty-jetty-server-9.4.43.v20210629.jar:9.4.43.v20210629]
        at 
org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:233)
 ~[org.eclipse.jetty-jetty-server-9.4.43.v20210629.jar:9.4.43.v20210629]
        at 
org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1434)
 ~[org.eclipse.jetty-jetty-server-9.4.43.v20210629.jar:9.4.43.v20210629]
        at 
org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:188)
 ~[org.eclipse.jetty-jetty-server-9.4.43.v20210629.jar:9.4.43.v20210629]
        at 
org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:501) 
~[org.eclipse.jetty-jetty-servlet-9.4.43.v20210629.jar:9.4.43.v20210629]
        at 
org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1594)
 ~[org.eclipse.jetty-jetty-server-9.4.43.v20210629.jar:9.4.43.v20210629]
        at 
org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:186)
 ~[org.eclipse.jetty-jetty-server-9.4.43.v20210629.jar:9.4.43.v20210629]
        at 
org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1349)
 ~[org.eclipse.jetty-jetty-server-9.4.43.v20210629.jar:9.4.43.v20210629]
        at 
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141) 
~[org.eclipse.jetty-jetty-server-9.4.43.v20210629.jar:9.4.43.v20210629]
        at 
org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:234)
 ~[org.eclipse.jetty-jetty-server-9.4.43.v20210629.jar:9.4.43.v20210629]
        at 
org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:146)
 ~[org.eclipse.jetty-jetty-server-9.4.43.v20210629.jar:9.4.43.v20210629]
        at 
org.eclipse.jetty.server.handler.StatisticsHandler.handle(StatisticsHandler.java:179)
 ~[org.eclipse.jetty-jetty-server-9.4.43.v20210629.jar:9.4.43.v20210629]
        at 
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127) 
~[org.eclipse.jetty-jetty-server-9.4.43.v20210629.jar:9.4.43.v20210629]
        at org.eclipse.jetty.server.Server.handle(Server.java:516) 
~[org.eclipse.jetty-jetty-server-9.4.43.v20210629.jar:9.4.43.v20210629]
        at 
org.eclipse.jetty.server.HttpChannel.lambda$handle$1(HttpChannel.java:388) 
~[org.eclipse.jetty-jetty-server-9.4.43.v20210629.jar:9.4.43.v20210629]
        at org.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:633) 
[org.eclipse.jetty-jetty-server-9.4.43.v20210629.jar:9.4.43.v20210629]
        at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:380) 
[org.eclipse.jetty-jetty-server-9.4.43.v20210629.jar:9.4.43.v20210629]
        at 
org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:277) 
[org.eclipse.jetty-jetty-server-9.4.43.v20210629.jar:9.4.43.v20210629]
        at 
org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:311)
 [org.eclipse.jetty-jetty-io-9.4.43.v20210629.jar:9.4.43.v20210629]
        at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:105) 
[org.eclipse.jetty-jetty-io-9.4.43.v20210629.jar:9.4.43.v20210629]
        at org.eclipse.jetty.io.ChannelEndPoint$1.run(ChannelEndPoint.java:104) 
[org.eclipse.jetty-jetty-io-9.4.43.v20210629.jar:9.4.43.v20210629]
        at 
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:338)
 [org.eclipse.jetty-jetty-util-9.4.43.v20210629.jar:9.4.43.v20210629]
        at 
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:315)
 [org.eclipse.jetty-jetty-util-9.4.43.v20210629.jar:9.4.43.v20210629]
        at 
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:173)
 [org.eclipse.jetty-jetty-util-9.4.43.v20210629.jar:9.4.43.v20210629]
        at 
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:131)
 [org.eclipse.jetty-jetty-util-9.4.43.v20210629.jar:9.4.43.v20210629]
        at 
org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:386)
 [org.eclipse.jetty-jetty-util-9.4.43.v20210629.jar:9.4.43.v20210629]
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) 
[?:?]
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) 
[?:?]
        at 
io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
 [io.netty-netty-common-4.1.72.Final.jar:4.1.72.Final]
        at java.lang.Thread.run(Thread.java:829) [?:?]
