Darren Warner created CASSANDRA-8795:
----------------------------------------

             Summary: Cassandra (possibly under load) occasionally throws an 
exception during CQL create table
                 Key: CASSANDRA-8795
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8795
             Project: Cassandra
          Issue Type: Bug
            Reporter: Darren Warner


CQLSH will return the following:

{code}
{ name: 'ResponseError',
  message: 'java.lang.RuntimeException: 
java.util.concurrent.ExecutionException: java.lang.NullPointerException',
  info: 'Represents an error message from the server',
 code: 0,
 query: 'CREATE TABLE IF NOT EXISTS roles_by_users( userid TIMEUUID, role INT, 
entityid TIMEUUID, entity_type TEXT, enabled BOOLEAN, PRIMARY KEY (userid, 
role, entityid, entity_type) );' }
{code}

Cassandra system.log shows:
{code}
ERROR [MigrationStage:1] 2015-02-11 14:38:48,610 CassandraDaemon.java:153 - 
Exception in thread Thread[MigrationStage:1,5,main]
java.lang.NullPointerException: null
        at 
org.apache.cassandra.db.DefsTables.addColumnFamily(DefsTables.java:371) 
~[apache-cassandra-2.1.2.jar:2.1.2]
        at 
org.apache.cassandra.db.DefsTables.mergeColumnFamilies(DefsTables.java:293) 
~[apache-cassandra-2.1.2.jar:2.1.2]
        at 
org.apache.cassandra.db.DefsTables.mergeSchemaInternal(DefsTables.java:194) 
~[apache-cassandra-2.1.2.jar:2.1.2]
        at org.apache.cassandra.db.DefsTables.mergeSchema(DefsTables.java:166) 
~[apache-cassandra-2.1.2.jar:2.1.2]
        at 
org.apache.cassandra.service.MigrationManager$2.runMayThrow(MigrationManager.java:393)
 ~[apache-cassandra-2.1.2.jar:2.1.2]
        at 
org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28) 
~[apache-cassandra-2.1.2.jar:2.1.2]
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) 
~[na:1.8.0_31]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) 
~[na:1.8.0_31]
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
~[na:1.8.0_31]
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 
[na:1.8.0_31]
        at java.lang.Thread.run(Thread.java:745) [na:1.8.0_31]
ERROR [SharedPool-Worker-2] 2015-02-11 14:38:48,620 QueryMessage.java:132 - 
Unexpected error during query
java.lang.RuntimeException: java.util.concurrent.ExecutionException: 
java.lang.NullPointerException
        at 
org.apache.cassandra.utils.FBUtilities.waitOnFuture(FBUtilities.java:398) 
~[apache-cassandra-2.1.2.jar:2.1.2]
        at 
org.apache.cassandra.service.MigrationManager.announce(MigrationManager.java:374)
 ~[apache-cassandra-2.1.2.jar:2.1.2]
        at 
org.apache.cassandra.service.MigrationManager.announceNewColumnFamily(MigrationManager.java:249)
 ~[apache-cassandra-2.1.2.jar:2.1.2]
        at 
org.apache.cassandra.cql3.statements.CreateTableStatement.announceMigration(CreateTableStatement.java:113)
 ~[apache-cassandra-2.1.2.jar:2.1.2]
        at 
org.apache.cassandra.cql3.statements.SchemaAlteringStatement.execute(SchemaAlteringStatement.java:80)
 ~[apache-cassandra-2.1.2.jar:2.1.2]
        at 
org.apache.cassandra.cql3.QueryProcessor.processStatement(QueryProcessor.java:226)
 ~[apache-cassandra-2.1.2.jar:2.1.2]
        at 
org.apache.cassandra.cql3.QueryProcessor.process(QueryProcessor.java:248) 
~[apache-cassandra-2.1.2.jar:2.1.2]
        at 
org.apache.cassandra.transport.messages.QueryMessage.execute(QueryMessage.java:119)
 ~[apache-cassandra-2.1.2.jar:2.1.2]
