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https://issues.apache.org/jira/browse/CASSANDRA-16320?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17247102#comment-17247102
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Benjamin Lerer edited comment on CASSANDRA-16320 at 12/10/20, 9:03 AM:
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Did you run the queries that error message suggest to run:
{code}
DELETE FROM system_schema.tables WHERE keyspace_name = 'my_keyspace' AND 
table_name = 'my_materialized_view'; 
DELETE FROM system_schema.columns WHERE keyspace_name = 'my_keyspace' AND 
table_name = 'my_materialized_view';"
{code}


was (Author: blerer):
Did you run what the queries that error message suggest:
{code}
DELETE FROM system_schema.tables WHERE keyspace_name = 'my_keyspace' AND 
table_name = 'my_materialized_view'; 
DELETE FROM system_schema.columns WHERE keyspace_name = 'my_keyspace' AND 
table_name = 'my_materialized_view';"
{code}

> Cassandra fails to start after schema changed
> ---------------------------------------------
>
>                 Key: CASSANDRA-16320
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-16320
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Yazal Ulloa
>            Priority: Normal
>
> I'm using Cassandra 3.11.6 on Centos 7 with a 3 node cluster, I ran some 
> schema changes, drop tables/materialized views, alter tables, etc, after that 
> one of the materialized views was failing with this error: 
>  org.apache.cassandra.schema.SchemaKeyspace$MissingColumns: No partition key 
> columns found in schema table for my_keyspace.my_materialized_view.
>  
> I wanted to replace that materialized view with a table, with the same name 
> though, that might be why it's failing
>  
> I ran nodetool describecluster and found the schema version was different, I 
> tried to run a repair, it didn't work, I restarted the nodes, but they didn't 
> start.
> This is the error that is showing up in cassandra.log
>  
> ERROR [main] 2020-12-09 10:13:15,827 SchemaKeyspace.java:1017 - No partition 
> columns found for table my_keyspace.my_materialized_view in 
> system_schema.columns. This may be due to corruption or concurrent dropping 
> and altering of a table. If this table is supposed to be dropped, run the 
> following query to cleanup: "DELETE FROM system_schema.tables WHERE 
> keyspace_name = 'my_keyspace' AND table_name = 'my_materialized_view'; DELETE 
> FROM system_schema.columns WHERE keyspace_name = 'my_keyspace' AND table_name 
> = 'my_materialized_view';" If the table is not supposed to be dropped, 
> restore system_schema.columns sstables from backups.
>  org.apache.cassandra.schema.SchemaKeyspace$MissingColumns: No partition key 
> columns found in schema table for my_keyspace.my_materialized_view
>  at 
> org.apache.cassandra.schema.SchemaKeyspace.fetchColumns(SchemaKeyspace.java:1106)
>  [apache-cassandra-3.11.6.jar:3.11.6]
>  at 
> org.apache.cassandra.schema.SchemaKeyspace.fetchTable(SchemaKeyspace.java:1046)
>  [apache-cassandra-3.11.6.jar:3.11.6]
>  at 
> org.apache.cassandra.schema.SchemaKeyspace.fetchTables(SchemaKeyspace.java:1000)
>  [apache-cassandra-3.11.6.jar:3.11.6]
>  at 
> org.apache.cassandra.schema.SchemaKeyspace.fetchKeyspace(SchemaKeyspace.java:959)
>  [apache-cassandra-3.11.6.jar:3.11.6]
>  at 
> org.apache.cassandra.schema.SchemaKeyspace.fetchKeyspacesWithout(SchemaKeyspace.java:936)
>  [apache-cassandra-3.11.6.jar:3.11.6]
>  at 
> org.apache.cassandra.schema.SchemaKeyspace.fetchNonSystemKeyspaces(SchemaKeyspace.java:924)
>  [apache-cassandra-3.11.6.jar:3.11.6]
>  at org.apache.cassandra.config.Schema.loadFromDisk(Schema.java:92) 
> [apache-cassandra-3.11.6.jar:3.11.6]
>  at org.apache.cassandra.config.Schema.loadFromDisk(Schema.java:82) 
> [apache-cassandra-3.11.6.jar:3.11.6]
>  at 
> org.apache.cassandra.service.CassandraDaemon.setup(CassandraDaemon.java:269) 
> [apache-cassandra-3.11.6.jar:3.11.6]
>  at 
> org.apache.cassandra.service.CassandraDaemon.activate(CassandraDaemon.java:630)
>  [apache-cassandra-3.11.6.jar:3.11.6]
>  at 
> org.apache.cassandra.service.CassandraDaemon.main(CassandraDaemon.java:757) 
> [apache-cassandra-3.11.6.jar:3.11.6]
>  
> I tried starting Cassandra with 
> -Dcassandra.ignore_corrupted_schema_tables=true and it doesn't work.
>  
> Is there a way to fix this?
>  



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