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https://issues.apache.org/jira/browse/JCRVLT-804?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17979874#comment-17979874
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Angela Schreiber commented on JCRVLT-804:
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fwiw: this is only called in case if the import mode is "merge" or
"merge-properties"
> Slow performances when importing large groups
> ---------------------------------------------
>
> Key: JCRVLT-804
> URL: https://issues.apache.org/jira/browse/JCRVLT-804
> Project: Jackrabbit FileVault
> Issue Type: Improvement
> Reporter: Nicola Scendoni
> Priority: Major
>
> When importing group membership filevault [perform following
> operations|https://github.com/apache/jackrabbit-filevault/blob/4da7c7c7bea23935daeb29989f735f7de5d7b2e6/vault-core/src/main/java/org/apache/jackrabbit/vault/fs/spi/impl/jcr20/JackrabbitUserManagement.java#L129-L154]:
> # iterate over all the members
> # check if the user exists
> # check if they are already members
> # call the method Group.addMember(User)
> The last method on step 4 check again if the user exists and if is already
> member of the group and if he exists, and then add him to the group.
> The import of a group with few thousand members can take several minutes.
> If we use the method
> [Group.addMembers(String[])|https://jackrabbit.apache.org/oak/docs/apidocs/org/apache/jackrabbit/api/security/user/Group.html#addMembers(java.lang.String...)]
> the group can be imported in few seconds.
> We may evaluate one of the following:
> # Skip all the validations and import all the users with a single call to
> [Group.addMembers(String[])|https://jackrabbit.apache.org/oak/docs/apidocs/org/apache/jackrabbit/api/security/user/Group.html#addMembers(java.lang.String...)].
> # Maintain the validations only in OAK or in the filevault, but not in both.
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