soullkk opened a new issue, #14242: URL: https://github.com/apache/druid/issues/14242
Broker errors when **handshake with** historical or indexer 2023-04-02 04:35:24,831 WARN [qtp1319386445-190[groupBy_[xxxx]_7a5c4d33-5a19-41d3-b39c-0d1f4458e68c]][][org.apache.druid.java.util.http.client.NettyHttpClient] **Netty faulty channel failed!!!** org.jboss.netty.channel.ChannelException: Failed to handshake with host[https://x.x.x.x:26204] at org.apache.druid.java.util.http.client.pool.ChannelResourceFactory$2$1.operationComplete(ChannelResourceFactory.java:157) ~[druid-core-0.21.1-h0.gdd.sop.r49.jar:?] at org.jboss.netty.channel.DefaultChannelFuture.notifyListener(DefaultChannelFuture.java:409) ~[netty-3.10.6.Final.jar:?] at org.jboss.netty.channel.DefaultChannelFuture.notifyListeners(DefaultChannelFuture.java:395) ~[netty-3.10.6.Final.jar:?] at org.jboss.netty.channel.DefaultChannelFuture.setFailure(DefaultChannelFuture.java:362) ~[netty-3.10.6.Final.jar:?] at org.jboss.netty.handler.ssl.SslHandler.setHandshakeFailure(SslHandler.java:1461) ~[netty-3.10.6.Final.jar:?] at org.jboss.netty.handler.ssl.SslHandler.access$200(SslHandler.java:180) ~[netty-3.10.6.Final.jar:?] at org.jboss.netty.handler.ssl.SslHandler$1.run(SslHandler.java:372) ~[netty-3.10.6.Final.jar:?] at org.jboss.netty.util.HashedWheelTimer$HashedWheelTimeout.expire(HashedWheelTimer.java:556) ~[netty-3.10.6.Final.jar:?] at org.jboss.netty.util.HashedWheelTimer$HashedWheelBucket.expireTimeouts(HashedWheelTimer.java:632) ~[netty-3.10.6.Final.jar:?] at org.jboss.netty.util.HashedWheelTimer$Worker.run(HashedWheelTimer.java:369) ~[netty-3.10.6.Final.jar:?] at org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108) ~[netty-3.10.6.Final.jar:?] at java.lang.Thread.run(Thread.java:750) ~[?:1.8.0_362] Caused by: javax.net.ssl.SSLException: Handshake did not complete within 10000ms ... 6 more 2023-04-02 04:35:24,875 WARN [ForkJoinPool-1-worker-14][][org.apache.druid.client.JsonParserIterator] Query [7a5c4d33-5a19-41d3-b39c-0d1f4458e68c] to host [x.x.x.x:26204] interrupted org.jboss.netty.channel.ChannelException: Faulty channel in resource pool at org.apache.druid.java.util.http.client.NettyHttpClient.go(NettyHttpClient.java:132) ~[druid-core-0.21.1-h0.gdd.sop.r49.jar:?] at org.apache.druid.client.DirectDruidClient.run(DirectDruidClient.java:462) ~[druid-server-0.21.1-h0.gdd.sop.r49.jar:?] at org.apache.druid.client.CachingClusteredClient$SpecificQueryRunnable.getSimpleServerResults(CachingClusteredClient.java:723) ~[druid-server-0.21.1-h0.gdd.sop.r49.jar:?] at org.apache.druid.client.CachingClusteredClient$SpecificQueryRunnable.lambda$addSequencesFromServer$9(CachingClusteredClient.java:685) ~[druid-server-0.21.1-h0.gdd.sop.r49.jar:?] at java.util.TreeMap.forEach(TreeMap.java:1005) ~[?:1.8.0_362] at org.apache.druid.client.CachingClusteredClient$SpecificQueryRunnable.addSequencesFromServer(CachingClusteredClient.java:669) ~[druid-server-0.21.1-h0.gdd.sop.r49.jar:?] at org.apache.druid.client.CachingClusteredClient$SpecificQueryRunnable.lambda$run$2(CachingClusteredClient.java:397) ~[druid-server-0.21.1-h0.gdd.sop.r49.jar:?] at org.apache.druid.java.util.common.guava.LazySequence.toYielder(LazySequence.java:46) ~[druid-core-0.21.1-h0.gdd.sop.r49.jar:?] at org.apache.druid.java.util.common.guava.WrappingSequence$2.get(WrappingSequence.java:88) ~[druid-core-0.21.1-h0.gdd.sop.r49.jar:?] at org.apache.druid.java.util.common.guava.WrappingSequence$2.get(WrappingSequence.java:84) ~[druid-core-0.21.1-h0.gdd.sop.r49.jar:?] at org.apache.druid.java.util.common.guava.SequenceWrapper.wrap(SequenceWrapper.java:55) ~[druid-core-0.21.1-h0.gdd.sop.r49.jar:?] at org.apache.druid.java.util.common.guava.WrappingSequence.toYielder(WrappingSequence.java:83) ~[druid-core-0.21.1-h0.gdd.sop.r49.jar:?] at