1.基于K8S做HA的Flink任务要想正常，不能手动删除作业deployment，必须通过cancel,stop命令进行停止。基于上面我猜测Flink k8s HA是基于ConfigMap之上开发的，其声明周期从K8S角度不能像作业的svc一样带ownerreference。
是的，Flink K8s HA 是基于 ConfigMap 开发的，并且 HA configmap 没有设置 ownerreference，因此如果想在保留 HA 数据的情况下重启集群直接 delete deployment 就行，重启后会从最新 cp 恢复。 2.基于k8s做HA的Flink job id皆为00000000000000000000000000000000。 开启 HA 的 Application mode 的 Flink job id 皆为00000000000000000000000000000000，与是否使用 K8s HA 无关。job id 是作业的唯一标识符，HA 服务使用它来命名和寻址和单个作业有关的 HA 资源（如保存的 jobgraph 和 cp）。Application mode 下 jobgraph 在 JM 生成，不开启 HA 时每次生成 jobgraph 会随机生成一个 job id 作为 job 的 唯一标识符，开启 HA 时需要使用一个固定的 job id （一串 0 的 jobid 就是这么来的），否则 JM failover 后重新生成了一个新的不同的 job id，无法和之前的 cp 相关联，导致作业从全新状态恢复。 3.Flink k8s HA 是如何工作的,其中存储了什么信息？我想学习其中相关实现，如果大家有其设计文档或相关资料，希望可以回此邮件告诉我，谢谢。 可以看下官方的博客文章： https://flink.apache.org/2021/02/10/native-k8s-with-ha.html，更多细节可以参阅 JIRA 设计文档：https://cwiki.apache.org/confluence/display/FLINK/FLIP-144%3A+Native+Kubernetes+HA+for+Flink Best, Zhanghao Chen ________________________________ From: m18814122325 <m18814122...@163.com> Sent: Sunday, June 12, 2022 22:45 To: user-zh@flink.apache.org <user-zh@flink.apache.org> Subject: Flink k8s HA 手动删除作业deployment导致的异常 Flink version: 1.15.0 deploy mode: Native k8s application 问题现象: 我以Native k8s模式部署了一个基于K8S做HA的Flink任务，当我手动删除了作业的deployment后，发现作业做HA的ConfigMap还存在。并且接下来不加参数-s 再次启动作业，从启动日志发现其会从上述ConfigMap记录信息中恢复。 kubectl delete deployment flink-bdra-sql-application-job -n bdra-dev-flink-standalone kubectl get configMap -n bdra-dev-flink-standalone NAME DATA AGE flink-bdra-sql-application-job-00000000000000000000000000000000-config-map 2 13m flink-bdra-sql-application-job-cluster-config-map 1 13m 我有以下疑问： 1.基于K8S做HA的Flink任务要想正常，不能手动删除作业deployment，必须通过cancel,stop命令进行停止。基于上面我猜测Flink k8s HA是基于ConfigMap之上开发的，其声明周期从K8S角度不能像作业的svc一样带ownerreference。 2.基于k8s做HA的Flink job id皆为00000000000000000000000000000000。 3.Flink k8s HA 是如何工作的,其中存储了什么信息？我想学习其中相关实现，如果大家有其设计文档或相关资料，希望可以回此邮件告诉我，谢谢。 重启命令(不带-s参数，意味着命令本身不带任何从ck或者savepoint恢复) flink run-application --target kubernetes-application -c CalculateUv -Dkubernetes.cluster-id=flink-bdra-sql-application-job-s3p -Dkubernetes.container.image=acpimagehub.cgb.cn/bdra_dev/flink-sql-s3:v0.20 -Dkubernetes.namespace=bdra-dev-flink-standalone -Dkubernetes.service-account=bdra-dev-flink-standalone-sa -Djobmanager.memory.process.size=1024m -Dkubernetes.jobmanager.cpu=2 -Dkubernetes.taskmanager.cpu=2 -Dparallelism.default=8 -Dtaskmanager.numberOfTaskSlots=2 -Dtaskmanager.memory.process.size=2144m -Dstate.backend=filesystem -Dstate.checkpoints.dir=s3p://bdra-user-lun01/flink-checkpoints/flink-bdra-sql-application-job-s3 -Dstate.savepoints.dir=s3a://bdra-user-lun01/flink-savepoints/flink-bdra-sql-application-job-s3 -Dhigh-availability=org.apache.flink.kubernetes.highavailability.KubernetesHaServicesFactory -Dhigh-availability.storageDir=file:///opt/flink/log/recovery -Ds3.access-key=* -Ds3.secret-key=* -Dmetrics.reporter.influxdb.factory.class=org.apache.flink.metrics.influxdb.InfluxdbReporterFactory -Dmetrics.reporter.influxdb.scheme=http -Dmetrics.reporter.influxdb.host=influxdb -Dmetrics.reporter.influxdb.port=8086 -Dmetrics.reporter.influxdb.db=flink_metrics -Dmetrics.reporter.influxdb.consistency=ANY -Ds3.endpoint=http://*:80 -Dkubernetes.rest-service.exposed.type=ClusterIP -Dkubernetes.config.file=kube_config -Dkubernetes.pod-template-file=pod-template.yaml local:///opt/flink/usrlib/flink-sql-1.0-SNAPSHOT.jar 重启后自动从ConfigMap中恢复。 2022-06-10 20:20:52,592 INFO org.apache.flink.runtime.dispatcher.runner.SessionDispatcherLeaderProcess [] - Successfully recovered 1 persisted job graphs. 