zyllt opened a new issue #6576: Failed to create Consumer for the first time URL: https://github.com/apache/pulsar/issues/6576 **Describe the bug** I have 2 clusters, Beijing and Guangzhou IDC. I created a namespace and enabled geo-replication. Under this namespace, I first successfully created a producer in Beijing IDC with topic name is `enant-test/n-1/topic-1` and `Schema.STRING`, but when I create a consumer in Guangzhou with same schema, it keeps failing. **To Reproduce** Steps to reproduce the behavior: 1. deploy Cluster A and B,then created a namespace `tenant-test/n-1` and enabled geo-replication 2. created the producer in ClusterA and send a message,topic name is `enant-test/n-1/topic-1` 3. create the consumer in Cluster B with same topic 4. See error `org.apache.pulsar.client.api.PulsarClientException$IncompatibleSchemaException: Topic does not have schema to check` **Screenshots** ``` org.apache.pulsar.client.api.PulsarClientException$IncompatibleSchemaException: Topic does not have schema to check at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1628) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:761) at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:867) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:543) at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693) at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:360) at org.springframework.boot.SpringApplication.run(SpringApplication.java:303) at org.springframework.boot.SpringApplication.run(SpringApplication.java:1118) at org.springframework.boot.SpringApplication.run(SpringApplication.java:1107) at com.kugou.fanxing.starduration.Application.main(Application.java:15) Caused by: org.apache.pulsar.client.api.PulsarClientException$IncompatibleSchemaException: Topic does not have schema to check at org.apache.pulsar.client.api.PulsarClientException.unwrap(PulsarClientException.java:673) at org.apache.pulsar.client.impl.ConsumerBuilderImpl.subscribe(ConsumerBuilderImpl.java:97) at ``` **Desktop (please complete the following information):** - OS:Pulsar 2.5.0 **Additional context** I located the following source code based on the exception information ``` @Override public CompletableFuture<Void> checkConsumerCompatibility(String schemaId, SchemaData schemaData, SchemaCompatibilityStrategy strategy) { return getSchema(schemaId).thenCompose(existingSchema -> { if (existingSchema != null && !existingSchema.schema.isDeleted()) { if (strategy == SchemaCompatibilityStrategy.BACKWARD || strategy == SchemaCompatibilityStrategy.FORWARD || strategy == SchemaCompatibilityStrategy.FORWARD_TRANSITIVE || strategy == SchemaCompatibilityStrategy.FULL) { return checkCompatibilityWithLatest(schemaId, schemaData, SchemaCompatibilityStrategy.BACKWARD); } else { return checkCompatibilityWithAll(schemaId, schemaData, strategy); } } else { return FutureUtil.failedFuture(new IncompatibleSchemaException("Topic does not have schema to check")); } }); } ``` I checked path `/schemas` in zk according to the method `getSchema` and found that there is no schemaInfo for this topic. I continued to read the source code and found the following code. `hasSchema || isActive()` should be false,but ` ledger.getTotalSize()` should also be 0,because I haven't sent any messages in cluster B. ``` @Override public CompletableFuture<Void> addSchemaIfIdleOrCheckCompatible(SchemaData schema) { return hasSchema() .thenCompose((hasSchema) -> { if (hasSchema || isActive() || ledger.getTotalSize() != 0) { return checkSchemaCompatibleForConsumer(schema); } else { return addSchema(schema).thenCompose(schemaVersion -> CompletableFuture.completedFuture(null)); } }); } ```
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