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From "Alejandro Fernandez" <afernan...@hortonworks.com>
Subject Re: Review Request 27050: Rest API Null Pointer Exception for non-existent host in HostRoles/host_name filter for host_components.
Date Thu, 23 Oct 2014 02:30:51 GMT

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This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/27050/#review57961
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ambari-server/src/main/java/org/apache/ambari/server/state/cluster/ClustersImpl.java
<https://reviews.apache.org/r/27050/#comment98872>

    What are the implications of this?
    This function is called in several places, HeartBeartHandler, HeartbeatMonitor, ConfigHelper,
 etc.
    
    What led to the non-existent host being called in getHostComponents?


- Alejandro Fernandez


On Oct. 22, 2014, 8:23 p.m., Ritesh Jaltare wrote:
> 
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> This is an automatically generated e-mail. To reply, visit:
> https://reviews.apache.org/r/27050/
> -----------------------------------------------------------
> 
> (Updated Oct. 22, 2014, 8:23 p.m.)
> 
> 
> Review request for Ambari.
> 
> 
> Bugs: AMBARI-6700
>     https://issues.apache.org/jira/browse/AMBARI-6700
> 
> 
> Repository: ambari
> 
> 
> Description
> -------
> 
> Supplying a non-existent host in the hostRole/host_name filter to the host_components
end point in the Ambari API results in a "500 Server Error" to the client and a Null Pointer
Exception in the logs. 
> 
> FIX:
> 
> Modify ClustersImpl.getClustersForHost to throw a HostNotFoundException for a non existent
host.  
> 
> LOG:
> 
> 
> 16:51:11,033  WARN [qtp2101150571-448] ServletHandler:514 - /api/v1/clusters/PoC/host_components
> java.lang.NullPointerException
>         at java.util.Collections$UnmodifiableCollection.<init>(Collections.java:1051)
>         at java.util.Collections$UnmodifiableSet.<init>(Collections.java:1122)
>         at java.util.Collections.unmodifiableSet(Collections.java:1112)
>         at org.apache.ambari.server.state.cluster.ClustersImpl.getClustersForHost(ClustersImpl.java:260)
>         at org.apache.ambari.server.controller.AmbariManagementControllerImpl.getHostComponents(AmbariManagementControllerImpl.java:737)
>         at org.apache.ambari.server.controller.AmbariManagementControllerImpl.getHostComponents(AmbariManagementControllerImpl.java:2364)
>         
>         
>         
>         
>         
> 
> 
> Diffs
> -----
> 
>   ambari-server/src/main/java/org/apache/ambari/server/state/cluster/ClustersImpl.java
a57e9c2 
>   ambari-server/src/test/java/org/apache/ambari/server/state/cluster/ClustersTest.java
2baa5c5 
> 
> Diff: https://reviews.apache.org/r/27050/diff/
> 
> 
> Testing
> -------
> 
> Modified a test case testClusterHostMapping in ClustersTest.java which tests the particular
scenario for passing an invalid hostname to ClustersImpl.getClustersForHost. 
> 
> 
> Thanks,
> 
> Ritesh Jaltare
> 
>


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