        at 
org.apache.cassandra.transport.Message$Dispatcher.channelRead0(Message.java:439)
 [apache-cassandra-2.1.2.jar:2.1.2]
        at 
org.apache.cassandra.transport.Message$Dispatcher.channelRead0(Message.java:335)
 [apache-cassandra-2.1.2.jar:2.1.2]
        at 
io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105)
 [netty-all-4.0.23.Final.jar:4.0.23.Final]
        at 
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333)
 [netty-all-4.0.23.Final.jar:4.0.23.Final]
        at 
io.netty.channel.AbstractChannelHandlerContext.access$700(AbstractChannelHandlerContext.java:32)
 [netty-all-4.0.23.Final.jar:4.0.23.Final]
        at 
io.netty.channel.AbstractChannelHandlerContext$8.run(AbstractChannelHandlerContext.java:324)
 [netty-all-4.0.23.Final.jar:4.0.23.Final]
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) 
[na:1.8.0_31]
        at 
org.apache.cassandra.concurrent.AbstractTracingAwareExecutorService$FutureTask.run(AbstractTracingAwareExecutorService.java:164)
 [apache-cassandra-2.1.2.jar:2.1.2]
        at org.apache.cassandra.concurrent.SEPWorker.run(SEPWorker.java:105) 
[apache-cassandra-2.1.2.jar:2.1.2]
        at java.lang.Thread.run(Thread.java:745) [na:1.8.0_31]
Caused by: java.util.concurrent.ExecutionException: 
java.lang.NullPointerException
        at java.util.concurrent.FutureTask.report(FutureTask.java:122) 
~[na:1.8.0_31]
        at java.util.concurrent.FutureTask.get(FutureTask.java:192) 
~[na:1.8.0_31]
        at 
org.apache.cassandra.utils.FBUtilities.waitOnFuture(FBUtilities.java:394) 
~[apache-cassandra-2.1.2.jar:2.1.2]
        ... 17 common frames omitted
Caused by: java.lang.NullPointerException: null
        at 
org.apache.cassandra.db.DefsTables.addColumnFamily(DefsTables.java:371) 
~[apache-cassandra-2.1.2.jar:2.1.2]
        at 
org.apache.cassandra.db.DefsTables.mergeColumnFamilies(DefsTables.java:293) 
~[apache-cassandra-2.1.2.jar:2.1.2]
        at 
org.apache.cassandra.db.DefsTables.mergeSchemaInternal(DefsTables.java:194) 
~[apache-cassandra-2.1.2.jar:2.1.2]
        at org.apache.cassandra.db.DefsTables.mergeSchema(DefsTables.java:166) 
~[apache-cassandra-2.1.2.jar:2.1.2]
        at 
org.apache.cassandra.service.MigrationManager$2.runMayThrow(MigrationManager.java:393)
 ~[apache-cassandra-2.1.2.jar:2.1.2]
        at 
org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28) 
~[apache-cassandra-2.1.2.jar:2.1.2]
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) 
[na:1.8.0_31]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) 
~[na:1.8.0_31]
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
~[na:1.8.0_31]
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 
~[na:1.8.0_31]
        ... 1 common frames omitted
ERROR [SharedPool-Worker-2] 2015-02-11 14:38:48,621 ErrorMessage.java:243 - 
Unexpected exception during request
java.lang.RuntimeException: java.util.concurrent.ExecutionException: 
java.lang.NullPointerException
        at 
org.apache.cassandra.utils.FBUtilities.waitOnFuture(FBUtilities.java:398) 
~[apache-cassandra-2.1.2.jar:2.1.2]
        at 
org.apache.cassandra.service.MigrationManager.announce(MigrationManager.java:374)
 ~[apache-cassandra-2.1.2.jar:2.1.2]
        at 
org.apache.cassandra.service.MigrationManager.announceNewColumnFamily(MigrationManager.java:249)
 ~[apache-cassandra-2.1.2.jar:2.1.2]
        at 
org.apache.cassandra.cql3.statements.CreateTableStatement.announceMigration(CreateTableStatement.java:113)
