zhangshenghang opened a new issue, #7098: URL: https://github.com/apache/seatunnel/issues/7098
### Search before asking - [X] I had searched in the [issues](https://github.com/apache/seatunnel/issues?q=is%3Aissue+label%3A%22bug%22) and found no similar issues. ### What happened Flink 1.15.3 runs rabbit e2e test, the running configuration file is `rabbitmq-to-rabbitmq.conf` <img width="1193" alt="image" src="https://github.com/apache/seatunnel/assets/29418975/fbfafa06-576c-4458-a9b7-b30127785cb7";> When `checkpoint` is enabled, the `snapshotState` method of the `org.apache.seatunnel.connectors.seatunnel.rabbitmq.source.RabbitmqSplitEnumerator` class will directly return `null`  It will cause Flink `enumeratorCheckpoint` in `SourceCorrdinator` is Null  The program will eventually report a Checkpoint exception  The correct approach is to return a `RabbitSourceState` object instead of `null` This problem affects my PR [https://github.com/apache/seatunnel/pull/7040](https://github.com/apache/seatunnel/pull/7040) Build failed Please assign this issue to me and I will fix it. thx ### SeaTunnel Version 2.3.5 ### SeaTunnel Config ```conf rabbitmq-torabbitmq.conf # # Licensed to the Apache Software Foundation (ASF) under one or more # contributor license agreements. See the NOTICE file distributed with # this work for additional information regarding copyright ownership. # The ASF licenses this file to You under the Apache License, Version 2.0 # (the "License"); you may not use this file except in compliance with # the License. You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. # env { parallelism = 1 job.mode = "STREAMING" #checkpoint.interval=5000 execution.checkpoint.interval=5000 } source { RabbitMQ { host = "localhost" port = 5672 virtual_host = "/" username = "guest" password = "guest" queue_name = "test" for_e2e_testing = true schema = { fields { id = bigint c_map = "map<string, smallint>" c_array = "array<tinyint>" c_string = string c_boolean = boolean c_tinyint = tinyint c_smallint = smallint c_int = int c_bigint = bigint c_float = float c_double = double c_decimal = "decimal(2, 1)" c_bytes = bytes c_date = date c_timestamp = timestamp } } } } transform { } sink { RabbitMQ { host = "localhost" port = 5672 virtual_host = "/" username = "guest" password = "guest" queue_name = "test1" } } ``` ``` ### Running Command ```shell Run Flink Example or automatically run e2e tests ``` ### Error Exception ```log WARN org.apache.flink.runtime.checkpoint.CheckpointFailureManager - Failed to trigger or complete checkpoint 1 for job 9a061a0f2dd38089b2684598fdd6bf0d. (0 consecutive failed attempts so far) org.apache.flink.runtime.checkpoint.CheckpointException: Trigger checkpoint failure. at org.apache.flink.runtime.checkpoint.CheckpointCoordinator.lambda$getCheckpointException$19(CheckpointCoordinator.java:2162) ~[flink-runtime-1.15.3.jar:1.15.3] at java.util.Optional.orElseGet(Optional.java:267) ~[?:1.8.0_392] at org.apache.flink.runtime.checkpoint.CheckpointCoordinator.getCheckpointException(CheckpointCoordinator.java:2161) ~[flink-runtime-1.15.3.jar:1.15.3] at org.apache.flink.runtime.checkpoint.CheckpointCoordinator.onTriggerFailure(CheckpointCoordinator.java:930) ~[flink-runtime-1.15.3.jar:1.15.3] at org.apache.flink.runtime.checkpoint.CheckpointCoordinator.onTriggerFailure(CheckpointCoordinator.java:908) ~[flink-runtime-1.15.3.jar:1.15.3] at org.apache.flink.runtime.checkpoint.CheckpointCoordinator.lambda$startTriggeringCheckpoint$7(CheckpointCoordinator.java:636) ~[flink-runtime-1.15.3.jar:1.15.3] at java.util.concurrent.CompletableFuture.uniHandle(CompletableFuture.java:836) [?:1.8.0_392] at java.util.concurrent.CompletableFuture$UniHandle.tryFire(CompletableFuture.java:811) [?:1.8.0_392] at java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:456) [?:1.8.0_392] at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_392] at java.util.concurrent.FutureTask.run$$$capture(FutureTask.java:266) [?:1.8.0_392] at java.util.concurrent.FutureTask.run(FutureTask.java) [?:1.8.0_392] at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) [?:1.8.0_392] at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) [?:1.8.0_392] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_392] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_392] at java.lang.Thread.run(Thread.java:750) [?:1.8.0_392] Caused by: java.lang.NullPointerException at org.apache.flink.runtime.source.coordinator.SourceCoordinator.writeCheckpointBytes(SourceCoordinator.java:463) ~[flink-runtime-1.15.3.jar:1.15.3] at org.apache.flink.runtime.source.coordinator.SourceCoordinator.toBytes(SourceCoordinator.java:447) ~[flink-runtime-1.15.3.jar:1.15.3] at org.apache.flink.runtime.source.coordinator.SourceCoordinator.lambda$checkpointCoordinator$6(SourceCoordinator.java:321) ~[flink-runtime-1.15.3.jar:1.15.3] at org.apache.flink.runtime.source.coordinator.SourceCoordinator.lambda$runInEventLoop$9(SourceCoordinator.java:406) ~[flink-runtime-1.15.3.jar:1.15.3] at org.apache.flink.util.ThrowableCatchingRunnable.run(ThrowableCatchingRunnable.java:40) ~[flink-core-1.15.3.jar:1.15.3] ... 8 more ``` ``` ### Zeta or Flink or Spark Version Flink 1.15.3 ### Java or Scala Version 1.8 ### Screenshots _No response_ ### Are you willing to submit PR? - [X] Yes I am willing to submit a PR! ### Code of Conduct - [X] I agree to follow this project's [Code of Conduct](https://www.apache.org/foundation/policies/conduct) -- This is an automated message from the Apache Git Service. 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