[jira] [Commented] (FLINK-26930) Rethink last-state upgrade implementation in flink-kubernetes-operator

["ConradJam (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-26930?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17558060#comment-17558060 ] 

ConradJam commented on FLINK-26930:
-----------------------------------

I think this part of the information should be saved in ConfigMap or Zookeeper. If it is saved in JRS, the above problems may exist. If we want to do this, we need to add this function in Flink HA and design its storage result to save it with metadata such as FlinkJobID and snapshot path.

or I can drive and take charge of the work

What do you think [~wangyang0918] [~thw] 

> Rethink last-state upgrade implementation in flink-kubernetes-operator
> ----------------------------------------------------------------------
>
>                 Key: FLINK-26930
>                 URL: https://issues.apache.org/jira/browse/FLINK-26930
>             Project: Flink
>          Issue Type: Improvement
>          Components: Kubernetes Operator
>            Reporter: Yang Wang
>            Priority: Major
>
> Following the discussion in FLINK-26916.
>  
> How the last-state upgrade works now?
> First, delete the Flink cluster directly with HA ConfigMap retained. This leaves job in a "SUSPENDED" state. Then flink-kubernetes-operator will deploy a new Flink application with same cluster-id so that it could recover from the latest checkpoint. Please note that before starting the application, JobGraph will be deleted from the HA ConfigMap. This is to ensure the newly changed job options could take effect.
>  
> Solution 1: Extend the JRS so the stored job result contains list of retained checkpoints. This of course implies that cluster gets shut down / job gets terminated properly (other cases should be used for fail-over scenarios only).
>  
> Solution 2: Store the last checkpoint path in the Kubernetes HA ConfigMap. This could be a minimal backward compatible change that we could backport to release-1.15/release-1.14.
>  
> As soon as there is a straightforward way of accessing the last checkpoint, we should improve the current implementation.



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