Gábor Auth created CASSANDRA-13346:
--------------------------------------

             Summary: Failed unregistering mbean during drop keyspace
                 Key: CASSANDRA-13346
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13346
             Project: Cassandra
          Issue Type: Bug
         Environment: Cassandra 3.9
            Reporter: Gábor Auth
            Priority: Minor


All node throw exceptions about materialized views during drop keyspace:
{code}

WARN  [MigrationStage:1] 2017-03-16 16:54:25,016 ColumnFamilyStore.java:535 - 
Failed unregistering mbean: 
org.apache.cassandra.db:type=Tables,keyspace=test20160810,table=unit_by_account
java.lang.NullPointerException: null
        at 
java.util.concurrent.ConcurrentHashMap.replaceNode(ConcurrentHashMap.java:1106) 
~[na:1.8.0_121]
        at 
java.util.concurrent.ConcurrentHashMap.remove(ConcurrentHashMap.java:1097) 
~[na:1.8.0_121]
        at 
java.util.concurrent.ConcurrentHashMap$KeySetView.remove(ConcurrentHashMap.java:4569)
 ~[na:1.8.0_121]
        at 
org.apache.cassandra.metrics.TableMetrics.release(TableMetrics.java:712) 
~[apache-cassandra-3.9.0.jar:3.9.0]
        at 
org.apache.cassandra.db.ColumnFamilyStore.unregisterMBean(ColumnFamilyStore.java:570)
 [apache-cassandra-3.9.0.jar:3.9.0]
        at 
org.apache.cassandra.db.ColumnFamilyStore.invalidate(ColumnFamilyStore.java:527)
 [apache-cassandra-3.9.0.jar:3.9.0]
        at 
org.apache.cassandra.db.ColumnFamilyStore.invalidate(ColumnFamilyStore.java:517)
 [apache-cassandra-3.9.0.jar:3.9.0]
        at org.apache.cassandra.db.Keyspace.unloadCf(Keyspace.java:365) 
[apache-cassandra-3.9.0.jar:3.9.0]
        at org.apache.cassandra.db.Keyspace.dropCf(Keyspace.java:358) 
[apache-cassandra-3.9.0.jar:3.9.0]
        at org.apache.cassandra.config.Schema.dropView(Schema.java:744) 
[apache-cassandra-3.9.0.jar:3.9.0]
        at 
org.apache.cassandra.schema.SchemaKeyspace.lambda$mergeSchema$373(SchemaKeyspace.java:1287)
 [apache-cassandra-3.9.0.jar:3.9.0]
        at java.lang.Iterable.forEach(Iterable.java:75) ~[na:1.8.0_121]
        at 
org.apache.cassandra.schema.SchemaKeyspace.mergeSchema(SchemaKeyspace.java:1287)
 [apache-cassandra-3.9.0.jar:3.9.0]
        at 
org.apache.cassandra.schema.SchemaKeyspace.mergeSchemaAndAnnounceVersion(SchemaKeyspace.java:1256)
 [apache-cassandra-3.9.0.jar:3.9.0]
        at 
org.apache.cassandra.db.DefinitionsUpdateVerbHandler$1.runMayThrow(DefinitionsUpdateVerbHandler.java:51)
 ~[apache-cassandra-3.9.0.jar:3.9.0]
        at 
org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28) 
~[apache-cassandra-3.9.0.jar:3.9.0]
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) 
~[na:1.8.0_121]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) 
~[na:1.8.0_121]
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
~[na:1.8.0_121]
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 
~[na:1.8.0_121]
        at java.lang.Thread.run(Thread.java:745) ~[na:1.8.0_121]
{code}




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