   Caused by: java.util.concurrent.TimeoutException
        at 
java.util.concurrent.CompletableFuture.timedGet(CompletableFuture.java:1886) 
~[?:?]
        at 
java.util.concurrent.CompletableFuture.get(CompletableFuture.java:2021) ~[?:?]
        at 
org.apache.pulsar.broker.resources.BaseResources.set(BaseResources.java:101) 
~[org.apache.pulsar-pulsar-broker-common-2.9.1.jar:2.9.1]
        ... 70 more
        
   # Causes all consumers/producers throw timeout exceptions.
   level:WARN
   logger:org.apache.pulsar.broker.service.Producer
   thread:metadata-store-6-1
   time:2022-02-08T06:27:13,550+0000
   message:- [xxxx] Get unexpected error while autorizing 
[persistent://biz/xxx/xxxx-partition-1]  null
   java.util.concurrent.TimeoutException: null
        at 
java.util.concurrent.CompletableFuture.timedGet(CompletableFuture.java:1886) 
~[?:?]
        at 
java.util.concurrent.CompletableFuture.get(CompletableFuture.java:2021) ~[?:?]
        at 
org.apache.pulsar.broker.authorization.AuthorizationService.canProduce(AuthorizationService.java:230)
 ~[org.apache.pulsar-pulsar-broker-common-2.9.1.jar:2.9.1]
        at 
org.apache.pulsar.broker.service.Producer.checkPermissions(Producer.java:654) 
~[org.apache.pulsar-pulsar-broker-2.9.1.jar:2.9.1]
        at 
org.apache.pulsar.broker.service.persistent.PersistentTopic.lambda$onPoliciesUpdate$106(PersistentTopic.java:2419)
 ~[org.apache.pulsar-pulsar-broker-2.9.1.jar:2.9.1]
        at 
java.util.concurrent.ConcurrentHashMap$ValuesView.forEach(ConcurrentHashMap.java:4772)
 ~[?:?]
        at 
org.apache.pulsar.broker.service.persistent.PersistentTopic.onPoliciesUpdate(PersistentTopic.java:2418)
 ~[org.apache.pulsar-pulsar-broker-2.9.1.jar:2.9.1]
        at 
org.apache.pulsar.broker.service.BrokerService.lambda$null$84(BrokerService.java:1830)
 ~[org.apache.pulsar-pulsar-broker-2.9.1.jar:2.9.1]
        at java.util.Optional.ifPresent(Optional.java:183) ~[?:?]
        at 
org.apache.pulsar.broker.service.BrokerService.lambda$null$85(BrokerService.java:1830)
 ~[org.apache.pulsar-pulsar-broker-2.9.1.jar:2.9.1]
        at 
java.util.concurrent.CompletableFuture.uniAcceptNow(CompletableFuture.java:753) 
~[?:?]
        at 
java.util.concurrent.CompletableFuture.uniAcceptStage(CompletableFuture.java:731)
 ~[?:?]
        at 
java.util.concurrent.CompletableFuture.thenAccept(CompletableFuture.java:2108) 
~[?:?]
        at 
org.apache.pulsar.broker.service.BrokerService.lambda$null$86(BrokerService.java:1825)
 ~[org.apache.pulsar-pulsar-broker-2.9.1.jar:2.9.1]
        at 
org.apache.pulsar.common.util.collections.ConcurrentOpenHashMap$Section.forEach(ConcurrentOpenHashMap.java:387)
 ~[org.apache.pulsar-pulsar-common-2.9.1.jar:2.9.1]
        at 
org.apache.pulsar.common.util.collections.ConcurrentOpenHashMap.forEach(ConcurrentOpenHashMap.java:159)
 ~[org.apache.pulsar-pulsar-common-2.9.1.jar:2.9.1]
        at 
org.apache.pulsar.broker.service.BrokerService.lambda$handlePoliciesUpdates$87(BrokerService.java:1821)
 ~[org.apache.pulsar-pulsar-broker-2.9.1.jar:2.9.1]
        at 
java.util.concurrent.CompletableFuture$UniAccept.tryFire(CompletableFuture.java:714)
 ~[?:?]
        at 
java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:506) 
~[?:?]
        at 
java.util.concurrent.CompletableFuture.complete(CompletableFuture.java:2073) 
~[?:?]
        at 
org.apache.pulsar.metadata.impl.ZKMetadataStore.lambda$null$7(ZKMetadataStore.java:139)
 ~[org.apache.pulsar-pulsar-metadata-2.9.1.jar:2.9.1]
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) 
[?:?]
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) 
[?:?]
        at 
io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
 [io.netty-netty-common-4.1.72.Final.jar:4.1.72.Final]
        at java.lang.Thread.run(Thread.java:829) [?:?]
