Indexes: CF MBeans for automatic indexes are never unregistered when they are 
deleted.
--------------------------------------------------------------------------------------

                 Key: CASSANDRA-1843
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1843
             Project: Cassandra
          Issue Type: Bug
    Affects Versions: 0.7.0 rc 1
            Reporter: Jon Hermes
            Assignee: Jon Hermes
            Priority: Minor
             Fix For: 0.7.0 rc 2


Add, delete, and add the same index and you should get a stacktrace to this 
effect:
{noformat}
java.lang.RuntimeException: javax.management.InstanceAlreadyExistsException: 
org.apache.cassandra.db:type=IndexColumnFamilies,keyspace=Keyspace1,columnfamily=Standard1.616765
  at 
org.apache.cassandra.db.ColumnFamilyStore.<init>(ColumnFamilyStore.java:259)
  at 
org.apache.cassandra.db.ColumnFamilyStore.createColumnFamilyStore(ColumnFamilyStore.java:447)
  at 
org.apache.cassandra.db.ColumnFamilyStore.addIndex(ColumnFamilyStore.java:304)
  at 
org.apache.cassandra.db.ColumnFamilyStore.reload(ColumnFamilyStore.java:193)
  at 
org.apache.cassandra.db.migration.UpdateColumnFamily.applyModels(UpdateColumnFamily.java:80)
  at org.apache.cassandra.db.migration.Migration.apply(Migration.java:171)
  at 
org.apache.cassandra.thrift.CassandraServer$2.call(CassandraServer.java:663)
  at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
  at java.util.concurrent.FutureTask.run(FutureTask.java:138)
  at 
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
  at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
  at java.lang.Thread.run(Thread.java:662)
Caused by: javax.management.InstanceAlreadyExistsException: 
org.apache.cassandra.db:type=IndexColumnFamilies,keyspace=Keyspace1,columnfamily=Standard1.616765
  at com.sun.jmx.mbeanserver.Repository.addMBean(Repository.java:453)
  at 
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.internal_addObject(DefaultMBeanServerInterceptor.java:1484)
  at 
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerDynamicMBean(DefaultMBeanServerInterceptor.java:963)
  at 
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerObject(DefaultMBeanServerInterceptor.java:917)
  at 
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerMBean(DefaultMBeanServerInterceptor.java:312)
  at 
com.sun.jmx.mbeanserver.JmxMBeanServer.registerMBean(JmxMBeanServer.java:482)
  at 
org.apache.cassandra.db.ColumnFamilyStore.<init>(ColumnFamilyStore.java:255)
  ... 11 more{noformat}
CFS.reload() manages index deletion, but never unregisters the MBeans it 
creates during initialization.

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