Henry Robinson resolved IMPALA-5785.
       Resolution: Fixed
    Fix Version/s:     (was: Impala 2.10.0)
                   Impala 2.0

This already happens for nodes that have ever run a query. See 

My understanding is that is sufficient - if you've seen a bug that's 
attributable to this not working, please attach some more information! We don't 
have a lot of testing for this path.

> Purge local connection pool if node statestore marks node offline
> -----------------------------------------------------------------
>                 Key: IMPALA-5785
>                 URL: https://issues.apache.org/jira/browse/IMPALA-5785
>             Project: IMPALA
>          Issue Type: Bug
>          Components: Backend
>    Affects Versions: Impala 2.9.0
>            Reporter: Lars Volker
>            Priority: Critical
>             Fix For: Impala 2.0
> From time to time there seem to be issues with stale connection pool entries 
> when nodes restart. In cases where the backend receives an update from the 
> statestore that a node has gone offline, we should remove connections to that 
> node from the connection pool.

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