apache/cassandra · info

Table . (id: ) no longer exists. It may have been dropped.

Error message

Table {}.{} (id: {}) no longer exists. It may have been dropped.

What it means

In AccordDebugKeyspace, when rendering a virtual-table row for a TableMigrationState, the table's id can no longer be resolved from Schema. The code logs a warning 'Table {ks}.{table} (id: {}) no longer exists. It may have been dropped.' and skips the row instead of failing. It reflects a race between schema drops and migration-state bookkeeping.

Solutions

1. Verify the table actually exists: run DESC TABLE or query system_schema.tables for the keyspace/table named in the warning.
2. Re-run the virtual table query after the migration state is cleaned up; the stale entry is skipped harmlessly.
3. If the table should exist, restore it from schema or recreate it; ensure the drop was intentional.

// verify table existence before relying on Accord debug output
String ks = state.keyspaceName, tbl = state.tableName;
boolean exists = session.execute("SELECT keyspace_name FROM system_schema.tables WHERE keyspace_name=? AND table_name=?", ks, tbl).iterator().hasNext();

When it happens

Trigger: SELECT from the Accord debug virtual tables while a table that was being migrated to Accord (or tracked in tableStates) is dropped concurrently; listing migration states after a DROP TABLE removed the schema entry.

Common situations: Debugging Accord migrations on a schema where tables were dropped; racing DROP TABLE with virtual-table queries; stale TableMigrationState entries after schema churn.

Understand the failure class

Background: "Not found" and "does not exist" errors: why "Task not found", "No such folder", and "Can't find" fire when a lookup comes back empty — this error's family across 14 libraries.

Related errors

• Accord transaction uses dropped tables
• Can only unset '" + name + "'
• Cannot create table . with transactional mode with…
• Cannot drop keyspace
• Cannot drop keyspace

AI-assisted analysis of apache/cassandra@88fd0f6a0e (2026-09-10). Data as JSON: /api/errors/09406de0ecaa0fbf. Report an issue: GitHub.

Appendix: source

Thrown at src/java/org/apache/cassandra/db/virtual/AccordDebugKeyspace.java:918

                                             .collect(Collectors.toList());

            ConsensusMigrationState snapshot = ClusterMetadata.current().consensusMigrationState;
            Collection<TableMigrationState> tableStates = snapshot.tableStatesFor(tableIDs);

            return data(tableStates);
        }

        private SimpleDataSet data(Collection<TableMigrationState> tableStates)
        {
            SimpleDataSet result = new SimpleDataSet(metadata());

            for (TableMigrationState state : tableStates)
            {
                TableMetadata table = Schema.instance.getTableMetadata(state.tableId);

                if (table == null)
                {
                    logger.warn("Table {}.{} (id: {}) no longer exists. It may have been dropped.",
                                state.keyspaceName, state.tableName, state.tableId);
                    continue;
                }

                result.row(state.keyspaceName, state.tableName);
                result.column("table_id", state.tableId.asUUID());
                result.column("target_protocol", state.targetProtocol.toString());
                result.column("transactional_mode", table.params.transactionalMode.toString());
                result.column("transactional_migration_from", table.params.transactionalMode.toString());

                List<String> primitiveMigratedRanges = state.migratedRanges.stream().map(Objects::toString).collect(toImmutableList());
                result.column("migrated_ranges", primitiveMigratedRanges);

                List<String> primitiveRepairPendingRanges = state.repairPendingRanges.stream().map(Objects::toString).collect(toImmutableList());
                result.column("repair_pending_ranges", primitiveRepairPendingRanges);
        
                Map<Long, List<String>> primitiveRangesByEpoch = new LinkedHashMap<>();
                for (Map.Entry<org.apache.cassandra.tcm.Epoch, NormalizedRanges<Token>> entry : state.migratingRangesByEpoch.entrySet())

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