Li Li created SENTRY-1510:
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             Summary: Add option to use non pool model for sentry client
                 Key: SENTRY-1510
                 URL: https://issues.apache.org/jira/browse/SENTRY-1510
             Project: Sentry
          Issue Type: Improvement
    Affects Versions: sentry-ha-redesign
            Reporter: Li Li
            Assignee: Li Li


Currently sentry clients e.g. impala uses non pool model 
(SentryPolicyServiceClientDefaultImpl), thus it's better to keep the non pool 
model for those clients to avoid unnecessary incompatible issues.
Also the current pool model (PoolClientInvocationHandler) does not manage the 
opening connections well. e.g. Opening connections with failed servers should 
be closed promptly.



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