 ~[apache-cassandra-2.1.2.jar:2.1.2]
        at 
org.apache.cassandra.cql3.statements.SchemaAlteringStatement.execute(SchemaAlteringStatement.java:80)
 ~[apache-cassandra-2.1.2.jar:2.1.2]
        at 
org.apache.cassandra.cql3.QueryProcessor.processStatement(QueryProcessor.java:226)
 ~[apache-cassandra-2.1.2.jar:2.1.2]
        at 
org.apache.cassandra.cql3.QueryProcessor.process(QueryProcessor.java:248) 
~[apache-cassandra-2.1.2.jar:2.1.2]
        at 
org.apache.cassandra.transport.messages.QueryMessage.execute(QueryMessage.java:119)
 ~[apache-cassandra-2.1.2.jar:2.1.2]
        at 
org.apache.cassandra.transport.Message$Dispatcher.channelRead0(Message.java:439)
 [apache-cassandra-2.1.2.jar:2.1.2]
        at 
org.apache.cassandra.transport.Message$Dispatcher.channelRead0(Message.java:335)
 [apache-cassandra-2.1.2.jar:2.1.2]
        at 
io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105)
 [netty-all-4.0.23.Final.jar:4.0.23.Final]
        at 
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333)
 [netty-all-4.0.23.Final.jar:4.0.23.Final]
        at 
io.netty.channel.AbstractChannelHandlerContext.access$700(AbstractChannelHandlerContext.java:32)
 [netty-all-4.0.23.Final.jar:4.0.23.Final]
        at 
io.netty.channel.AbstractChannelHandlerContext$8.run(AbstractChannelHandlerContext.java:324)
 [netty-all-4.0.23.Final.jar:4.0.23.Final]
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) 
[na:1.8.0_31]
        at 
org.apache.cassandra.concurrent.AbstractTracingAwareExecutorService$FutureTask.run(AbstractTracingAwareExecutorService.java:164)
 [apache-cassandra-2.1.2.jar:2.1.2]
        at org.apache.cassandra.concurrent.SEPWorker.run(SEPWorker.java:105) 
[apache-cassandra-2.1.2.jar:2.1.2]
        at java.lang.Thread.run(Thread.java:745) [na:1.8.0_31]
Caused by: java.util.concurrent.ExecutionException: 
java.lang.NullPointerException
        at java.util.concurrent.FutureTask.report(FutureTask.java:122) 
~[na:1.8.0_31]
        at java.util.concurrent.FutureTask.get(FutureTask.java:192) 
~[na:1.8.0_31]
        at 
org.apache.cassandra.utils.FBUtilities.waitOnFuture(FBUtilities.java:394) 
~[apache-cassandra-2.1.2.jar:2.1.2]
        ... 17 common frames omitted
Caused by: java.lang.NullPointerException: null
        at 
org.apache.cassandra.db.DefsTables.addColumnFamily(DefsTables.java:371) 
~[apache-cassandra-2.1.2.jar:2.1.2]
        at 
org.apache.cassandra.db.DefsTables.mergeColumnFamilies(DefsTables.java:293) 
~[apache-cassandra-2.1.2.jar:2.1.2]
        at 
org.apache.cassandra.db.DefsTables.mergeSchemaInternal(DefsTables.java:194) 
~[apache-cassandra-2.1.2.jar:2.1.2]
        at org.apache.cassandra.db.DefsTables.mergeSchema(DefsTables.java:166) 
~[apache-cassandra-2.1.2.jar:2.1.2]
        at 
org.apache.cassandra.service.MigrationManager$2.runMayThrow(MigrationManager.java:393)
 ~[apache-cassandra-2.1.2.jar:2.1.2]
        at 
org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28) 
~[apache-cassandra-2.1.2.jar:2.1.2]
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) 
[na:1.8.0_31]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) 
~[na:1.8.0_31]
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
~[na:1.8.0_31]
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 
~[na:1.8.0_31]
        ... 1 common frames omitted
{code}





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