   
   # After 5 
minutes(org.apache.pulsar.metadata.cache.impl.MetadataCacheImpl#CACHE_REFRESH_TIME_MILLIS),
 all cache expired and zk callback still stuck.
   level:ERROR
   logger:rg.apache.bookkeeper.mledger.impl.ManagedLedgerImpl
   thread:BookKeeperClientWorker-OrderedExecutor-2-0
   time:2022-02-08T06:33:24,517+0000
   message:- [xxx/xxx/xxx/xxxx-partition-0] Error creating ledger rc=-23 Bookie 
operation timeout
   ```
   
   Jstack
   ```
   "metadata-store-6-1" Id=58 TIMED_WAITING on 
java.util.concurrent.CompletableFuture$Signaller@571e7c01
       at [email protected]/jdk.internal.misc.Unsafe.park(Native Method)
       -  waiting on java.util.concurrent.CompletableFuture$Signaller@571e7c01
       at 
[email protected]/java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:234)
       at 
[email protected]/java.util.concurrent.CompletableFuture$Signaller.block(CompletableFuture.java:1798)
       at 
[email protected]/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3128)
       at 
[email protected]/java.util.concurrent.CompletableFuture.timedGet(CompletableFuture.java:1868)
       at 
[email protected]/java.util.concurrent.CompletableFuture.get(CompletableFuture.java:2021)
       at 
app//org.apache.pulsar.broker.authorization.AuthorizationService.canProduce(AuthorizationService.java:230)
       at 
app//org.apache.pulsar.broker.service.Producer.checkPermissions(Producer.java:654)
       at 
app//org.apache.pulsar.broker.service.persistent.PersistentTopic.lambda$onPoliciesUpdate$106(PersistentTopic.java:2419)
       at 
app//org.apache.pulsar.broker.service.persistent.PersistentTopic$$Lambda$1298/0x000000084081dc40.accept(Unknown
 Source)
       at 
[email protected]/java.util.concurrent.ConcurrentHashMap$ValuesView.forEach(ConcurrentHashMap.java:4772)
       at 
app//org.apache.pulsar.broker.service.persistent.PersistentTopic.onPoliciesUpdate(PersistentTopic.java:2418)
       at 
app//org.apache.pulsar.broker.service.BrokerService.lambda$null$84(BrokerService.java:1830)
       at 
app//org.apache.pulsar.broker.service.BrokerService$$Lambda$1297/0x000000084081d840.accept(Unknown
 Source)
       at [email protected]/java.util.Optional.ifPresent(Optional.java:183)
       at 
app//org.apache.pulsar.broker.service.BrokerService.lambda$null$85(BrokerService.java:1830)
       at 
app//org.apache.pulsar.broker.service.BrokerService$$Lambda$1296/0x000000084081d440.accept(Unknown
 Source)
       at 
[email protected]/java.util.concurrent.CompletableFuture.uniAcceptNow(CompletableFuture.java:753)
       at 
[email protected]/java.util.concurrent.CompletableFuture.uniAcceptStage(CompletableFuture.java:731)
       at 
[email protected]/java.util.concurrent.CompletableFuture.thenAccept(CompletableFuture.java:2108)
       at 
app//org.apache.pulsar.broker.service.BrokerService.lambda$null$86(BrokerService.java:1825)
       at 
app//org.apache.pulsar.broker.service.BrokerService$$Lambda$1295/0x000000084081d040.accept(Unknown
 Source)
       at 
app//org.apache.pulsar.common.util.collections.ConcurrentOpenHashMap$Section.forEach(ConcurrentOpenHashMap.java:387)
       at 
app//org.apache.pulsar.common.util.collections.ConcurrentOpenHashMap.forEach(ConcurrentOpenHashMap.java:159)
       at 
app//org.apache.pulsar.broker.service.BrokerService.lambda$handlePoliciesUpdates$87(BrokerService.java:1821)
       at 
app//org.apache.pulsar.broker.service.BrokerService$$Lambda$1294/0x000000084081cc40.accept(Unknown
 Source)
       at 
[email protected]/java.util.concurrent.CompletableFuture$UniAccept.tryFire(CompletableFuture.java:714)
       at 
[email protected]/java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:506)
       at 
[email protected]/java.util.concurrent.CompletableFuture.complete(CompletableFuture.java:2073)
       at 
app//org.apache.pulsar.metadata.impl.ZKMetadataStore.lambda$null$7(ZKMetadataStore.java:139)
       at 
app//org.apache.pulsar.metadata.impl.ZKMetadataStore$$Lambda$196/0x000000084033c440.run(Unknown
 Source)
       at 
[email protected]/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
       at 
[email protected]/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
       at 
app//io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
       at [email protected]/java.lang.Thread.run(Thread.java:829)
   ```
   
   ### Modifications
   
   add new ThreadPoolExecutor for listener


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