apache/shardingsphere · error · UnsupportedCommandException

Unsupported command: %s

Error message

Unsupported command: %s

What it means

Error "Unsupported command: %s" thrown in apache/shardingsphere.

Source

Thrown at proxy/frontend/dialect/mysql/src/main/java/org/apache/shardingsphere/proxy/frontend/mysql/command/generic/MySQLUnsupportedCommandExecutor.java:38

import lombok.RequiredArgsConstructor;
import org.apache.shardingsphere.database.protocol.mysql.packet.command.MySQLCommandPacketType;
import org.apache.shardingsphere.database.protocol.packet.DatabasePacket;
import org.apache.shardingsphere.proxy.frontend.command.executor.CommandExecutor;
import org.apache.shardingsphere.proxy.frontend.exception.UnsupportedCommandException;

import java.util.Collection;

/**
 * Unsupported command packet executor for MySQL.
 */
@RequiredArgsConstructor
public final class MySQLUnsupportedCommandExecutor implements CommandExecutor {
    
    private final MySQLCommandPacketType type;
    
    @Override
    public Collection<DatabasePacket> execute() {
        throw new UnsupportedCommandException(type.toString());
    }
}

View on GitHub (pinned to e952770a21)

Solutions

1. Use only MySQL commands supported by ShardingSphere-Proxy (query, prepare, execute, ping, quit, etc.).
2. Run administrative or vendor-specific commands directly against the backend database.
3. Upgrade ShardingSphere if the command is supported in a newer version.

When it happens

Trigger: The client sends a MySQL command packet type that the proxy does not implement.

Common situations: Drivers issuing commands such as COM_CHANGE_USER, COM_RESET_CONNECTION or binlog commands against the proxy.

AI-assisted analysis of apache/shardingsphere@e952770a21 (2026-08-14). Data as JSON: /api/errors/d8d0458c390b6ab5. Report an issue: GitHub.