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https://issues.apache.org/jira/browse/SENTRY-2184?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16405730#comment-16405730
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Alexander Kolbasov commented on SENTRY-2184:
--------------------------------------------
I think we may have a somewhat symmetrical issue when writing snapshots - what
do you think about it?
Also, are there any similar cases where using fetch groups would help? They
don't have to be addressed with your fix but since you have good understanding
of the issue it may be good to file JIRA(s) for other places where this can be
relevant.
> 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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