[jira] [Created] (RANGER-4170) keep policy-cache snapshot for each update

["Xiaomin Zhang (Jira)" <ji...@apache.org>]

Xiaomin Zhang created RANGER-4170:
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             Summary: keep policy-cache snapshot for each update
                 Key: RANGER-4170
                 URL: https://issues.apache.org/jira/browse/RANGER-4170
             Project: Ranger
          Issue Type: Improvement
          Components: plugins
            Reporter: Xiaomin Zhang


We observed strange issue that plugin is not able to find the correct policy hence failing the access request.  This is intermittent and not reproduced at will.  This issue seems gone after restarting the component or RangerAdmin or make some slight changes to the affected policy, or just wait for some while without doing any thing.  

Since policy-cache snapshot at the issue time is critical to debug this issue, but there is a major gap here to keep the snapshot. We need some improvement in component plugin to keep every policy-cache snapshot when it's updated, so that we can trace back to find the policy-cache at the point of time when issue recurs.



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