org.apache.druid.java.util.common.guava.MergeSequence.lambda$toYielder$1(MergeSequence.java:65) ~[druid-core-0.21.1-h0.gdd.sop.r49.jar:?] at org.apache.druid.java.util.common.guava.BaseSequence.accumulate(BaseSequence.java:44) ~[druid-core-0.21.1-h0.gdd.sop.r49.jar:?] at org.apache.druid.java.util.common.guava.MergeSequence.toYielder(MergeSequence.java:62) ~[druid-core-0.21.1-h0.gdd.sop.r49.jar:?] at org.apache.druid.query.RetryQueryRunner$1.toYielder(RetryQueryRunner.java:134) ~[druid-server-0.21.1-h0.gdd.sop.r49.jar:?] at org.apache.druid.common.guava.CombiningSequence.toYielder(CombiningSequence.java:78) ~[druid-core-0.21.1-h0.gdd.sop.r49.jar:?] at org.apache.druid.java.util.common.guava.WrappingSequence$2.get(WrappingSequence.java:88) ~[druid-core-0.21.1-h0.gdd.sop.r49.jar:?] at org.apache.druid.java.util.common.guava.WrappingSequence$2.get(WrappingSequence.java:84) ~[druid-core-0.21.1-h0.gdd.sop.r49.jar:?] at org.apache.druid.java.util.common.guava.SequenceWrapper.wrap(SequenceWrapper.java:55) ~[druid-core-0.21.1-h0.gdd.sop.r49.jar:?] at org.apache.druid.java.util.common.guava.WrappingSequence.toYielder(WrappingSequence.java:83) ~[druid-core-0.21.1-h0.gdd.sop.r49.jar:?] at org.apache.druid.java.util.common.guava.MappedSequence.toYielder(MappedSequence.java:49) ~[druid-core-0.21.1-h0.gdd.sop.r49.jar:?] at org.apache.druid.java.util.common.guava.WrappingSequence$2.get(WrappingSequence.java:88) ~[druid-core-0.21.1-h0.gdd.sop.r49.jar:?] at org.apache.druid.java.util.common.guava.WrappingSequence$2.get(WrappingSequence.java:84) ~[druid-core-0.21.1-h0.gdd.sop.r49.jar:?] at org.apache.druid.query.CPUTimeMetricQueryRunner$1.wrap(CPUTimeMetricQueryRunner.java:78) ~[druid-processing-0.21.1-h0.gdd.sop.r49.jar:?] at org.apache.druid.java.util.common.guava.WrappingSequence.toYielder(WrappingSequence.java:83) ~[druid-core-0.21.1-h0.gdd.sop.r49.jar:?] at org.apache.druid.java.util.common.guava.Yielders.each(Yielders.java:32) ~[druid-core-0.21.1-h0.gdd.sop.r49.jar:?] at org.apache.druid.server.QueryResource.doPost(QueryResource.java:230) ~[druid-server-0.21.1-h0.gdd.sop.r49.jar:?] at sun.reflect.GeneratedMethodAccessor115.invoke(Unknown Source) ~[?:?] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_362] at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_362] at com.sun.jersey.spi.container.JavaMethodInvokerFactory$1.invoke(JavaMethodInvokerFactory.java:60) ~[jersey-server-1.19.3.jar:1.19.3] at com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$ResponseOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:205) ~[jersey-server-1.19.3.jar:1.19.3] at com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75) ~[jersey-server-1.19.3.jar:1.19.3] at com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:302) ~[jersey-server-1.19.3.jar:1.19.3] at com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108) ~[jersey-server-1.19.3.jar:1.19.3] at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147) ~[jersey-server-1.19.3.jar:1.19.3] at com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84) ~[jersey-server-1.19.3.jar:1.19.3] at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1542) ~[jersey-server-1.19.3.jar:1.19.3] at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1473) ~[jersey-server-1.19.3.jar:1.19.3] at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1419) ~[jersey-server-1.19.3.jar:1.19.3] at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1409) ~[jersey-server-1.19.3.jar:1.19.3] at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:409) ~[jersey-servlet-1.19.3.jar:1.19.3] at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:558) ~[jersey-servlet-1.19.3.jar:1.19.3] at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:733) ~[jersey-servlet-1.19.3.jar:1.19.3] at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) ~[javax.servlet-api-3.1.0.jar:3.1.0] at