Upgrade Infra Solr Clients fails if it is installed on only one host

[root@santal-atlas-dc-upgr ~]# /usr/lib/ambari-infra-solr-client/ambariSolrMigration.sh --ini-file $CONFIG_INI_LOCATION --mode backup | tee backup_output.txt Execute command: /usr/bin/python /usr/lib/ambari-infra-solr-client/migrationHelper.py --ini-file ambari_solr_migration.ini --action check-shards Dumping collections data to /usr/lib/ambari-infra-solr-client/migrate/data/check_collections.json ... DONE Checking available shards for 'fulltext_index' collection... ------------------------------ Number of shards: 1 OK: Found active leader replica for shard1 Index size per shard for fulltext_index: - shard1: 71 bytes Index size per host for fulltext_index (consider this for backup): - 172.22.111.200: 71 bytes ------------------------------ Checking available shards for 'edge_index' collection... ------------------------------ Number of shards: 1 OK: Found active leader replica for shard1 Index size per shard for edge_index: - shard1: 71 bytes Index size per host for edge_index (consider this for backup): - 172.22.111.200: 71 bytes ------------------------------ Checking available shards for 'vertex_index' collection... ------------------------------ Number of shards: 1 OK: Found active leader replica for shard1 Index size per shard for vertex_index: - shard1: 16.8 KB Index size per host for vertex_index (consider this for backup): - 172.22.111.200: 16.8 KB ------------------------------ Full index size per hosts: (consider this for backup) - 172.22.111.200: 16.94 KB All warnings: 0 Check shards - PASSED ------------------------------ Command elapsed time: 00:00:03 ------------------------------ Migration helper command FINISHED Execute command: /usr/bin/python /usr/lib/ambari-infra-solr-client/migrationHelper.py --ini-file ambari_solr_migration.ini --action upgrade-solr-clients Sending upgrade request: [Upgrade Solr Clients] Traceback (most recent call last): File "/usr/lib/ambari-infra-solr-client/migrationHelper.py", line 2002, in <module> upgrade_solr_clients(options, accessor, parser, config) File "/usr/lib/ambari-infra-solr-client/migrationHelper.py", line 517, in upgrade_solr_clients response = post_json(accessor, CLUSTERS_URL.format(cluster) + REQUESTS_API_URL, cmd_request) File "/usr/lib/ambari-infra-solr-client/migrationHelper.py", line 250, in post_json response = accessor(url, 'POST', json.dumps(request_body)) File "/usr/lib/ambari-infra-solr-client/migrationHelper.py", line 117, in do_request raise Exception('Problem with accessing api. Reason: {0}'.format(exc)) Exception: Problem with accessing api. Reason: HTTP Error 500: Internal Server Error Total Runtime: 00:00:03 Upgrade Solr Clients command FAILED. Stop migration commands ...

Caused by: org.apache.ambari.server.ServiceComponentHostNotFoundException: ServiceComponentHost not found, clusterName=atlas_upgr_cl, serviceName=AMBARI_INFRA_SOLR, serviceComponentName=INFRA_SOLR_CLIENT, hostName=
        at org.apache.ambari.server.state.ServiceComponentImpl.getServiceComponentHost(ServiceComponentImpl.java:346)
        at org.apache.ambari.server.controller.MaintenanceStateHelper.isOperationAllowed(MaintenanceStateHelper.java:111)
        at org.apache.ambari.server.controller.MaintenanceStateHelper.isOperationAllowed(MaintenanceStateHelper.java:87)
        at org.apache.ambari.server.controller.AmbariCustomCommandExecutionHelper$1.shouldHostBeRemoved(AmbariCustomCommandExecutionHelper.java:287)
        at org.apache.ambari.server.controller.MaintenanceStateHelper.filterHostsInMaintenanceState(MaintenanceStateHelper.java:423)
        at org.apache.ambari.server.controller.AmbariCustomCommandExecutionHelper.addCustomCommandAction(AmbariCustomCommandExecutionHelper.java:278)
        at org.apache.ambari.server.controller.AmbariCustomCommandExecutionHelper.addExecutionCommandsToStage(AmbariCustomCommandExecutionHelper.java:1187)
        at org.apache.ambari.server.controller.AmbariManagementControllerImpl.createAction(AmbariManagementControllerImpl.java:4140)
        at org.apache.ambari.server.controller.internal.RequestResourceProvider$1.invoke(RequestResourceProvider.java:283)
        at org.apache.ambari.server.controller.internal.RequestResourceProvider$1.invoke(RequestResourceProvider.java:212)
        at org.apache.ambari.server.controller.internal.AbstractResourceProvider.invokeWithRetry(AbstractResourceProvider.java:465)
        at org.apache.ambari.server.controller.internal.AbstractResourceProvider.createResources(AbstractResourceProvider.java:288)