pouledodue opened a new issue #5231: schema scheme BACKWARD should permit new fields URL: https://github.com/apache/pulsar/issues/5231 **Describe the bug** With schema scheme set to `backward` I should be able to upload a new schema containing a new field. **To Reproduce** Steps to reproduce the behavior: I wrote a small script: [schema_test.sh.txt](https://github.com/apache/pulsar/files/3633093/schema_test.sh.txt) **Expected behavior** updated schema should contain `lakitu` **Screenshots** If applicable, add screenshots to help explain your problem. **Desktop (please complete the following information):** - macOS Catalina, - docker -> pulsar:2.4.1 in standalone mode ** Stack trace ``` 20:30:16.429 [ForkJoinPool.commonPool-worker-1] ERROR org.apache.pulsar.broker.service.schema.AvroSchemaBasedCompatibilityCheck - Error during schema compatibility check: Unable to read schema: { "type" : "record", "name" : "ZSchema", "fields" : [ { "name" : "goumba", "type" : "string" }, { "name" : "yoshi", "type" : "string" } ] } using schema: { "type" : "record", "name" : "ZSchema", "fields" : [ { "name" : "goumba", "type" : "string" }, { "name" : "yoshi", "type" : "string" }, { "name" : "lakitu", "type" : "string" } ] } org.apache.avro.SchemaValidationException: Unable to read schema: { "type" : "record", "name" : "ZSchema", "fields" : [ { "name" : "goumba", "type" : "string" }, { "name" : "yoshi", "type" : "string" } ] } using schema: { "type" : "record", "name" : "ZSchema", "fields" : [ { "name" : "goumba", "type" : "string" }, { "name" : "yoshi", "type" : "string" }, { "name" : "lakitu", "type" : "string" } ] } at org.apache.avro.ValidateMutualRead.canRead(ValidateMutualRead.java:70) ~[org.apache.avro-avro-1.8.2.jar:1.8.2] at org.apache.avro.ValidateMutualRead.validate(ValidateMutualRead.java:44) ~[org.apache.avro-avro-1.8.2.jar:1.8.2] at org.apache.avro.ValidateLatest.validate(ValidateLatest.java:51) ~[org.apache.avro-avro-1.8.2.jar:1.8.2] at org.apache.pulsar.broker.service.schema.AvroSchemaBasedCompatibilityCheck.isCompatible(AvroSchemaBasedCompatibilityCheck.java:56) ~[org.apache.pulsar-pulsar-broker-2.4.1.jar:2.4.1] at org.apache.pulsar.broker.service.schema.AvroSchemaCompatibilityCheck.isCompatible(AvroSchemaCompatibilityCheck.java:26) ~[org.apache.pulsar-pulsar-broker-2.4.1.jar:2.4.1] at org.apache.pulsar.broker.service.schema.AvroSchemaBasedCompatibilityCheck.isCompatible(AvroSchemaBasedCompatibilityCheck.java:42) ~[org.apache.pulsar-pulsar-broker-2.4.1.jar:2.4.1] at org.apache.pulsar.broker.service.schema.AvroSchemaCompatibilityCheck.isCompatible(AvroSchemaCompatibilityCheck.java:26) ~[org.apache.pulsar-pulsar-broker-2.4.1.jar:2.4.1] at org.apache.pulsar.broker.service.schema.SchemaRegistryServiceImpl.isCompatible(SchemaRegistryServiceImpl.java:220) ~[org.apache.pulsar-pulsar-broker-2.4.1.jar:2.4.1] at org.apache.pulsar.broker.service.schema.SchemaRegistryServiceImpl.lambda$checkCompatibilityWithLatest$14(SchemaRegistryServiceImpl.java:229) ~[org.apache.pulsar-pulsar-broker-2.4.1.jar:2.4.1] at java.util.concurrent.CompletableFuture.uniApply(CompletableFuture.java:602) ~[?:1.8.0_212] at java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:577) ~[?:1.8.0_212] at java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:474) ~[?:1.8.0_212] at java.util.concurrent.CompletableFuture.complete(CompletableFuture.java:1962) ~[?:1.8.0_212] at org.apache.pulsar.broker.service.schema.BookkeeperSchemaStorage.lambda$null$5(BookkeeperSchemaStorage.java:188) ~[org.apache.pulsar-pulsar-broker-2.4.1.jar:2.4.1] at java.util.concurrent.CompletableFuture.uniHandle(CompletableFuture.java:822) [?:1.8.0_212] at java.util.concurrent.CompletableFuture$UniHandle.tryFire(CompletableFuture.java:797) [?:1.8.0_212] at java.util.concurrent.CompletableFuture$Completion.exec(CompletableFuture.java:443) [?:1.8.0_212] at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289) [?:1.8.0_212] at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056) [?:1.8.0_212] at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692) [?:1.8.0_212] at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157) [?:1.8.0_212] ```
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