2022-06-10 20:20:52,654 INFO org.apache.flink.runtime.rpc.akka.AkkaRpcService [] - Starting RPC endpoint for org.apache.flink.runtime.dispatcher.StandaloneDispatcher at akka://flink/user/rpc/dispatcher_1 . 2022-06-10 20:20:53,552 INFO org.apache.flink.kubernetes.KubernetesResourceManagerDriver [] - Recovered 0 pods from previous attempts, current attempt id is 1. 2022-06-10 20:20:53,552 INFO org.apache.flink.runtime.resourcemanager.active.ActiveResourceManager [] - Recovered 0 workers from previous attempt. 2022-06-10 20:20:55,352 INFO org.apache.flink.runtime.leaderelection.DefaultLeaderElectionService [] - Starting DefaultLeaderElectionService with org.apache.flink.runtime.leaderelection.MultipleComponentLeaderElectionDriverAdapter@2a1814a5. 2022-06-10 20:20:55,370 INFO org.apache.flink.client.ClientUtils [] - Starting program (detached: false) 2022-06-10 20:20:55,394 INFO org.apache.flink.runtime.rpc.akka.AkkaRpcService [] - Starting RPC endpoint for org.apache.flink.runtime.jobmaster.JobMaster at akka://flink/user/rpc/jobmanager_2 . 2022-06-10 20:20:55,438 INFO org.apache.flink.runtime.jobmaster.JobMaster [] - Initializing job 'insert-into_default_catalog.default_database.buy_cnt_per_hour' (00000000000000000000000000000000). 2022-06-10 20:20:55,477 INFO org.apache.flink.runtime.jobmaster.JobMaster [] - Using restart back off time strategy FixedDelayRestartBackoffTimeStrategy(maxNumberRestartAttempts=2147483647, backoffTimeMS=1000) for insert-into_default_catalog.default_database.buy_cnt_per_hour (00000000000000000000000000000000). 2022-06-10 20:20:55,558 INFO org.apache.flink.runtime.checkpoint.DefaultCompletedCheckpointStoreUtils [] - Recovering checkpoints from KubernetesStateHandleStore{configMapName='flink-bdra-sql-application-job-00000000000000000000000000000000-config-map'}. 2022-06-10 20:20:55,572 INFO org.apache.flink.runtime.checkpoint.DefaultCompletedCheckpointStoreUtils [] - Found 1 checkpoints in KubernetesStateHandleStore{configMapName='flink-bdra-sql-application-job-00000000000000000000000000000000-config-map'}. 2022-06-10 20:20:55,572 INFO org.apache.flink.runtime.checkpoint.DefaultCompletedCheckpointStoreUtils [] - Trying to fetch 1 checkpoints from storage. 2022-06-10 20:20:55,572 INFO org.apache.flink.runtime.checkpoint.DefaultCompletedCheckpointStoreUtils [] - Trying to retrieve checkpoint 64. 2022-06-10 20:20:55,760 INFO org.apache.flink.runtime.jobmaster.JobMaster [] - Running initialization on master for job insert-into_default_catalog.default_database.buy_cnt_per_hour (00000000000000000000000000000000). 2022-06-10 20:20:55,760 INFO org.apache.flink.runtime.jobmaster.JobMaster [] - Successfully ran initialization on master in 0 ms. 2022-06-10 20:20:56,254 INFO org.apache.flink.runtime.scheduler.adapter.DefaultExecutionTopology [] - Built 1 new pipelined regions in 2 ms, total 1 pipelined regions currently. 2022-06-10 20:20:56,266 INFO org.apache.flink.runtime.jobmaster.JobMaster [] - Using job/cluster config to configure application-defined state backend: org.apache.flink.runtime.state.hashmap.HashMapStateBackend@5151a2cd 2022-06-10 20:20:56,267 INFO org.apache.flink.runtime.jobmaster.JobMaster [] - Using application-defined state backend: org.apache.flink.runtime.state.hashmap.HashMapStateBackend@5cfc3f54 2022-06-10 20:20:56,267 INFO org.apache.flink.runtime.state.StateBackendLoader [] - State backend loader loads the state backend as HashMapStateBackend 2022-06-10 20:20:56,270 INFO org.apache.flink.runtime.jobmaster.JobMaster [] - Using job/cluster config to configure application-defined checkpoint storage: org.apache.flink.runtime.state.storage.FileSystemCheckpointStorage@f3bc6a6 2022-06-10 20:20:57,763 INFO org.apache.flink.runtime.checkpoint.CheckpointCoordinator [] - Restoring job 00000000000000000000000000000000 from Checkpoint 64 @ 1654863136682 for 00000000000000000000000000000000 located at s3p://otsp-flink-lun01/flink-checkpoints/00000000000000000000000000000000/chk-64. 