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 * - number of servers if if `IsServerNode() == true`,
 * - 1 if `IsSchedulerNode() == true`,
 * \param handle handle to the KVStore
 * \param ret the group size
 * \return 0 when success, -1 when failure happens
 */
int MXKVStoreGetGroupSize(KVStoreHandle handle,
                                    int *out);

/**
 * \brief return whether or not this process is a worker node.
 * \param ret 1 for yes, 0 for no
 * \return 0 when success, -1 when failure happens
 */
int MXKVStoreIsWorkerNode(int *out);


/**
 * \brief return whether or not this process is a server node.
 * \param ret 1 for yes, 0 for no
 * \return 0 when success, -1 when failure happens
 */
int MXKVStoreIsServerNode(int *out);


/**
 * \brief return whether or not this process is a scheduler node.
 * \param ret 1 for yes, 0 for no
 * \return 0 when success, -1 when failure happens
 */
int MXKVStoreIsSchedulerNode(int *out);

/**
 * \brief global barrier among all worker machines
 *
 * \param handle handle to the KVStore
 * \return 0 when success, -1 when failure happens