Hi,

We use a four-node Cassandra-Cluster in Version 2.1.2. Our Client-Applications creates Tables dynamically. At one point two (or more) of our Clients connected to two (or more) different Cassandra-Nodes will create the same table simultaneously. We get the "Column family ID mismatch"-Error-Messages on every node. Why is this simultanous schema modification not possible? How can we handle this? Every Help is appreciated.

The lengthy Error-Messages from two nodes follows:

On Node1 we got:

INFO [SharedPool-Worker-2] 2014-11-26 13:37:28,987 MigrationManager.java:248 - Create new ColumnFamily: org.apache.cassandra.config.CFMetaData@7edad3a3[cfId=fbd24eb0-7568-11e4-bd04-b3ae3abaeff4,ksName=myplayground,cfName=test_table, INFO [MigrationStage:1] 2014-11-26 13:37:29,607 DefsTables.java:373 - Loading org.apache.cassandra.config.CFMetaData@7adc8efd[cfId=fbd24eb0-7568-11e4-bd04-b3ae3abaeff4,ksName=myplayground,cfName=test_table, INFO [MigrationStage:1] 2014-11-26 13:37:29,629 ColumnFamilyStore.java:284 - Initializing myplayground.test_table ERROR [MigrationStage:1] 2014-11-26 13:37:30,282 CassandraDaemon.java:153 - Exception in thread Thread[MigrationStage:1,5,main] java.lang.RuntimeException: org.apache.cassandra.exceptions.ConfigurationException: Column family ID mismatch ( found fbd275c0-7568-11e4-b9ea-3934eddce895; expected fbd24eb0-7568-11e4-bd04-b3ae3abaeff4) at org.apache.cassandra.config.CFMetaData.reload(CFMetaData.java:1171) ~[apache-cassandra-2.1.1.jar:2.1.1] at org.apache.cassandra.db.DefsTables.updateColumnFamily(DefsTables.java:422) ~[apache-cassandra-2.1.1.jar:2.1.1] at org.apache.cassandra.db.DefsTables.mergeColumnFamilies(DefsTables.java:295) ~[apache-cassandra-2.1.1.jar:2.1.1] at org.apache.cassandra.db.DefsTables.mergeSchemaInternal(DefsTables.java:194) ~[apache-cassandra-2.1.1.jar:2.1.1] at org.apache.cassandra.db.DefsTables.mergeSchema(DefsTables.java:166) ~[apache-cassandra-2.1.1.jar:2.1.1] at org.apache.cassandra.db.DefinitionsUpdateVerbHandler$1.runMayThrow(DefinitionsUpdateVerbHandler.java:49) ~[apache-cassandra-2.1.1.jar:2.1.1] at org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28) ~[apache-cassandra-2.1.1.jar:2.1.1] at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[na:1.8.0_25] at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[na:1.8.0_25] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[na:1.8.0_25] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_25]
        at java.lang.Thread.run(Thread.java:745) [na:1.8.0_25]
Caused by: org.apache.cassandra.exceptions.ConfigurationException: Column family ID mismatch (found fbd275c0-7568-11e4-b9ea-3934eddce895; expected fbd24eb0-7568-11e4-bd04-b3ae3abaeff4) at org.apache.cassandra.config.CFMetaData.validateCompatility(CFMetaData.java:1254) ~[apache-cassandra-2.1.1.jar:2.1.1] at org.apache.cassandra.config.CFMetaData.apply(CFMetaData.java:1186) ~[apache-cassandra-2.1.1.jar:2.1.1] at org.apache.cassandra.config.CFMetaData.reload(CFMetaData.java:1167) ~[apache-cassandra-2.1.1.jar:2.1.1]
        ... 11 common frames omitted

On Node2 we got:

