liudezhi2098 opened a new issue #6388: when sending a message, set duplicate key to properties, can't pull the message while concumer URL: https://github.com/apache/pulsar/issues/6388 **Describe the bug** when sending a message, set duplicate key to properties, can't pull the message while concumer， and it can’t be consumed anymore **To Reproduce** _producer client_ ```java producer.newMessage().value("Hello") .property("TagA", "taga") .property("TagA", "tagb") .send() ```` _consumer client_ ```java 2020-02-21 10:24:46 WARN pulsar-client-io-1-1 - [/127.0.0.1:6650] Got exception IllegalStateException : Duplicate key TagA java.lang.IllegalStateException: Duplicate key TagA at java.util.stream.Collectors.lambda$throwingMerger$135(Collectors.java:133) ~[na:1.8.0_20] at java.util.stream.Collectors$$Lambda$84/1635934342.apply(Unknown Source) ~[na:na] at java.util.HashMap.merge(HashMap.java:1245) ~[na:1.8.0_20] at java.util.stream.Collectors.lambda$toMap$193(Collectors.java:1320) ~[na:1.8.0_20] at java.util.stream.Collectors$$Lambda$86/674653444.accept(Unknown Source) ~[na:na] at java.util.stream.ReduceOps$3ReducingSink.accept(ReduceOps.java:169) ~[na:1.8.0_20] at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1374) ~[na:1.8.0_20] at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:512) ~[na:1.8.0_20] at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:502) ~[na:1.8.0_20] at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708) ~[na:1.8.0_20] at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[na:1.8.0_20] at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499) ~[na:1.8.0_20] at org.apache.pulsar.client.impl.MessageImpl.<init>(MessageImpl.java:109) ~[pulsar-client.jar:2.5.0] at org.apache.pulsar.client.impl.ConsumerImpl.messageReceived(ConsumerImpl.java:1039) ~[pulsar-client.jar:2.5.0] at org.apache.pulsar.client.impl.ClientCnx.handleMessage(ClientCnx.java:383) ~[pulsar-client.jar:2.5.0] at org.apache.pulsar.common.protocol.PulsarDecoder.channelRead(PulsarDecoder.java:183) ~[pulsar-client.jar:2.5.0] at org.apache.pulsar.shade.io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374) [pulsar-client.jar:2.5.0] at org.apache.pulsar.shade.io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360) [pulsar-client.jar:2.5.0] ````
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