RANGER-5153: fix for intermittent unit test failure in RangerJSONAuditWriterTest #536
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What changes were proposed in this pull request?
The test checks for null value for AbstractRangerAuditWriter.logWriter in the main test thread. This member is updated in antoher thread that periodically looks to close the audit file. AbstractRangerAuditWriter.logWriter is now made vollatile so that updated value is visible in the main test thread.
How was this patch tested?
Build with unit tests completed successfully.