HMaster.java 文件源码

@Override
public boolean registerService(Service instance) {
/*
 * No stacking of instances is allowed for a single service name
 */
    Descriptors.ServiceDescriptor serviceDesc = instance.getDescriptorForType();
    if (coprocessorServiceHandlers.containsKey(serviceDesc.getFullName())) {
        LOG.error("Coprocessor service " + serviceDesc.getFullName() +
                        " already registered, rejecting request from " + instance
        );
        return false;
    }

    coprocessorServiceHandlers.put(serviceDesc.getFullName(), instance);
    if (LOG.isDebugEnabled()) {
        LOG.debug("Registered master coprocessor service: service=" + serviceDesc.getFullName());
    }
    return true;
}