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https://issues.apache.org/jira/browse/CASSANDRA-13346?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15954566#comment-15954566
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Gábor Auth commented on CASSANDRA-13346:
----------------------------------------

[~jjirsa]: yes, as I mentioned in the description: "All node throw exceptions 
about materialized views during drop keyspace". :)

> 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
>              Labels: lhf
>
> 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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