INFO [SharedPool-Worker-1] 2014-11-26 13:37:28,989 MigrationManager.java:248 - Create new ColumnFamily: org.apache.cassandra.config.CFMetaData@16d0bc0d[cfId=fbd275c0-7568-11e4-b9ea-3934eddce895,ksName=myplayground,cfName=test_table, INFO [MigrationStage:1] 2014-11-26 13:37:29,539 DefsTables.java:373 - Loading org.apache.cassandra.config.CFMetaData@3777e24b[cfId=fbd24eb0-7568-11e4-bd04-b3ae3abaeff4,ksName=myplayground,cfName=test_table, INFO [MigrationStage:1] 2014-11-26 13:37:29,541 ColumnFamilyStore.java:284 - Initializing myplayground.test_table ERROR [SharedPool-Worker-1] 2014-11-26 13:37:29,984 QueryMessage.java:130 - Unexpected error during query java.lang.RuntimeException: java.util.concurrent.ExecutionException: java.lang.RuntimeException: org.apache.cassandra.exceptions.ConfigurationException: Column family ID mismatch ( found fbd275c0-7568-11e4-b9ea-3934eddce895; expected fbd24eb0-7568-11e4-bd04-b3ae3abaeff4) at org.apache.cassandra.utils.FBUtilities.waitOnFuture(FBUtilities.java:397) ~[apache-cassandra-2.1.1.jar:2.1.1] at org.apache.cassandra.service.MigrationManager.announce(MigrationManager.java:374) ~[apache-cassandra-2.1.1.jar:2.1.1] at org.apache.cassandra.service.MigrationManager.announceNewColumnFamily(MigrationManager.java:249) ~[apache-cassandra-2.1.1.jar:2.1.1] at org.apache.cassandra.cql3.statements.CreateTableStatement.announceMigration(CreateTableStatement.java:114) ~[apache-cassandra-2.1.1.jar:2.1.1] at org.apache.cassandra.cql3.statements.SchemaAlteringStatement.execute(SchemaAlteringStatement.java:80) ~[apache-cassandra-2.1.1.jar:2.1.1] at org.apache.cassandra.cql3.QueryProcessor.processStatement(QueryProcessor.java:226) ~[apache-cassandra-2.1.1.jar:2.1.1] at org.apache.cassandra.cql3.QueryProcessor.process(QueryProcessor.java:248) ~[apache-cassandra-2.1.1.jar:2.1.1] at org.apache.cassandra.transport.messages.QueryMessage.execute(QueryMessage.java:118) ~[apache-cassandra-2.1.1.jar:2.1.1] at org.apache.cassandra.transport.Message$Dispatcher.channelRead0(Message.java:439) [apache-cassandra-2.1.1.jar:2.1.1] at org.apache.cassandra.transport.Message$Dispatcher.channelRead0(Message.java:335) [apache-cassandra-2.1.1.jar:2.1.1] 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_25] at org.apache.cassandra.concurrent.AbstractTracingAwareExecutorService$FutureTask.run(AbstractTracingAwareExecutorService.java:164) [apache-cassandra-2.1.1.jar:2.1.1] at org.apache.cassandra.concurrent.SEPWorker.run(SEPWorker.java:105) [apache-cassandra-2.1.1.jar:2.1.1]
        at java.lang.Thread.run(Thread.java:745) [na:1.8.0_25]
Caused by: java.util.concurrent.ExecutionException: java.lang.RuntimeException: org.apache.cassandra.exceptions.ConfigurationException: Column family ID mismatch (found fbd275c0-7568-11e4-b9ea-3934eddce895; expected fbd24eb0-7568-11e4-bd04-b3ae3abaeff4) at java.util.concurrent.FutureTask.report(FutureTask.java:122) ~[na:1.8.0_25] at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[na:1.8.0_25] at org.apache.cassandra.utils.FBUtilities.waitOnFuture(FBUtilities.java:393) ~[apache-cassandra-2.1.1.jar:2.1.1]
        ... 17 common frames omitted
Caused by: java.lang.RuntimeException: org.apache.cassandra.exceptions.ConfigurationException: Column family ID mismatch (found fbd275c0-7568-11e4-b9ea-3934eddce895; expected fbd24eb0-7568-11e4-bd04-b3ae3abaeff4) at org.apache.cassandra.config.CFMetaData.reload(CFMetaData.java:1171) ~[apache-cassandra-2.1.1.jar:2.1.1] at org.apache.cassandra.db.DefsTables.updateColumnFamily(DefsTables.java:422) ~[apache-cassandra-2.1.1.jar:2.1.1] at org.apache.cassandra.db.DefsTables.mergeColumnFamilies(DefsTables.java:295) ~[apache-cassandra-2.1.1.jar:2.1.1] at org.apache.cassandra.db.DefsTables.mergeSchemaInternal(DefsTables.java:194) ~[apache-cassandra-2.1.1.jar:2.1.1] at org.apache.cassandra.db.DefsTables.mergeSchema(DefsTables.java:166) ~[apache-cassandra-2.1.1.jar:2.1.1] at org.apache.cassandra.service.MigrationManager$2.runMayThrow(MigrationManager.java:393) ~[apache-cassandra-2.1.1.jar:2.1.1] at org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28) ~[apache-cassandra-2.1.1.jar:2.1.1] at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_25] at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[na:1.8.0_25] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[na:1.8.0_25] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ~[na:1.8.0_25]
