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https://issues.apache.org/jira/browse/CASSANDRA-10996?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sylvain Lebresne resolved CASSANDRA-10996.
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Resolution: Not A Problem
To refer to the "upgrading" section of the {{NEWS}} file for 3.0 (which I
strongly advise reading carefully for any upgrade but even more so for major
upgrades):
{noformat}
- Schema metadata is now stored in the new `system_schema` keyspace, and
legacy `system.schema_*` tables are now gone; see CASSANDRA-6717 for
details.
{noformat}
So you'd have to adapt your code to use the new tables. That said, I'd
recommend relying on drivers metadata APIs (for instance
[KeyspaceMetadata|http://docs.datastax.com/en/drivers/java/2.1/com/datastax/driver/core/KeyspaceMetadata.html]
and related classes for the java driver) to access schema information (instead
of directly querying the system tables) as this will isolate you from such
changes.
> The system table system.schema_columnfamilies does not exist
> -------------------------------------------------------------
>
> Key: CASSANDRA-10996
> URL: https://issues.apache.org/jira/browse/CASSANDRA-10996
> Project: Cassandra
> Issue Type: Bug
> Components: CQL
> Reporter: sangshenghong
> Priority: Critical
> Fix For: 3.1.1
>
> Attachments: error.png
>
>
> In the 2.1.6 version,there is one system table named
> "system.schema_columnfamilies", but in the latest version 3.1.1, when I
> execute select * from system.schema_columnfamilies, it throw "unconfigured
> table schema_columnfamilies" in cqlsh.
> But in the system.log file, it show
> ColumnFamilyStore.java:381 - Initializing system.schema_columnfamilies
> I checked the doc and found some tables and schemas have been change, so I
> want to know if there any change for this?
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