apache/cassandra · warning

Prepared statement recreation error, removing statement

Error message

Prepared statement recreation error, removing statement: {} {} {}, error details: {}

What it means

During startup, QueryProcessor replays previously prepared statements persisted in system.prepared_statements and re-parses each query. If a stored query fails to re-prepare (RequestValidationException, e.g. schema drift or invalid CQL), this warning is logged, the statement is removed from the system table, and the node continues startup without it. It is self-healing: clients will re-prepare the statement on next use.

Solutions

1. Inspect the logged query/keyspace and fix the underlying schema (recreate the dropped keyspace/table or correct types) if the statement is still needed.
2. Let it self-heal: the statement is removed from system.prepared_statements and clients transparently re-prepare it; verify client applications reconnect and re-prepare.
3. If it persists after upgrade, check compatibility of the stored query with the new CQL version and have clients prepare updated queries.
4. If system.prepared_statements is corrupt, clear the offending rows (nodetool drain/stop not required; row removal is automatic) and restart.

Example fix

// before: client caches a prepared statement against a table that was dropped/recreated
// after: invalidate client prepared-statement cache on schema change and re-prepare
session.invalidatePreparedStatements();
PreparedStatement ps = session.prepare("SELECT ... FROM ks.tbl ...");

// Client-side: re-prepare on schema change and keep statement cache in sync
if (schemaChangedNotification) {
    preparedCache.clear(); // drop cached PreparedStatements after schema events
}
// Validate a query parses before persisting expectations:
// session.prepare(query) inside try/catch(InvalidQueryException) before caching

// Drivers handle this transparently: catch com.datastax.driver.core.exceptions.BootstrappingException-like
// re-prepare triggers automatically; for core usage:
try {
    PreparedStatement ps = session.prepare(query);
} catch (InvalidQueryException e) {
    log.warn("Stored prepared statement no longer valid, re-prepare with current schema", e);
}

When it happens

Trigger: Node restart with rows in system.prepared_statements whose queries no longer validate: dropped keyspaces/tables, changed types, CQL syntax no longer valid after upgrade, or corrupted rows in system.prepared_statements.

Common situations: Upgrades/downgrades across Cassandra versions where CQL validation changed; schema was dropped while the node was down; manual edits or corruption of the prepared statements table.

Understand the failure class

Background: Schema validation failed / invalid input schema: payload rejected because its shape doesn't match the expected schema — this error's family across 28 libraries.

Related errors

• Configured " " could not be found
• Configured " " was found, but had no addresses
• ERR_WRONG_DISK_STATE
• Error loading counter cache
• Error starting native transport:

AI-assisted analysis of apache/cassandra@88fd0f6a0e (2026-09-10). Data as JSON: /api/errors/45cccc61e08e09da. Report an issue: GitHub.

Appendix: source

Thrown at src/java/org/apache/cassandra/cql3/QueryProcessor.java:229

        int count = SystemKeyspace.loadPreparedStatements((id, query, keyspace) -> {
            try
            {
                ClientState clientState = ClientState.forInternalCalls();
                if (keyspace != null)
                    clientState.setKeyspace(keyspace);

                Prepared prepared = parseAndPrepare(query, clientState, false);
                preparedStatements.put(id, prepared);

                // Preload `null` statement for non-fully qualified statements, since it can't be parsed if loaded from cache and will be dropped
                if (!prepared.fullyQualified)
                    preparedStatements.get(computeId(query, null), (ignored_) -> prepared);
                return prepared;
            }
            catch (RequestValidationException e)
            {
                JVMStabilityInspector.inspectThrowable(e);
                logger.warn("Prepared statement recreation error, removing statement: {} {} {}, error details: {}", id, query, keyspace, e.getMessage());
                SystemKeyspace.removePreparedStatement(id);
                return null;
            }
        }, pageSize);
        long endTime = nanoTime();
        logger.info("Preloaded {} prepared statements in {} ms", count, TimeUnit.NANOSECONDS.toMillis(endTime - startTime));
        return count;
    }


    /**
     * Clears the prepared statement cache.
     * @param memoryOnly {@code true} if only the in memory caches must be cleared, {@code false} otherwise.
     */
    @VisibleForTesting
    public static void clearPreparedStatements(boolean memoryOnly)
    {
        preparedStatements.invalidateAll();

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