wolfstudy commented on issue #30: Talk about `grabcnx` logic URL: https://github.com/apache/pulsar-client-go/issues/30#issuecomment-521500765 ``` 11:27:31.826 [BookKeeperClientWorker-OrderedExecutor-1-0] INFO org.apache.pulsar.broker.service.ServerCnx - [/127.0.0.1:49977] [persistent://public/default/testSeek][sub-testSeek] Reset subscription to message id 0:4 11:27:31.822 [pulsar-io-35-2] WARN org.apache.pulsar.broker.service.ServerCnx - [/127.0.0.1:49977][persistent://public/default/testSeek][sub-testSeek] Failed to create consumer: Subscription is fenced java.util.concurrent.CompletionException: org.apache.pulsar.broker.service.BrokerServiceException$SubscriptionFencedException: Subscription is fenced at java.util.concurrent.CompletableFuture.encodeRelay(CompletableFuture.java:326) ~[?:1.8.0_201] at java.util.concurrent.CompletableFuture.uniComposeStage(CompletableFuture.java:984) ~[?:1.8.0_201] at java.util.concurrent.CompletableFuture.thenCompose(CompletableFuture.java:2124) ~[?:1.8.0_201] at org.apache.pulsar.broker.service.ServerCnx.lambda$null$13(ServerCnx.java:680) ~[org.apache.pulsar-pulsar-broker-2.4.0.jar:2.4.0] at java.util.concurrent.CompletableFuture.uniApply(CompletableFuture.java:602) ~[?:1.8.0_201] at java.util.concurrent.CompletableFuture.uniApplyStage(CompletableFuture.java:614) ~[?:1.8.0_201] at java.util.concurrent.CompletableFuture.thenApply(CompletableFuture.java:1983) ~[?:1.8.0_201] at org.apache.pulsar.broker.service.ServerCnx.lambda$handleSubscribe$15(ServerCnx.java:633) ~[org.apache.pulsar-pulsar-broker-2.4.0.jar:2.4.0] at java.util.concurrent.CompletableFuture.uniApply(CompletableFuture.java:602) [?:1.8.0_201] at java.util.concurrent.CompletableFuture.uniApplyStage(CompletableFuture.java:614) [?:1.8.0_201] at java.util.concurrent.CompletableFuture.thenApply(CompletableFuture.java:1983) [?:1.8.0_201] at org.apache.pulsar.broker.service.ServerCnx.handleSubscribe(ServerCnx.java:622) [org.apache.pulsar-pulsar-broker-2.4.0.jar:2.4.0] at org.apache.pulsar.common.protocol.PulsarDecoder.channelRead(PulsarDecoder.java:199) [org.apache.pulsar-pulsar-common-2.4.0.jar:2.4.0] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) [io.netty-netty-all-4.1.32.Final.jar:4.1.32.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) [io.netty-netty-all-4.1.32.Final.jar:4.1.32.Final] at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) [io.netty-netty-all-4.1.32.Final.jar:4.1.32.Final] at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:323) [io.netty-netty-all-4.1.32.Final.jar:4.1.32.Final] at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:297) [io.netty-netty-all-4.1.32.Final.jar:4.1.32.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) [io.netty-netty-all-4.1.32.Final.jar:4.1.32.Final] ```
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