zhangkewei opened a new issue #939: [collector] '/ by zero'  error in 
5.0.0-alpha
URL: https://github.com/apache/incubator-skywalking/issues/939
 
 
   Please answer these questions before submitting your issue.
   
   - Why do you submit this issue?
   - [ ] Question or discussion
   - [x ] Bug
   - [ ] Requirement
   - [ ] Feature or performance improvement
   
   ___
   ### Bug
   - Which version of SkyWalking, OS and JRE?
    SkyWalking?5.0.0-alpha
    JRE: 1.8.0_131
    OS: CentOS release 6.7 x64
   - What happen?
     
      In my application environment, I found that some collector api call with 
'java.lang.ArithmeticException: / by zero' error.
   
      /getServerResponseTimeTrend
      /getApplicationTopology
      /getClusterTopology
   
   
     
   ```
   The detail message is ?
   java.lang.ArithmeticException: / by zero
        at 
org.apache.skywalking.apm.collector.storage.es.dao.ui.InstanceMetricEsUIDAO.getResponseTimeTrend(InstanceMetricEsUIDAO.java:147)
 ~[collector-storage-es-provider-5.0.0-alpha.jar:5.0.0-alpha]
        at 
org.apache.skywalking.apm.collector.ui.service.ServerService.getServerResponseTimeTrend(ServerService.java:100)
 ~[collector-ui-jetty-provider-5.0.0-alpha.jar:5.0.0-alpha]
        at 
org.apache.skywalking.apm.collector.ui.query.ServerQuery.getServerResponseTimeTrend(ServerQuery.java:70)
 ~[collector-ui-jetty-provider-5.0.0-alpha.jar:5.0.0-alpha]
        at 
org.apache.skywalking.apm.collector.ui.query.ServerQueryMethodAccess.invoke(Unknown
 Source) ~[reflectasm-1.11.3.jar:5.0.0-alpha]
        at 
com.coxautodev.graphql.tools.MethodFieldResolverDataFetcher.get(MethodFieldResolver.kt:132)
 ~[graphql-java-tools-4.3.0.jar:?]
        at 
graphql.execution.ExecutionStrategy.fetchField(ExecutionStrategy.java:219) 
[graphql-java-6.0.jar:?]
        at 
graphql.execution.ExecutionStrategy.resolveField(ExecutionStrategy.java:165) 
[graphql-java-6.0.jar:?]
        at 
graphql.execution.AsyncExecutionStrategy.execute(AsyncExecutionStrategy.java:55)
 [graphql-java-6.0.jar:?]
        at graphql.execution.Execution.executeOperation(Execution.java:154) 
[graphql-java-6.0.jar:?]
        at graphql.execution.Execution.execute(Execution.java:98) 
[graphql-java-6.0.jar:?]
        at graphql.GraphQL.execute(GraphQL.java:546) [graphql-java-6.0.jar:?]
        at graphql.GraphQL.parseValidateAndExecute(GraphQL.java:488) 
[graphql-java-6.0.jar:?]
        at graphql.GraphQL.executeAsync(GraphQL.java:463) 
[graphql-java-6.0.jar:?]
        at graphql.GraphQL.execute(GraphQL.java:394) [graphql-java-6.0.jar:?]
        at 
org.apache.skywalking.apm.collector.ui.jetty.handler.GraphQLHandler.execute(GraphQLHandler.java:121)
 [collector-ui-jetty-provider-5.0.0-alpha.jar:5.0.0-alpha]
        at 
org.apache.skywalking.apm.collector.ui.jetty.handler.GraphQLHandler.doPost(GraphQLHandler.java:115)
 [collector-ui-jetty-provider-5.0.0-alpha.jar:5.0.0-alpha]
        at 
org.apache.skywalking.apm.collector.server.jetty.JettyHandler.doPost(JettyHandler.java:65)
 [server-component-5.0.0-alpha.jar:5.0.0-alpha]
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:707) 
[javax.servlet-api-3.1.0.jar:3.1.0]
        at 
org.apache.skywalking.apm.collector.server.jetty.JettyHandler.service(JettyHandler.java:112)
 [server-component-5.0.0-alpha.jar:5.0.0-alpha]
   ```
      

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