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https://issues.apache.org/jira/browse/AMBARI-12450?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Levas updated AMBARI-12450:
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Attachment: AMBARI-12450_01.patch
> Kerberos: ServiceResourceProvider queries for KDC connectivity when not needed
> ------------------------------------------------------------------------------
>
> Key: AMBARI-12450
> URL: https://issues.apache.org/jira/browse/AMBARI-12450
> Project: Ambari
> Issue Type: Bug
> Components: ambari-server
> Affects Versions: 2.0.0, 2.0.1, 2.1.0
> Reporter: Robert Levas
> Assignee: Robert Levas
> Labels: kerberos, rest_api
> Fix For: 2.1.1
>
> Attachments: AMBARI-12450_01.patch
>
>
> When querying for information about services installed in a Kerberized
> cluster via the REST API, the ServiceResourceProvider always attempts to
> contact the KDC (or Active Directory) if the KERBEROS service is selected
> within the query.
> This can be seen about every 15 seconds, when the UI queries for the state
> of the services in a Kerberized cluster using the following query:
> {noformat}
> GET
> /api/v1/clusters/{cluster_name}/services?fields=ServiceInfo/state,ServiceInfo/maintenance_state&minimal_response=true
> {noformat}
> The result from this query does not contain the KDC connectivity attributes
> (which is expected), yet the detail are obtained.
> This issue causes excess overhead in Ambari as well as on the relevant KDC or
> Active Directory. Also the kdamin.log fills up with messages like:
> {noformat:title=/var/log/kadmind.log}
> Jun 29 14:31:42 some-host-1 kadmind[2383](Notice): Request: kadm5_init,
> admin/ad...@example.com, success, client=admin/ad...@example.com,
> service=kadmin/some-host-1.c.pramod-thangali.inter...@example.com,
> addr=10.240.70.128, vers=3, flavor=6
> Jun 29 14:31:42 some-host-1 kadmind[2383](Notice): Request:
> kadm5_get_principal, admin/ad...@example.com, success,
> client=admin/ad...@example.com,
> service=kadmin/some-host-1.c.pramod-thangali.inter...@example.com,
> addr=10.240.70.128
> Jun 29 14:31:42 some-host-1 kadmind[2383](info): closing down fd 29
> Jun 29 14:32:49 some-host-1 kadmind[2383](Notice): Request: kadm5_init,
> admin/ad...@example.com, success, client=admin/ad...@example.com,
> service=kadmin/some-host-1.c.pramod-thangali.inter...@example.com,
> addr=10.240.70.128, vers=3, flavor=6
> Jun 29 14:32:49 some-host-1 kadmind[2383](Notice): Request:
> kadm5_get_principal, admin/ad...@example.com, success,
> client=admin/ad...@example.com,
> service=kadmin/some-host-1.c.pramod-thangali.inter...@example.com,
> addr=10.240.70.128
> Jun 29 14:32:49 some-host-1 kadmind[2383](info): closing down fd 29
> Jun 29 14:34:35 some-host-1 kadmind[2383](Notice): Request: kadm5_init,
> admin/ad...@example.com, success, client=admin/ad...@example.com,
> service=kadmin/some-host-1.c.pramod-thangali.inter...@example.com,
> addr=10.240.70.128, vers=3, flavor=6
> Jun 29 14:34:35 some-host-1 kadmind[2383](Notice): Request:
> kadm5_get_principal, admin/ad...@example.com, success,
> client=admin/ad...@example.com,
> service=kadmin/some-host-1.c.pramod-thangali.inter...@example.com,
> addr=10.240.70.128
> Jun 29 14:34:35 some-host-1 kadmind[2383](info): closing down fd 29
> Jun 29 14:35:28 some-host-1 kadmind[2383](Notice): Request: kadm5_init,
> admin/ad...@example.com, success, client=admin/ad...@example.com,
> service=kadmin/some-host-1.c.pramod-thangali.inter...@example.com,
> addr=10.240.70.128, vers=3, flavor=6
> Jun 29 14:35:28 some-host-1 kadmind[2383](Notice): Request:
> kadm5_get_principal, admin/ad...@example.com, success,
> client=admin/ad...@example.com,
> service=kadmin/some-host-1.c.pramod-thangali.inter...@example.com,
> addr=10.240.70.128
> Jun 29 14:35:28 some-host-1 kadmind[2383](info): closing down fd 29
> {noformat}
> *Solution*
> Only query for the KDC attributes when explicitly or implicitly queried. This
> can be done by conditionally setting the relevant properties near
> {{org/apache/ambari/server/controller/internal/ServiceResourceProvider.java:1394}}
> by inspecting the request for relevant identifiers using something like the
> following:
> {code}
> requestedIds.contains(propertyId) || isPropertyCategoryRequested(propertyId,
> requestedIds);
> {code}
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