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https://issues.apache.org/jira/browse/SENTRY-2184?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16406677#comment-16406677
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Alexander Kolbasov commented on SENTRY-2184:
--------------------------------------------
[~LinaAtAustin] Yes, that's exactly what I am talking about on the write side.
In your fix - do you really need to set maxFetchDepth or not?
Did you run any perf tests to measure the difference in performance?
SENTRY-1937 has some examples.
> Performance Issue: MPath is queried for each MAuthzPathsMapping in full
> snapshot
> --------------------------------------------------------------------------------
>
> Key: SENTRY-2184
> URL: https://issues.apache.org/jira/browse/SENTRY-2184
> Project: Sentry
> Issue Type: Bug
> Components: Sentry
> Affects Versions: 2.1.0
> Reporter: Na Li
> Assignee: Na Li
> Priority: Critical
> Attachments: SENTRY-2184.001.patch
>
>
> MAuthzPathsMapping contains list of MPath instances. From log message, when
> getting path full snapshot at SentryStore.retrieveFullPathsImageCore(),
> DataNucleus issues a query for all MPath instances associated with each
> MAuthzPathsMapping. Therefore, getting full path image may take a very long
> time.
> The solution is to get MPath in a batch when getting full path image.
> Log Message when DataNucleus issues a query for all MPath instances
> associated with each MAuthzPathsMapping
> {code:java}
> 1) Initially, all MAuthzPathsMapping entries for current snapshot is queried.
> 2018-03-14 11:51:23,999 (main) [DEBUG -
> org.datanucleus.util.Log4JLogger.debug(Log4JLogger.java:58)] SELECT
> 'org.apache.sentry.provider.db.service.model.MAuthzPathsMapping' AS
> NUCLEUS_TYPE,A0.AUTHZ_OBJ_NAME,A0.AUTHZ_SNAPSHOT_ID,A0.CREATE_TIME_MS,A0.AUTHZ_OBJ_ID
> FROM AUTHZ_PATHS_MAPPING A0 WHERE A0.AUTHZ_SNAPSHOT_ID = <1>
> 2) call authzToPaths.getPathStrings() causes MPath to be queried for each
> AUTHZ_OBJ_ID
> 2018-03-14 11:52:27,700 (main) [DEBUG -
> org.datanucleus.util.Log4JLogger.debug(Log4JLogger.java:58)] SELECT
> 'org.apache.sentry.provider.db.service.model.MPath' AS
> NUCLEUS_TYPE,A0.PATH_NAME,A0.PATH_ID FROM AUTHZ_PATH A0 WHERE A0.AUTHZ_OBJ_ID
> = <1>{code}
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