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Lu Niu commented on FLINK-22326: -------------------------------- [~trohrmann] Here is a short summary: before 1.9: job contains iterate operator can checkpoint but iterate operator might lead to data loss since it doesn't participate in checkpoint. after 1.9: job contains iterate operator will fail checkpoint whenever feedback QPS is low. Is there any plan for better supporting iterate operator? We can help to contribute if any. Thanks! > Job contains Iterate Operator always fails on Checkpoint > --------------------------------------------------------- > > Key: FLINK-22326 > URL: https://issues.apache.org/jira/browse/FLINK-22326 > Project: Flink > Issue Type: Bug > Components: Runtime / Checkpointing > Affects Versions: 1.11.1 > Reporter: Lu Niu > Priority: Major > Attachments: Screen Shot 2021-04-16 at 12.40.34 PM.png, Screen Shot > 2021-04-16 at 12.43.38 PM.png > > > Job contains Iterate Operator will always fail on checkpoint. > How to reproduce: > [https://gist.github.com/qqibrow/f297babadb0bb662ee398b9088870785] > this is based on > [https://github.com/apache/flink/blob/master/flink-examples/flink-examples-streaming/src/main/java/org/apache/flink/streaming/examples/iteration/IterateExample.java,] > but a few line difference: > 1. Make maxWaitTime large enough when create IterativeStream > 2. No output back to Itertive Source > Result: > The same code is able to checkpoint in 1.9.1 > !Screen Shot 2021-04-16 at 12.43.38 PM.png! > > but always fail on checkpoint in 1.11 > !Screen Shot 2021-04-16 at 12.40.34 PM.png! -- This message was sent by Atlassian Jira (v8.3.4#803005)