Add some clue: 

17 May 2018 16:17:33,861 ERROR [ambari-client-thread-233] Request:147 - Unable 
to compile query predicate: Unexpected token encountered in query string. Last 
Token Type=PROPERTY_OPERAND, Cur 
rent Token[type=LOGICAL_OPERATOR, value='&'] 
org.apache.ambari.server.api.predicate.InvalidQueryException: Unexpected token 
encountered in query string. Last Token Type=PROPERTY_OPERAND, Current 
Token[type=LOGICAL_OPERATOR, value='&'] 
at 
org.apache.ambari.server.api.predicate.QueryParser$TokenHandler.handleToken(QueryParser.java:351)
 


From: "xiang dai" <xiang....@sky-data.cn> 
To: "user" <user@ambari.apache.org> 
Sent: Thursday, May 17, 2018 10:27:23 AM 
Subject: Operating System matching redhat7 could not be found 

Hi! 

I met a confused issue: 
when i use vagrant to test, all work. 
when i change to my hosts, below waring show: 
org.apache.ambari.server.controller.spi.SystemException: Operating System 
matching redhat7 could not be found 

And UI hang. 

The question is that both VM and hosts are Centos7, why behave differently? 

Thanks 

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