com.google.inject.servlet.ServletDefinition.doServiceImpl(ServletDefinition.java:286) ~[guice-servlet-4.1.0.jar:?] at com.google.inject.servlet.ServletDefinition.doService(ServletDefinition.java:276) ~[guice-servlet-4.1.0.jar:?] at com.google.inject.servlet.ServletDefinition.service(ServletDefinition.java:181) ~[guice-servlet-4.1.0.jar:?] at com.google.inject.servlet.ManagedServletPipeline.service(ManagedServletPipeline.java:91) ~[guice-servlet-4.1.0.jar:?] at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:85) ~[guice-servlet-4.1.0.jar:?] at com.google.inject.servlet.ManagedFilterPipeline.dispatch(ManagedFilterPipeline.java:120) ~[guice-servlet-4.1.0.jar:?] at com.google.inject.servlet.GuiceFilter.doFilter(GuiceFilter.java:135) ~[guice-servlet-4.1.0.jar:?] at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:193) ~[jetty-servlet-9.4.48.v20220622.jar:9.4.48.v20220622] at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1626) ~[jetty-servlet-9.4.48.v20220622.jar:9.4.48.v20220622] at org.apache.druid.server.security.PreResponseAuthorizationCheckFilter.doFilter(PreResponseAuthorizationCheckFilter.java:82) ~[druid-server-0.21.1-h0.gdd.sop.r49.jar:?] at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:193) ~[jetty-servlet-9.4.48.v20220622.jar:9.4.48.v20220622] at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1626) ~[jetty-servlet-9.4.48.v20220622.jar:9.4.48.v20220622] at org.apache.druid.server.security.AllowHttpMethodsResourceFilter.doFilter(AllowHttpMethodsResourceFilter.java:78) ~[druid-server-0.21.1-h0.gdd.sop.r49.jar:?] at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:193) ~[jetty-servlet-9.4.48.v20220622.jar:9.4.48.v20220622] at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1626) ~[jetty-servlet-9.4.48.v20220622.jar:9.4.48.v20220622] at org.apache.druid.server.security.AllowOptionsResourceFilter.doFilter(AllowOptionsResourceFilter.java:75) ~[druid-server-0.21.1-h0.gdd.sop.r49.jar:?] at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:193) ~[jetty-servlet-9.4.48.v20220622.jar:9.4.48.v20220622] at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1626) ~[jetty-servlet-9.4.48.v20220622.jar:9.4.48.v20220622] at org.apache.druid.server.security.AllowAllAuthenticator$1.doFilter(AllowAllAuthenticator.java:84) ~[druid-server-0.21.1-h0.gdd.sop.r49.jar:?] at org.apache.druid.server.security.AuthenticationWrappingFilter.doFilter(AuthenticationWrappingFilter.java:59) ~[druid-server-0.21.1-h0.gdd.sop.r49.jar:?] at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:193) ~[jetty-servlet-9.4.48.v20220622.jar:9.4.48.v20220622] at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1626) ~[jetty-servlet-9.4.48.v20220622.jar:9.4.48.v20220622] at org.apache.druid.server.security.SecuritySanityCheckFilter.doFilter(SecuritySanityCheckFilter.java:77) ~[druid-server-0.21.1-h0.gdd.sop.r49.jar:?] at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:193) ~[jetty-servlet-9.4.48.v20220622.jar:9.4.48.v20220622] at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1626) ~[jetty-servlet-9.4.48.v20220622.jar:9.4.48.v20220622] at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:552) ~[jetty-servlet-9.4.48.v20220622.jar:9.4.48.v20220622] at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:233) ~[jetty-server-9.4.48.v20220622.jar:9.4.48.v20220622] at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1624) ~[jetty-server-9.4.48.v20220622.jar:9.4.48.v20220622] at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:233) ~[jetty-server-9.4.48.v20220622.jar:9.4.48.v20220622] at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1440) ~[jetty-server-9.4.48.v20220622.jar:9.4.48.v20220622] at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