Yida Wu created IMPALA-14466:
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Summary: 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
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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