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https://issues.apache.org/jira/browse/CASSANDRA-13739?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16112724#comment-16112724
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Aleksey Yeschenko commented on CASSANDRA-13739:
-----------------------------------------------

Seems like you have dropped a user type that some other types still depend on. 
It shouldn't happen normally because of validations, but they aren't perfect.

Have you dropped a type recently?

If not, then it might be a corruption issue, and you might have to copy over 
schema sstables from another node to the failing one.

> Cassandra can't start because of unknown type <usertype> exception
> ------------------------------------------------------------------
>
>                 Key: CASSANDRA-13739
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13739
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core, CQL
>         Environment: Development
>            Reporter: Andrey Khashchin
>             Fix For: 3.7
>
>
> OS: CentOS Linux release 7.2.1511 (Core)
> Kernel: 3.10.0-327.36.1.el7.x86_64
> Cassandra: v 3.7
> Issue:
> Cassandra is not able to start after restart of the node with following error 
> in system.log:
> ERROR [main] 2017-08-03 12:10:28,633 CassandraDaemon.java:731 - Exception 
> encountered during startup
> org.apache.cassandra.exceptions.InvalidRequestException: Unknown type <name 
> of user type>
>         at 
> org.apache.cassandra.cql3.CQL3Type$Raw$RawUT.prepare(CQL3Type.java:751) 
> ~[apache-cassandra-3.7.0.jar:3.7.0]
>         at 
> org.apache.cassandra.cql3.CQL3Type$Raw$RawCollection.prepare(CQL3Type.java:667)
>  ~[apache-cassandra-3.7.0.jar:3.7.0]
>         at 
> org.apache.cassandra.cql3.CQL3Type$Raw$RawCollection.prepareInternal(CQL3Type.java:644)
>  ~[apache-cassandra-3.7.0.jar:3.7.0]
>         at 
> org.apache.cassandra.schema.Types$RawBuilder$RawUDT.lambda$prepare$34(Types.java:313)
>  ~[apache-cassandra-3.7.0.jar:3.7.0]
>         at 
> java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193) 
> ~[na:1.8.0_102]
>         at 
> java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1374)
>  ~[na:1.8.0_102]
>         at 
> java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481) 
> ~[na:1.8.0_102]
>         at 
> java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471) 
> ~[na:1.8.0_102]
>         at 
> java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708) 
> ~[na:1.8.0_102]
>         at 
> java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) 
> ~[na:1.8.0_102]
>         at 
> java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499) 
> ~[na:1.8.0_102]
>         at 
> org.apache.cassandra.schema.Types$RawBuilder$RawUDT.prepare(Types.java:314) 
> ~[apache-cassandra-3.7.0.jar:3.7.0]
>         at org.apache.cassandra.schema.Types$RawBuilder.build(Types.java:263) 
> ~[apache-cassandra-3.7.0.jar:3.7.0]
>         at 
> org.apache.cassandra.schema.SchemaKeyspace.fetchTypes(SchemaKeyspace.java:920)
>  ~[apache-cassandra-3.7.0.jar:3.7.0]
>         at 
> org.apache.cassandra.schema.SchemaKeyspace.fetchKeyspace(SchemaKeyspace.java:891)
>  ~[apache-cassandra-3.7.0.jar:3.7.0]
>         at 
> org.apache.cassandra.schema.SchemaKeyspace.fetchKeyspacesWithout(SchemaKeyspace.java:869)
>  ~[apache-cassandra-3.7.0.jar:3.7.0]
>         at 
> org.apache.cassandra.schema.SchemaKeyspace.fetchNonSystemKeyspaces(SchemaKeyspace.java:857)
>  ~[apache-cassandra-3.7.0.jar:3.7.0]
>         at org.apache.cassandra.config.Schema.loadFromDisk(Schema.java:136) 
> ~[apache-cassandra-3.7.0.jar:3.7.0]
>         at org.apache.cassandra.config.Schema.loadFromDisk(Schema.java:126) 
> ~[apache-cassandra-3.7.0.jar:3.7.0]
>         at 
> org.apache.cassandra.service.CassandraDaemon.setup(CassandraDaemon.java:251) 
> [apache-cassandra-3.7.0.jar:3.7.0]
>         at 
> org.apache.cassandra.service.CassandraDaemon.activate(CassandraDaemon.java:585)
>  [apache-cassandra-3.7.0.jar:3.7.0]
>         at 
> org.apache.cassandra.service.CassandraDaemon.main(CassandraDaemon.java:714) 
> [apache-cassandra-3.7.0.jar:3.7.0]
> Thank you for your help!



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