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https://issues.apache.org/jira/browse/OAK-4920?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15654319#comment-15654319
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angela commented on OAK-4920:
-----------------------------
there is no guarantee that the index for {{rep:externalId}} exists as
introducing the uniqueness constraint was considered quite intrusive (though
desirable for security reasons)... but we can look into a better solution.
> Performance: DefaultSyncHandler.listIdentities() search too broad, triggers
> traversal warning
> ---------------------------------------------------------------------------------------------
>
> Key: OAK-4920
> URL: https://issues.apache.org/jira/browse/OAK-4920
> Project: Jackrabbit Oak
> Issue Type: Improvement
> Components: auth-external
> Affects Versions: 1.4.8, 1.5.11
> Reporter: Alexander Klimetschek
>
> DefaultSyncHandler.listIdentities() collects users by [searching for all
> nodes under
> /home|https://github.com/apache/jackrabbit-oak/blob/b3e62e3467bf6433b5a419c2f371331f33e57820/oak-auth-external/src/main/java/org/apache/jackrabbit/oak/spi/security/authentication/external/impl/DefaultSyncHandler.java#L143]
> – the xpath query executed is
> {noformat}
> /jcr:root/home//element(*)[@jcr:primaryType]
> {noformat}
> With a few hundred users this easily gives an oak index traversal warning:
> {noformat}
> org.apache.jackrabbit.oak.spi.query.Cursors$TraversingCursor Traversed 1000
> nodes with filter Filter(query=select [jcr:path], [jcr:score], * from
> [nt:base] as a where [jcr:primaryType] is not null and isdescendantnode(a,
> '/home') /* xpath: /jcr:root/home//element(*)[@jcr:primaryType] */,
> path=/home//*, property=[jcr:primaryType=[is not null]]); consider creating
> an index or changing the query
> {noformat}
> A few lines later [it actually
> reduces|https://github.com/apache/jackrabbit-oak/blob/b3e62e3467bf6433b5a419c2f371331f33e57820/oak-auth-external/src/main/java/org/apache/jackrabbit/oak/spi/security/authentication/external/impl/DefaultSyncHandler.java#L151]
> the result to authorizables which have a {{rep:externalId}}. Since OAK-4301
> there is an oak index for {{rep:externalId}}, so the query can be optimized
> by searching for anything with {{rep:externalId}} instead:
> {code:java}
> userManager.findAuthorizables("rep:externalId", null);
> {code}
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