:188) ~[jetty-server-9.4.48.v20220622.jar:9.4.48.v20220622] at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:505) ~[jetty-servlet-9.4.48.v20220622.jar:9.4.48.v20220622] at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1594) ~[jetty-server-9.4.48.v20220622.jar:9.4.48.v20220622] at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:186) ~[jetty-server-9.4.48.v20220622.jar:9.4.48.v20220622] at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1355) ~[jetty-server-9.4.48.v20220622.jar:9.4.48.v20220622] at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141) ~[jetty-server-9.4.48.v20220622.jar:9.4.48.v20220622] at org.eclipse.jetty.server.handler.gzip.GzipHandler.handle(GzipHandler.java:772) ~[jetty-server-9.4.48.v20220622.jar:9.4.48.v20220622] at org.eclipse.jetty.server.handler.HandlerList.handle(HandlerList.java:59) ~[jetty-server-9.4.48.v20220622.jar:9.4.48.v20220622] at org.eclipse.jetty.server.handler.StatisticsHandler.handle(StatisticsHandler.java:181) ~[jetty-server-9.4.48.v20220622.jar:9.4.48.v20220622] at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127) ~[jetty-server-9.4.48.v20220622.jar:9.4.48.v20220622] at org.eclipse.jetty.server.Server.handle(Server.java:516) ~[jetty-server-9.4.48.v20220622.jar:9.4.48.v20220622] at org.eclipse.jetty.server.HttpChannel.lambda$handle$1(HttpChannel.java:487) ~[jetty-server-9.4.48.v20220622.jar:9.4.48.v20220622] at org.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:732) ~[jetty-server-9.4.48.v20220622.jar:9.4.48.v20220622] at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:479) ~[jetty-server-9.4.48.v20220622.jar:9.4.48.v20220622] at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:277) ~[jetty-server-9.4.48.v20220622.jar:9.4.48.v20220622] at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:311) ~[jetty-io-9.4.48.v20220622.jar:9.4.48.v20220622] at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:105) ~[jetty-io-9.4.48.v20220622.jar:9.4.48.v20220622] at org.eclipse.jetty.io.ssl.SslConnection$DecryptedEndPoint.onFillable(SslConnection.java:555) ~[jetty-io-9.4.48.v20220622.jar:9.4.48.v20220622] at org.eclipse.jetty.io.ssl.SslConnection.onFillable(SslConnection.java:410) ~[jetty-io-9.4.48.v20220622.jar:9.4.48.v20220622] at org.eclipse.jetty.io.ssl.SslConnection$2.succeeded(SslConnection.java:164) ~[jetty-io-9.4.48.v20220622.jar:9.4.48.v20220622] at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:105) ~[jetty-io-9.4.48.v20220622.jar:9.4.48.v20220622] at org.eclipse.jetty.io.ChannelEndPoint$1.run(ChannelEndPoint.java:104) ~[jetty-io-9.4.48.v20220622.jar:9.4.48.v20220622] at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:338) ~[jetty-util-9.4.48.v20220622.jar:9.4.48.v20220622] at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:315) ~[jetty-util-9.4.48.v20220622.jar:9.4.48.v20220622] at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:173) ~[jetty-util-9.4.48.v20220622.jar:9.4.48.v20220622] at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:131) ~[jetty-util-9.4.48.v20220622.jar:9.4.48.v20220622] at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:409) ~[jetty-util-9.4.48.v20220622.jar:9.4.48.v20220622] at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:883) ~[jetty-util-9.4.48.v20220622.jar:9.4.48.v20220622] at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:1034) ~[jetty-util-9.4.48.v20220622.jar:9.4.48.v20220622] at java.lang.Thread.run(Thread.java:750) ~[?:1.8.0_362] Caused by: org.jboss.netty.channel.ChannelException: **Failed to handshake with host[https://x.x.x.x:26204]** at org.apache.druid.java.util.http.client.pool.ChannelResourceFactory$2$1.operationComplete(ChannelResourceFactory.java:157) ~[druid-core-0.21.1-h0.gdd.sop.r49.jar:?] at