[jira] [Resolved] (IMPALA-14466) Admissiond remote client retry may not work if ip changes

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

     [ https://issues.apache.org/jira/browse/IMPALA-14466?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Yida Wu resolved IMPALA-14466.
------------------------------
    Target Version: Impala 5.0.0
        Resolution: Fixed

> Admissiond remote client retry may not work if ip changes
> ---------------------------------------------------------
>
>                 Key: IMPALA-14466
>                 URL: https://issues.apache.org/jira/browse/IMPALA-14466
>             Project: IMPALA
>          Issue Type: Bug
>          Components: Backend
>    Affects Versions: Impala 5.0.0
>            Reporter: Yida Wu
>            Assignee: Yida Wu
>            Priority: Major
>
> The {{RemoteAdmissionControlClient}} gets the service proxy for {{admissiond}} once before entering the retry loop. If the {{admissiond}} service restarts and its endpoint IP changes, the client will endlessly retry against the old, stale IP address, causing the query to fail with a timeout.
> Reproduce{*}:{*}
>  # Start with {{admissiond}} service.
>  # Change the admission_service_host, let's say it is set to "localhost", we change the localhost to inaccessible ip 127.0.0.2 in /etc/hosts.
>  # Submit a query, and it will be blocked in the retry logic.
>  # Change the localhost back to 127.0.0.1 in /etc/hosts.
>  # *Expected:* The client's retry logic should discover the new {{admissiond}} ip and succeed.
>  # *Actual:* The client continues retrying the old IP and the query times out.
> Move the {{AdmissionControlService::GetProxy()}} call inside the {{while}} loop could be a solution.



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