[jira] [Commented] (FLINK-10866) Queryable state can prevent cluster from starting

["BoWang (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-10866?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16733902#comment-16733902 ] 

BoWang commented on FLINK-10866:
--------------------------------

hi, has anyone taken this jira? If not, I would like to take this.

> Queryable state can prevent cluster from starting
> -------------------------------------------------
>
>                 Key: FLINK-10866
>                 URL: https://issues.apache.org/jira/browse/FLINK-10866
>             Project: Flink
>          Issue Type: Improvement
>          Components: Local Runtime
>    Affects Versions: 1.5.5, 1.6.2, 1.7.0
>            Reporter: Till Rohrmann
>            Priority: Critical
>             Fix For: 1.8.0
>
>
> The {{KvStateServerImpl}} can currently prevent the {{TaskExecutor}} from starting. 
> Currently, the QS server starts per default on port {{9067}}. If this port is not free, then it fails and stops the whole initialization of the {{TaskExecutor}}. I think the QS server should not stop the {{TaskExecutor}} from starting.
> We should at least change the default port to {{0}} to avoid port conflicts. However, this will break all setups which don't explicitly set the QS port because now it either needs to be setup or extracted from the logs.
> Additionally, we should think about whether a QS server startup failure should lead to a {{TaskExecutor}} failure or simply be logged. Both approaches have pros and cons. Currently, a failing QS server will also affect users which don't want to use QS. If we tolerate failures in the QS server, then a user who wants to use QS might run into problems with state not being reachable.



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