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https://reviews.apache.org/r/54912/
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Review request for Ambari, Nate Cole and Robert Levas.


Bugs: AMBARI-19259
    https://issues.apache.org/jira/browse/AMBARI-19259


Repository: ambari


Description
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When editing an alert group which has targets via the UI, sometimes the 
following is seen:

```
16 Nov 2016 11:09:49,343  WARN [qtp-ambari-client-510524] ServletHandler:563 - 
/api/v1/clusters/EHIHADOOP03/alert_groups/155
java.util.ConcurrentModificationException
        at java.util.HashMap$HashIterator.nextNode(HashMap.java:1429)
        at java.util.HashMap$KeyIterator.next(HashMap.java:1453)
        at 
org.eclipse.persistence.indirection.IndirectSet$1.next(IndirectSet.java:471)
        at 
org.apache.ambari.server.orm.entities.AlertGroupEntity.setAlertTargets(AlertGroupEntity.java:313)
        at 
org.apache.ambari.server.controller.internal.AlertGroupResourceProvider.updateAlertGroups(AlertGroupResourceProvider.java:344)
        at 
org.apache.ambari.server.controller.internal.AlertGroupResourceProvider.access$100(AlertGroupResourceProvider.java:60)
        at 
org.apache.ambari.server.controller.internal.AlertGroupResourceProvider$2.invoke(AlertGroupResourceProvider.java:187)
        at 
org.apache.ambari.server.controller.internal.AlertGroupResourceProvider$2.invoke(AlertGroupResourceProvider.java:184)
        at 
org.apache.ambari.server.controller.internal.AbstractResourceProvider.invokeWithRetry(AbstractResourceProvider.java:450)
        at 
org.apache.ambari.server.controller.internal.AbstractResourceProvider.modifyResources(AbstractResourceProvider.java:331)
```

The in-memory collection is not thread safe.


Diffs
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ambari-server/src/main/java/org/apache/ambari/server/orm/entities/AlertGroupEntity.java
 76c6b62 
  
ambari-server/src/main/java/org/apache/ambari/server/orm/entities/AlertTargetEntity.java
 9668210 
  
ambari-server/src/test/java/org/apache/ambari/server/orm/dao/AlertDispatchDAOTest.java
 87afb38 

Diff: https://reviews.apache.org/r/54912/diff/


Testing
-------

PENDING


Thanks,

Jonathan Hurley

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