devinbost commented on issue #6332: (Flaky-test) Intermittent failure of ProxyParserTest.testRegexSubscription URL: https://github.com/apache/pulsar/issues/6332#issuecomment-590554046 Here's the chain of events in the logs during the success-case around when the problem occurs: ``` 20:49:21.322 [pulsar-client-io-5029-1:org.apache.pulsar.client.impl.ConsumerImpl@550] INFO org.apache.pulsar.client.impl.ConsumerImpl - [persistent://sample/test/local/topic2][ignored] Subscribing to topic on cnx [id: 0x6b207b92, L:/10.1.0.4:38008 - R:fv-az59.sa2tkz14bfaudpy2zzhb034ywc.cx.internal.cloudapp.net/10.1.0.4:34623] 20:49:21.322 [pulsar-proxy-io-39-1:org.apache.pulsar.proxy.server.ParserProxyHandler@78] INFO org.apache.pulsar.proxy.server.ParserProxyHandler - frontendconn:[/10.1.0.4:38008/10.1.0.4:34623] cmd:SUBSCRIBE msg:{consumer:0486d,topic:persistent://sample/test/local/topic2} 20:49:21.323 [pulsar-io-15-4:org.apache.pulsar.broker.service.ServerCnx@760] INFO org.apache.pulsar.broker.service.ServerCnx - [/127.0.0.1:51438] Subscribing on topic persistent://sample/test/local/topic2 / ignored ``` Here's what it looks like in the failure case: ``` 20:49:21.343 [pulsar-client-io-5029-1:org.apache.pulsar.client.impl.ConsumerImpl@550] INFO org.apache.pulsar.client.impl.ConsumerImpl - [persistent://sample/test/local/topic1][regex-sub-proxy-parser-test-1582577361325] Subscribing to topic on cnx [id: 0x604df1da, L:/10.1.0.4:38026 - R:fv-az59.sa2tkz14bfaudpy2zzhb034ywc.cx.internal.cloudapp.net/10.1.0.4:34623] 20:49:21.343 [pulsar-proxy-io-39-1:io.netty.channel.DefaultChannelPipeline@1164] WARN io.netty.channel.DefaultChannelPipeline - An exceptionCaught() event was fired, and it reached at the tail of the pipeline. It usually means the last handler in the pipeline did not handle the exception. java.lang.UnsupportedOperationException: null ```
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