        ... 1 common frames omitted
Caused by: org.apache.cassandra.exceptions.ConfigurationException: Column family ID mismatch (found fbd275c0-7568-11e4-b9ea-3934eddce895; expected fbd24eb0-7568-11e4-bd04-b3ae3abaeff4) at org.apache.cassandra.config.CFMetaData.validateCompatility(CFMetaData.java:1254) ~[apache-cassandra-2.1.1.jar:2.1.1] at org.apache.cassandra.config.CFMetaData.apply(CFMetaData.java:1186) ~[apache-cassandra-2.1.1.jar:2.1.1] at org.apache.cassandra.config.CFMetaData.reload(CFMetaData.java:1167) ~[apache-cassandra-2.1.1.jar:2.1.1]
        ... 11 common frames omitted
ERROR [MigrationStage:1] 2014-11-26 13:37:29,984 CassandraDaemon.java:153 - Exception in thread Thread[MigrationStage:1,5,main] java.lang.RuntimeException: org.apache.cassandra.exceptions.ConfigurationException: Column family ID mismatch ( found fbd275c0-7568-11e4-b9ea-3934eddce895; expected fbd24eb0-7568-11e4-bd04-b3ae3abaeff4) at org.apache.cassandra.config.CFMetaData.reload(CFMetaData.java:1171) ~[apache-cassandra-2.1.1.jar:2.1.1] at org.apache.cassandra.db.DefsTables.updateColumnFamily(DefsTables.java:422) ~[apache-cassandra-2.1.1.jar:2.1.1] at org.apache.cassandra.db.DefsTables.mergeColumnFamilies(DefsTables.java:295) ~[apache-cassandra-2.1.1.jar:2.1.1] at org.apache.cassandra.db.DefsTables.mergeSchemaInternal(DefsTables.java:194) ~[apache-cassandra-2.1.1.jar:2.1.1] at org.apache.cassandra.db.DefsTables.mergeSchema(DefsTables.java:166) ~[apache-cassandra-2.1.1.jar:2.1.1] at org.apache.cassandra.service.MigrationManager$2.runMayThrow(MigrationManager.java:393) ~[apache-cassandra-2.1.1.jar:2.1.1] at org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28) ~[apache-cassandra-2.1.1.jar:2.1.1] at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[na:1.8.0_25] at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[na:1.8.0_25] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[na:1.8.0_25] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_25]
        at java.lang.Thread.run(Thread.java:745) [na:1.8.0_25]
Caused by: org.apache.cassandra.exceptions.ConfigurationException: Column family ID mismatch (found fbd275c0-7568-11e4-b9ea-3934eddce895; expected fbd24eb0-7568-11e4-bd04-b3ae3abaeff4) at org.apache.cassandra.config.CFMetaData.validateCompatility(CFMetaData.java:1254) ~[apache-cassandra-2.1.1.jar:2.1.1] at org.apache.cassandra.config.CFMetaData.apply(CFMetaData.java:1186) ~[apache-cassandra-2.1.1.jar:2.1.1] at org.apache.cassandra.config.CFMetaData.reload(CFMetaData.java:1167) ~[apache-cassandra-2.1.1.jar:2.1.1]
        ... 11 common frames omitted
ERROR [SharedPool-Worker-1] 2014-11-26 13:37:29,985 ErrorMessage.java:243 - Unexpected exception during request java.lang.RuntimeException: java.util.concurrent.ExecutionException: java.lang.RuntimeException: org.apache.cassandra.exceptions.ConfigurationException: Column family ID mismatch ( found fbd275c0-7568-11e4-b9ea-3934eddce895; expected fbd24eb0-7568-11e4-bd04-b3ae3abaeff4) at org.apache.cassandra.utils.FBUtilities.waitOnFuture(FBUtilities.java:397) ~[apache-cassandra-2.1.1.jar:2.1.1] at org.apache.cassandra.service.MigrationManager.announce(MigrationManager.java:374) ~[apache-cassandra-2.1.1.jar:2.1.1] at