org.jboss.netty.channel.DefaultChannelFuture.notifyListener(DefaultChannelFuture.java:409) ~[netty-3.10.6.Final.jar:?] at org.jboss.netty.channel.DefaultChannelFuture.notifyListeners(DefaultChannelFuture.java:395) ~[netty-3.10.6.Final.jar:?] at org.jboss.netty.channel.DefaultChannelFuture.setFailure(DefaultChannelFuture.java:362) ~[netty-3.10.6.Final.jar:?] at org.jboss.netty.handler.ssl.SslHandler.setHandshakeFailure(SslHandler.java:1461) ~[netty-3.10.6.Final.jar:?] at org.jboss.netty.handler.ssl.SslHandler.access$200(SslHandler.java:180) ~[netty-3.10.6.Final.jar:?] at org.jboss.netty.handler.ssl.SslHandler$1.run(SslHandler.java:372) ~[netty-3.10.6.Final.jar:?] at org.jboss.netty.util.HashedWheelTimer$HashedWheelTimeout.expire(HashedWheelTimer.java:556) ~[netty-3.10.6.Final.jar:?] at org.jboss.netty.util.HashedWheelTimer$HashedWheelBucket.expireTimeouts(HashedWheelTimer.java:632) ~[netty-3.10.6.Final.jar:?] at org.jboss.netty.util.HashedWheelTimer$Worker.run(HashedWheelTimer.java:369) ~[netty-3.10.6.Final.jar:?] at org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108) ~[netty-3.10.6.Final.jar:?] ... 1 more Caused by: javax.net.ssl.SSLException: **Handshake did not complete within 10000ms** at org.jboss.netty.handler.ssl.SslHandler$1.run(SslHandler.java:372) ~[netty-3.10.6.Final.jar:?] at org.jboss.netty.util.HashedWheelTimer$HashedWheelTimeout.expire(HashedWheelTimer.java:556) ~[netty-3.10.6.Final.jar:?] at org.jboss.netty.util.HashedWheelTimer$HashedWheelBucket.expireTimeouts(HashedWheelTimer.java:632) ~[netty-3.10.6.Final.jar:?] at org.jboss.netty.util.HashedWheelTimer$Worker.run(HashedWheelTimer.java:369) ~[netty-3.10.6.Final.jar:?] at org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108) ~[netty-3.10.6.Final.jar:?] ### Affected Version druid 0.21 version ### Description Please include as much detailed information about the problem as possible. - total 7 nodes in cluster This exception occurs frequently. I found that the exception occurred in the SslHandler.handshake() when the ChannelFuture is null or not done. The source code in netty is as follows： try { engine.beginHandshake(); runDelegatedTasks(); handshakeFuture = this.handshakeFuture = future(channel); if (handshakeTimeoutInMillis > 0) { handshakeTimeout = timer.newTimeout(new TimerTask() { public void run(Timeout timeout) throws Exception { ChannelFuture future = SslHandler.this.handshakeFuture; if (future != null && future.isDone()) { return; } setHandshakeFailure(channel, new SSLException("Handshake did not complete within " + handshakeTimeoutInMillis + "ms")); } }, handshakeTimeoutInMillis, TimeUnit.MILLISECONDS); } } catch (Exception e) { handshakeFuture = this.handshakeFuture = failedFuture(channel, e); exception = e; } I checked the server's configuration for druid. server. http. numThreads as follows： overlord=50 coordinator=50 indexer=25 historical=25 broker=12 When there is a exception connecting to other nodes(coodinator,historical,overlord,indexer), the metric of "jetty/numOpenConnections" are as follows: {"feed":"metrics","timestamp":"2023-05-05T10:00:26.959Z","service":"druid/coordinator","host":"x.x.x.x:26200","version":"","metric":"jetty/numOpenConnections","value":141} {"feed":"metrics","timestamp":"2023-05-06T10:12:44.278Z","service":"druid/historical","host":"x.x.x.x:26202","version":"","metric":"jetty/numOpenConnections","value":49} {"feed":"metrics","timestamp":"2023-05-06T12:26:32.252Z","service":"druid/overlord","host":"x.x.x.x:26203","version":"","metric":"jetty/numOpenConnections","value":158} {"feed":"metrics","timestamp":"2023-05-06T18:10:34.614Z","service":"druid/indexer","host":"x.x.x.x:26204","version":"","metric":"jetty/numOpenConnections","value":44} -- This is an automated message from the Apache Git Service. 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