[jira] [Created] (SENTRY-1751) HMSFollower should not persist empty full snapshot

["Na Li (JIRA)" <ji...@apache.org>]

Na Li created SENTRY-1751:
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             Summary: HMSFollower should not persist empty full snapshot
                 Key: SENTRY-1751
                 URL: https://issues.apache.org/jira/browse/SENTRY-1751
             Project: Sentry
          Issue Type: Bug
          Components: Sentry
    Affects Versions: sentry-ha-redesign
            Reporter: Na Li


When HMSFollower gets empty full snapshot, it should not persist it in SentryStore. 

Right now, it persists the empty full snapshot, and causes default AuthzObj saved in SentryStore. When another empty full snapshot is persisted, exception occurs.

2017-05-03 09:58:42,209 (pool-5-thread-1) [ERROR - org.apache.sentry.service.thrift.HMSFollower.run(HMSFollower.java:304)] Caught unexpected exception in HMSFollower! Caused by: AuthzObj: default already exists
org.apache.sentry.core.common.exception.SentryAlreadyExistsException: AuthzObj: default already exists
	at org.apache.sentry.provider.db.service.persistent.SentryStore.createAuthzPathsMappingCore(SentryStore.java:2541)
	at org.apache.sentry.provider.db.service.persistent.SentryStore.access$3000(SentryStore.java:101)
	at org.apache.sentry.provider.db.service.persistent.SentryStore$42.execute(SentryStore.java:2515)
	at org.apache.sentry.provider.db.service.persistent.TransactionManager.executeTransaction(TransactionManager.java:114)
	at org.apache.sentry.provider.db.service.persistent.TransactionManager.executeTransactionWithRetry(TransactionManager.java:181)
	at org.apache.sentry.provider.db.service.persistent.SentryStore.persistFullPathsImage(SentryStore.java:2511)
	at org.apache.sentry.service.thrift.HMSFollower.run(HMSFollower.java:269)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)



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