org.apache.cassandra.service.MigrationManager.announceNewColumnFamily(MigrationManager.java:249) ~[apache-cassandra-2.1.1.jar:2.1.1] at org.apache.cassandra.cql3.statements.CreateTableStatement.announceMigration(CreateTableStatement.java:114) ~[apache-cassandra-2.1.1.jar:2.1.1] at org.apache.cassandra.cql3.statements.SchemaAlteringStatement.execute(SchemaAlteringStatement.java:80) ~[apache-cassandra-2.1.1.jar:2.1.1] at org.apache.cassandra.cql3.QueryProcessor.processStatement(QueryProcessor.java:226) ~[apache-cassandra-2.1.1.jar:2.1.1] at org.apache.cassandra.cql3.QueryProcessor.process(QueryProcessor.java:248) ~[apache-cassandra-2.1.1.jar:2.1.1] at org.apache.cassandra.transport.messages.QueryMessage.execute(QueryMessage.java:118) ~[apache-cassandra-2.1.1.jar:2.1.1] at org.apache.cassandra.transport.Message$Dispatcher.channelRead0(Message.java:439) [apache-cassandra-2.1.1.jar:2.1.1] at org.apache.cassandra.transport.Message$Dispatcher.channelRead0(Message.java:335) [apache-cassandra-2.1.1.jar:2.1.1] 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_25] at org.apache.cassandra.concurrent.AbstractTracingAwareExecutorService$FutureTask.run(AbstractTracingAwareExecutorService.java:164) [apache-cassandra-2.1.1.jar:2.1.1] at org.apache.cassandra.concurrent.SEPWorker.run(SEPWorker.java:105) [apache-cassandra-2.1.1.jar:2.1.1]
        at java.lang.Thread.run(Thread.java:745) [na:1.8.0_25]
Caused by: java.util.concurrent.ExecutionException: java.lang.RuntimeException: org.apache.cassandra.exceptions.ConfigurationException: Column family ID mismatch (found fbd275c0-7568-11e4-b9ea-3934eddce895; expected fbd24eb0-7568-11e4-bd04-b3ae3abaeff4) at java.util.concurrent.FutureTask.report(FutureTask.java:122) ~[na:1.8.0_25] at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[na:1.8.0_25] at org.apache.cassandra.utils.FBUtilities.waitOnFuture(FBUtilities.java:393) ~[apache-cassandra-2.1.1.jar:2.1.1]
        ... 17 common frames omitted
Caused by: java.lang.RuntimeException: org.apache.cassandra.exceptions.ConfigurationException: Column family ID mismatch (found fbd275c0-7568-11e4-b9ea-3934eddce895; expected fbd24eb0-7568-11e4-bd04-b3ae3abaeff4) at org.apache.cassandra.config.CFMetaData.reload(CFMetaData.java:1171) ~[apache-cassandra-2.1.1.jar:2.1.1] at org.apache.cassandra.db.DefsTables.updateColumnFamily(DefsTables.java:422) ~[apache-cassandra-2.1.1.jar:2.1.1] at org.apache.cassandra.db.DefsTables.mergeColumnFamilies(DefsTables.java:295) ~[apache-cassandra-2.1.1.jar:2.1.1] at org.apache.cassandra.db.DefsTables.mergeSchemaInternal(DefsTables.java:194) ~[apache-cassandra-2.1.1.jar:2.1.1] at org.apache.cassandra.db.DefsTables.mergeSchema(DefsTables.java:166) ~[apache-cassandra-2.1.1.jar:2.1.1] at org.apache.cassandra.service.MigrationManager$2.runMayThrow(MigrationManager.java:393) ~[apache-cassandra-2.1.1.jar:2.1.1] at org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28) ~[apache-cassandra-2.1.1.jar:2.1.1] at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_25] at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[na:1.8.0_25] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[na:1.8.0_25] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ~[na:1.8.0_25]
        ... 1 common frames omitted
Caused by: org.apache.cassandra.exceptions.ConfigurationException: Column family ID mismatch (found fbd275c0-7568-11e4-b9ea-3934eddce895; expected fbd24eb0-7568-11e4-bd04-b3ae3abaeff4) at org.apache.cassandra.config.CFMetaData.validateCompatility(CFMetaData.java:1254) ~[apache-cassandra-2.1.1.jar:2.1.1] at org.apache.cassandra.config.CFMetaData.apply(CFMetaData.java:1186) ~[apache-cassandra-2.1.1.jar:2.1.1] at org.apache.cassandra.config.CFMetaData.reload(CFMetaData.java:1167) ~[apache-cassandra-2.1.1.jar:2.1.1]
        ... 11 common frames omitted

with best regards
Peter

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