mongoc_read_mode_t
Read Preference Modes
Synopsis
typedef enum
{
   MONGOC_READ_PRIMARY             = (1 << 0),
   MONGOC_READ_SECONDARY           = (1 << 1),
   MONGOC_READ_PRIMARY_PREFERRED   = (1 << 2) | MONGOC_READ_PRIMARY,
   MONGOC_READ_SECONDARY_PREFERRED = (1 << 2) | MONGOC_READ_SECONDARY,
   MONGOC_READ_NEAREST             = (1 << 3) | MONGOC_READ_SECONDARY,
} mongoc_read_mode_t;Description
This enum describes how reads should be dispatched. The default is MONGOC_READ_PRIMARY.
Please see the MongoDB website for a description of Read Preferences.