Hi lvan Yang, #1. If a TaskManager crashed exceptionally and there are some running task on it, it could not join back gracefully. Whether the full job will be restarted depends on the failover strategies.
#2. Currently, when new TaskManagers join to the Flink cluster, the running Flink job could not rescale automatically. You need to stop with a savepoint and restart the job manually. The community is still working on this. And you could find more information in this ticket. . https://ci.apache.org/projects/flink/flink-docs-stable/dev/task_failure_recovery.html#failover-strategies . https://issues.apache.org/jira/browse/FLINK-10407 Best, Yang Ivan Yang <ivanygy...@gmail.com> 于2020年5月21日周四 下午3:01写道： > Hi, > > I have setup Filnk 1.9.1 on Kubernetes on AWS EKS with one job manager > pod, 10 task manager pods, one pod per EC2 instance. Job runs fine. After a > while, for some reason, one pod (task manager) crashed, then the pod > restarted. After that, the job got into a bad state. All the parallelisms > are showing different color (orange, purple) on the console. I had to > basically stop the entire job. My question is should a task manager restart > affect the entire cluster/job? Or should it join back gracefully? > > Second question is regarding to auto scaling Flink cluster on kubernetes. > If I add more nodes/pods (task manager containers) to the cluster, will a > running Flink job redistribute load to the additional resources or I have > to stop to a savepoint, and restart the job? > > Thanks and regards. > Ivan