round robin messags across the list.
*/
typedef struct {
+ uint64_t key; // key used to reinsert this entry into a new symtab
+ int refs; // number of symtabs which reference the entry
int mtype; // the message type for this list
int nrrgroups; // number of rr groups to send to
rrgroup_t** rrgroups; // one or more set of endpoints to round robin messages to