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                                             const char* cmd_body);

/**
 * \brief Get the number of ps dead node(s) specified by {node_id}
 *
 * \param handle handle to the KVStore
 * \param node_id Can be a node group or a single node.
 *                kScheduler = 1, kServerGroup = 2, kWorkerGroup = 4
 * \param number Ouptut number of dead nodes
 * \param timeout_sec A node fails to send heartbeart in {timeout_sec} seconds
 *                    will be presumed as 'dead'
 */
int MXKVStoreGetNumDeadNode(KVStoreHandle handle,
                                      const int node_id,
                                      int *out,
                                      const int timeout_sec = 60);

/**
 * \brief Create a RecordIO writer object
 * \param uri path to file
 * \param out handle pointer to the created object
 * \return 0 when success, -1 when failure happens
*/
int MXRecordIOWriterCreate(const char *uri, RecordIOHandle *out);

/**