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https://issues.apache.org/jira/browse/AMBARI-21706?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16122515#comment-16122515
 ] 

Aravindan Vijayan commented on AMBARI-21706:
--------------------------------------------

Both the exception traces are seen because the server is getting a request from 
the UI with an unexpectedly empty host list.

In the Assign Masters page if the following call is made
{code}
http://<HOST>:8080/api/v1/hosts?Hosts/host_name.in()&fields=Hosts/cpu_count,Hosts/disk_info,Hosts/total_mem,Hosts/ip,Hosts/os_type,Hosts/os_arch,Hosts/public_host_name&minimal_response=true&_=1502392278264
{code}
it leads to the exception
{code}
10 Aug 2017 09:49:17,123 ERROR [ambari-client-thread-593] QueryParser:115 - 
Lowercase host_name value in expression failed with error:java.lang.NullPoi
nterException
10 Aug 2017 09:49:17,125 ERROR [ambari-client-thread-593] Request:147 - Unable 
to compile query predicate: IN operator is missing a required right operand.
{code}

and the if next /recommendations call has a request body with empty host list, 
it causes the second exception
{code}
java.lang.ClassCastException: java.util.LinkedHashSet cannot be cast to 
java.util.List
        at 
org.apache.ambari.server.controller.internal.StackAdvisorResourceProvider.prepareStackAdvisorRequest(StackAdvisorResourceProvider.java:110)
{code}
The UI call to get current 'hosts' in context is returning an empty list 
(ambari/ambari-web/app/mixins/wizard/assign_master_components.js:getHosts). Not 
able to reproduce this issue on 2 clusters.

> Cluster installation stuck on Customize Services Page
> -----------------------------------------------------
>
>                 Key: AMBARI-21706
>                 URL: https://issues.apache.org/jira/browse/AMBARI-21706
>             Project: Ambari
>          Issue Type: Bug
>          Components: ambari-server
>    Affects Versions: 2.5.2
>            Reporter: Aravindan Vijayan
>            Assignee: Aravindan Vijayan
>            Priority: Critical
>             Fix For: 2.6.0
>
>
> Cluster installation stuck on Customize Services Page and wasn't loaded even 
> after 4000 seconds waiting
> ambari-server.log shows:
> {code}
> 10 Aug 2017 09:48:08,356  INFO [pool-18-thread-1] AmbariMetricSinkImpl:95 - 
> No clusters configured.
> 10 Aug 2017 09:49:17,123 ERROR [ambari-client-thread-593] QueryParser:115 - 
> Lowercase host_name value in expression failed with 
> error:java.lang.NullPointerException
> 10 Aug 2017 09:49:17,125 ERROR [ambari-client-thread-593] Request:147 - 
> Unable to compile query predicate: IN operator is missing a required right 
> oper
> and.
> org.apache.ambari.server.api.predicate.InvalidQueryException: IN operator is 
> missing a required right operand.
>         at 
> org.apache.ambari.server.api.predicate.operators.InOperator.toPredicate(InOperator.java:50)
>         at 
> org.apache.ambari.server.api.predicate.expressions.RelationalExpression.toPredicate(RelationalExpression.java:43)
>         at 
> org.apache.ambari.server.api.predicate.QueryParser.parse(QueryParser.java:99)
>         at 
> org.apache.ambari.server.api.predicate.PredicateCompiler.compile(PredicateCompiler.java:62)
>         at 
> org.apache.ambari.server.api.services.BaseRequest.parseQueryPredicate(BaseRequest.java:344)
>         at 
> org.apache.ambari.server.api.services.BaseRequest.process(BaseRequest.java:143)
> {code}
> {code}
> 10 Aug 2017 09:49:17,126  WARN [ambari-client-thread-597] 
> AbstractResourceProvider:134 - Error occurred during preparation of stack 
> advisor request
> java.lang.ClassCastException: java.util.LinkedHashSet cannot be cast to 
> java.util.List
>         at 
> org.apache.ambari.server.controller.internal.StackAdvisorResourceProvider.prepareStackAdvisorRequest(StackAdvisorResourceProvider.java:110)
>         at 
> org.apache.ambari.server.controller.internal.RecommendationResourceProvider.createResources(RecommendationResourceProvider.java:88)
>         at 
> org.apache.ambari.server.controller.internal.ClusterControllerImpl.createResources(ClusterControllerImpl.java:298)
>         at 
> org.apache.ambari.server.api.services.persistence.PersistenceManagerImpl.create(PersistenceManagerImpl.java:97)
>         at 
> org.apache.ambari.server.api.handlers.CreateHandler.persist(CreateHandler.java:37)
>         at 
> org.apache.ambari.server.api.handlers.BaseManagementHandler.handleRequest(BaseManagementHandler.java:73)
>         at 
> org.apache.ambari.server.api.services.BaseRequest.process(BaseRequest.java:144)
> {code}



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