2022-06-10 20:20:57,797 INFO org.apache.flink.runtime.checkpoint.CheckpointCoordinator [] - No master state to restore 2022-06-10 20:20:57,798 INFO org.apache.flink.runtime.operators.coordination.RecreateOnResetOperatorCoordinator [] - Resetting coordinator to checkpoint. 2022-06-10 20:20:57,839 INFO org.apache.flink.runtime.source.coordinator.SourceCoordinator [] - Closing SourceCoordinator for source Source: user_behavior[1]. 2022-06-10 20:20:57,840 INFO org.apache.flink.runtime.source.coordinator.SourceCoordinator [] - Source coordinator for source Source: user_behavior[1] closed. 2022-06-10 20:20:57,847 INFO org.apache.flink.runtime.source.coordinator.SourceCoordinator [] - Restoring SplitEnumerator of source Source: user_behavior[1] from checkpoint. 2022-06-10 20:20:57,866 INFO org.apache.flink.runtime.jobmaster.JobMaster [] - Using failover strategy org.apache.flink.runtime.executiongraph.failover.flip1.RestartPipelinedRegionFailoverStrategy@55d02910 for insert-into_default_catalog.default_database.buy_cnt_per_hour (00000000000000000000000000000000). 2022-06-10 20:20:57,989 INFO org.apache.flink.runtime.leaderretrieval.DefaultLeaderRetrievalService [] - Starting DefaultLeaderRetrievalService with KubernetesLeaderRetrievalDriver{configMapName='flink-bdra-sql-application-job-cluster-config-map'}. 2022-06-10 20:20:57,989 INFO org.apache.flink.kubernetes.kubeclient.resources.KubernetesConfigMapSharedInformer [] - Starting to watch for bdra-dev-flink-standalone/flink-bdra-sql-application-job-cluster-config-map, watching id:93e9b11c-a69c-425a-b35a-e65bc53ea5b1 2022-06-10 20:20:57,990 INFO org.apache.flink.runtime.jobmaster.JobMaster [] - Starting execution of job 'insert-into_default_catalog.default_database.buy_cnt_per_hour' (00000000000000000000000000000000) under job master id 92d47a56896398911c0078e0a2544608. 2022-06-10 20:20:57,996 INFO org.apache.flink.runtime.source.coordinator.SourceCoordinator [] - Starting split enumerator for source Source: user_behavior[1]. 2022-06-10 20:20:57,998 INFO org.apache.flink.runtime.jobmaster.JobMaster [] - Starting scheduling with scheduling strategy [org.apache.flink.runtime.scheduler.strategy.PipelinedRegionSchedulingStrategy] 2022-06-10 20:20:57,999 INFO org.apache.flink.runtime.executiongraph.ExecutionGraph [] - Job insert-into_default_catalog.default_database.buy_cnt_per_hour (00000000000000000000000000000000) switched from state CREATED to RUNNING. 2022-06-10 20:20:58,049 INFO org.apache.flink.runtime.executiongraph.ExecutionGraph [] - Source: user_behavior[1] -> Calc[2] -> LocalWindowAggregate[3] (1/8) (1b3b93d9f79b647fcc54d5253974d94f) switched from CREATED to SCHEDULED. 2022-06-10 20:20:58,050 INFO org.apache.flink.runtime.executiongraph.ExecutionGraph [] - Source: user_behavior[1] -> Calc[2] -> LocalWindowAggregate[3] (2/8) (ebf049155617e3fc58d449eb9f3b0eb6) switched from CREATED to SCHEDULED. 2022-06-10 20:20:58,050 INFO org.apache.flink.runtime.executiongraph.ExecutionGraph [] - Source: user_behavior[1] -> Calc[2] -> LocalWindowAggregate[3] (3/8) (118cb05f1cb95e9a569a1d99e5aef29e) switched from CREATED to SCHEDULED.
